From be32796bea250da5f284d4c6b6dbde9dba81ac9e Mon Sep 17 00:00:00 2001
From: ajurna <Wn$OtwL1u6Fl>
Date: Wed, 20 May 2020 10:26:45 +0100
Subject: [PATCH] New reader based on reveal.js. works well on mobile and
 desktop and gives a better expierance all around.

---
 comic/models.py                               |   10 +-
 comic/templates/base.html                     |   12 +-
 comic/templates/comic/read_comic.html         |  138 +-
 comic/urls.py                                 |    4 +-
 comic/util.py                                 |    2 +-
 comic/views.py                                |   41 +-
 static/js/hammer.js                           | 2643 +++++++
 static/js/hammer.min.js                       |    7 +
 static/js/hammer.min.js.map                   |    1 +
 static/js/hammer.min.map                      |    1 +
 static/reveal.js/LICENSE                      |   19 +
 static/reveal.js/css/print/paper.css          |  203 +
 static/reveal.js/css/print/pdf.css            |  164 +
 static/reveal.js/css/reset.css                |   30 +
 static/reveal.js/css/reveal.css               | 1606 +++++
 static/reveal.js/css/reveal.scss              | 1777 +++++
 static/reveal.js/css/theme/README.md          |   21 +
 static/reveal.js/css/theme/beige.css          |  277 +
 static/reveal.js/css/theme/black.css          |  273 +
 static/reveal.js/css/theme/blood.css          |  296 +
 static/reveal.js/css/theme/league.css         |  279 +
 static/reveal.js/css/theme/moon.css           |  277 +
 static/reveal.js/css/theme/night.css          |  271 +
 static/reveal.js/css/theme/serif.css          |  273 +
 static/reveal.js/css/theme/simple.css         |  276 +
 static/reveal.js/css/theme/sky.css            |  280 +
 static/reveal.js/css/theme/solarized.css      |  277 +
 static/reveal.js/css/theme/source/beige.scss  |   39 +
 static/reveal.js/css/theme/source/black.scss  |   49 +
 static/reveal.js/css/theme/source/blood.scss  |   78 +
 static/reveal.js/css/theme/source/league.scss |   34 +
 static/reveal.js/css/theme/source/moon.scss   |   57 +
 static/reveal.js/css/theme/source/night.scss  |   34 +
 static/reveal.js/css/theme/source/serif.scss  |   35 +
 static/reveal.js/css/theme/source/simple.scss |   43 +
 static/reveal.js/css/theme/source/sky.scss    |   46 +
 .../reveal.js/css/theme/source/solarized.scss |   63 +
 static/reveal.js/css/theme/source/white.scss  |   49 +
 .../reveal.js/css/theme/template/mixins.scss  |   29 +
 .../css/theme/template/settings.scss          |   45 +
 .../reveal.js/css/theme/template/theme.scss   |  325 +
 static/reveal.js/css/theme/white.css          |  273 +
 static/reveal.js/js/reveal.js                 | 6191 +++++++++++++++++
 43 files changed, 16776 insertions(+), 72 deletions(-)
 create mode 100644 static/js/hammer.js
 create mode 100644 static/js/hammer.min.js
 create mode 100644 static/js/hammer.min.js.map
 create mode 100644 static/js/hammer.min.map
 create mode 100644 static/reveal.js/LICENSE
 create mode 100644 static/reveal.js/css/print/paper.css
 create mode 100644 static/reveal.js/css/print/pdf.css
 create mode 100644 static/reveal.js/css/reset.css
 create mode 100644 static/reveal.js/css/reveal.css
 create mode 100644 static/reveal.js/css/reveal.scss
 create mode 100644 static/reveal.js/css/theme/README.md
 create mode 100644 static/reveal.js/css/theme/beige.css
 create mode 100644 static/reveal.js/css/theme/black.css
 create mode 100644 static/reveal.js/css/theme/blood.css
 create mode 100644 static/reveal.js/css/theme/league.css
 create mode 100644 static/reveal.js/css/theme/moon.css
 create mode 100644 static/reveal.js/css/theme/night.css
 create mode 100644 static/reveal.js/css/theme/serif.css
 create mode 100644 static/reveal.js/css/theme/simple.css
 create mode 100644 static/reveal.js/css/theme/sky.css
 create mode 100644 static/reveal.js/css/theme/solarized.css
 create mode 100644 static/reveal.js/css/theme/source/beige.scss
 create mode 100644 static/reveal.js/css/theme/source/black.scss
 create mode 100644 static/reveal.js/css/theme/source/blood.scss
 create mode 100644 static/reveal.js/css/theme/source/league.scss
 create mode 100644 static/reveal.js/css/theme/source/moon.scss
 create mode 100644 static/reveal.js/css/theme/source/night.scss
 create mode 100644 static/reveal.js/css/theme/source/serif.scss
 create mode 100644 static/reveal.js/css/theme/source/simple.scss
 create mode 100644 static/reveal.js/css/theme/source/sky.scss
 create mode 100644 static/reveal.js/css/theme/source/solarized.scss
 create mode 100644 static/reveal.js/css/theme/source/white.scss
 create mode 100644 static/reveal.js/css/theme/template/mixins.scss
 create mode 100644 static/reveal.js/css/theme/template/settings.scss
 create mode 100644 static/reveal.js/css/theme/template/theme.scss
 create mode 100644 static/reveal.js/css/theme/white.css
 create mode 100644 static/reveal.js/js/reveal.js

diff --git a/comic/models.py b/comic/models.py
index e327c7b..eadca5c 100644
--- a/comic/models.py
+++ b/comic/models.py
@@ -131,13 +131,9 @@ class ComicBook(models.Model):
             out.prev_index = page - 1
             out.prev_path = out.cur_path
 
-        if self.is_last_page(page):
-            out.next_path, out.next_index = self.nav_get_next_comic(user)
-            if out.next_index == -1:
-                out.q_next_to_directory = True
-        else:
-            out.next_index = page + 1
-            out.next_path = out.cur_path
+        out.next_path, out.next_index = self.nav_get_next_comic(user)
+        if out.next_index == -1:
+            out.q_next_to_directory = True
         return out
 
     def nav_get_prev_comic(self, user):
diff --git a/comic/templates/base.html b/comic/templates/base.html
index 6e5fb3d..f6a1b57 100644
--- a/comic/templates/base.html
+++ b/comic/templates/base.html
@@ -20,6 +20,9 @@
     <link href="{% static "css/base.css" %}" rel="stylesheet">
     <link href="{% static "font-awesome/css/all.css" %}" rel="stylesheet">
 
+{#    <link href="{% static "reveal.js/css/reveal.css" %}" rel="stylesheet">#}
+{#    <link href="{% static "reveal.js/css/theme/white.css" %}" rel="stylesheet">#}
+
 
   </head>
 
@@ -51,9 +54,9 @@
 
 
     <!-- /.container -->
-    <footer class="footer">
-      <div class="container centered">
-        <center><a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/InteractiveResource" property="dct:title" rel="dct:type">CBReader</span> by <span xmlns:cc="http://creativecommons.org/ns#" property="cc:attributionName">Ajurna</span> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.<br />Based on a work at <a xmlns:dct="http://purl.org/dc/terms/" href="https://github.com/ajurna/cbreader" rel="dct:source">https://github.com/ajurna/cbreader</a>.</center>
+    <footer class="footer mt-auto py-3">
+      <div class="container text-center">
+        <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/InteractiveResource" property="dct:title" rel="dct:type">CBReader</span> by <span xmlns:cc="http://creativecommons.org/ns#" property="cc:attributionName">Ajurna</span> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.<br />Based on a work at <a xmlns:dct="http://purl.org/dc/terms/" href="https://github.com/ajurna/cbreader" rel="dct:source">https://github.com/ajurna/cbreader</a>.
       </div>
     </footer>
 
@@ -63,6 +66,9 @@
     {% bootstrap_javascript jquery='full' %}
     <script type="text/javascript" src="https://cdn.datatables.net/v/bs4/dt-1.10.21/b-1.6.2/b-colvis-1.6.2/r-2.2.4/datatables.min.js"></script>
     <script type="text/javascript" src="{% static "js/js.cookie.js" %}"></script>
+    <script type="text/javascript" src="{% static "reveal.js/js/reveal.js" %}"></script>
+    <script type="text/javascript" src="{% static "js/hammer.min.js" %}"></script>
+
  {% block script %}
  {% endblock %}
   </body>
diff --git a/comic/templates/comic/read_comic.html b/comic/templates/comic/read_comic.html
index 842958d..b9f2d29 100644
--- a/comic/templates/comic/read_comic.html
+++ b/comic/templates/comic/read_comic.html
@@ -2,47 +2,99 @@
 {% block title %}{{ title }}{% endblock %}
 
 {% block content %}
-<div class="container comic_box justify-content-center">
-    <div class="row justify-content-center">
-        {% if nav.q_next_to_directory %}
-            <a href="/comic/{{ nav.next_path }}/">
-        {% else %}
-            <a href="/comic/read/{{ nav.next_path }}/{{ nav.next_index }}/">
-        {% endif %}
-            <img src="/comic/read/{{ nav.cur_path }}/{{ nav.cur_index }}/img" class="img-fluid">
-        </a>
-    </div>
-    <div class="row justify-content-center mt-1 mb-1">
-        <div class="btn-group" role="group" aria-label="Navigation">
-            {% if nav.q_prev_to_directory %}
-                {% if nav.prev_path %}
-                    <a href="/comic/{{ nav.prev_path }}/" class="btn btn-secondary">Prev</a>
-                {% else %}
-                    <a href="/comic/" class="btn btn-secondary">Prev</a>
-                {% endif %}
-            {% else %}
-                <a href="/comic/read/{{ nav.prev_path }}/{{ nav.prev_index }}/" class="btn btn-secondary">Prev</a>
-            {% endif %}
-            <div class="btn-group" role="group">
-                <button id="page_list" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-                  {{ orig_file_name }}
-                </button>
-                <div class="dropdown-menu" aria-labelledby="page_list">
-                    {% for file in book.pages %}
-                        <a class="dropdown-item" href="/comic/read/{{ nav.cur_path }}/{{ file.index }}/">{{ file.page_file_name }}</a>
-                    {% endfor %}
-                </div>
-            </div>
-            {% if nav.q_next_to_directory %}
-                {% if nav.next_path %}
-                    <a href="/comic/{{ nav.next_path }}/" class="btn btn-secondary">Next</a>
-                {% else %}
-                    <a href="/comic/" class="btn btn-secondary">Next</a>
-                {% endif %}
-            {% else %}
-                <a href="/comic/read/{{ nav.next_path }}/{{ nav.next_index }}/" class="btn btn-secondary">Next</a>
-            {% endif %}
-        </div>
-    </div>
-</div>
+
+
+        <div class="reveal" id="comic_box">
+			<div class="slides">
+                {% for page in pages %}
+				<section><img data-src="{% url "get_image" nav.cur_path page.index %}" class=" w-100" onclick="Reveal.next()"></section>
+                {% endfor %}
+			</div>
+		</div>
+
+{% endblock %}
+
+{% block script %}
+    <script>
+        Reveal.initialize({
+            controls: false,
+            hash: true,
+            width: "100%",
+            height: "100%",
+            margin: 0,
+            minScale: 1,
+            maxScale: 1,
+            disableLayout: true,
+            keyboard: false,
+            touch: false,
+            transition: 'slide',
+        });
+        Reveal.setState({indexh: {{ status.last_read_page }} });
+        Reveal.addEventListener( 'slidechanged', function( event ) {
+            // event.previousSlide, event.currentSlide, event.indexh, event.indexv
+            document.getElementsByClassName('present')[0].scrollIntoView({behavior: 'smooth'})
+            $.ajax({url: "/comic/set_page/{{nav.cur_path}}/" + event.indexh + "/"})
+        } );
+        $(document).keydown(function(e) {
+            switch(e.which) {
+                case 37: // left
+                    if (Reveal.isFirstSlide()){
+                        window.location = "{% url "read_comic" nav.prev_path %}"
+                    } else {
+                        Reveal.prev();
+                    }
+                break;
+
+                case 38: // up
+                    window.scrollTo({
+                      top: window.scrollY-window.innerHeight*.7,
+                      left: 0,
+                      behavior: 'smooth'
+                    });
+                break;
+
+                case 39: // right
+                    if (Reveal.isLastSlide()){
+                        window.location = "{% url "read_comic" nav.next_path %}"
+                    } else {
+                        Reveal.next()
+                    }
+                break;
+
+                case 40: // down
+                    window.scrollTo({
+                      top: window.scrollY+window.innerHeight*.7,
+                      left: 0,
+                      behavior: 'smooth'
+                    });
+                break;
+
+                default: return; // exit this handler for other keys
+            }
+            e.preventDefault(); // prevent the default action (scroll / move caret)
+        });
+
+        var hammertime = new Hammer(document.getElementById('comic_box'), {});
+        hammertime.on('swipeleft', function (ev) {
+            if (Reveal.isLastSlide()){
+                window.location = "{% url "read_comic" nav.next_path %}"
+            } else {
+                Reveal.next()
+            }
+        })
+        hammertime.on('swiperight', function (ev) {
+            if (Reveal.isFirstSlide()){
+                window.location = "{% url "read_comic" nav.prev_path %}"
+            } else {
+                Reveal.prev();
+            }
+        })
+        hammertime.on('tap', function (ev) {
+            if (Reveal.isLastSlide()){
+                window.location = "{% url "read_comic" nav.next_path %}"
+            } else {
+                Reveal.next()
+            }
+        })
+    </script>
 {% endblock %}
\ No newline at end of file
diff --git a/comic/urls.py b/comic/urls.py
index cc6675c..c304c45 100644
--- a/comic/urls.py
+++ b/comic/urls.py
@@ -1,4 +1,5 @@
 from django.conf.urls import url
+from django.urls import path
 
 from . import feeds, views
 
@@ -9,7 +10,8 @@ urlpatterns = [
     url(r"^settings/users/(?P<user_id>[0-9]+)/$", views.user_config_page, name="user_details"),
     url(r"^settings/users/add/$", views.user_add_page, name="add_users"),
     url(r"^account/$", views.account_page, name="account"),
-    url(r"^read/(?P<comic_selector>[\w-]+)/(?P<page>[0-9]+)/$", views.read_comic, name="read_comic"),
+    url(r"^read/(?P<comic_selector>[\w-]+)/$", views.read_comic, name="read_comic"),
+    url(r"^set_page/(?P<comic_selector>[\w-]+)/(?P<page>[0-9]+)/$", views.set_read_page, name="set_read_page"),
     url(r"^read/(?P<comic_selector>[\w-]+)/(?P<page>[0-9]+)/img$", views.get_image, name="get_image"),
     url(r"^list_json/$", views.comic_list_json, name="comic_list_json1"),
     url(r"^list_json/(?P<directory_selector>[\w-]+)/$", views.comic_list_json, name="comic_list_json2"),
diff --git a/comic/util.py b/comic/util.py
index ae092d4..522938a 100644
--- a/comic/util.py
+++ b/comic/util.py
@@ -112,7 +112,7 @@ class DirFile:
             if created:
                 status.save()
             self.selector = urlsafe_base64_encode(comic.selector.bytes)
-            self.location = "/comic/read/{0}/{1}/".format(self.selector, status.last_read_page)
+            self.location = "/comic/read/{0}/".format(self.selector)
             self.label = generate_label(comic, status)
             self.type = "book"
 
diff --git a/comic/views.py b/comic/views.py
index d642d1f..88b88cf 100644
--- a/comic/views.py
+++ b/comic/views.py
@@ -140,9 +140,7 @@ def recent_comics_json(request):
                 "name": book.file_name,
                 "date": book.date_added.strftime("%d/%m/%y-%H:%M"),
                 "label": generate_label(book, status),
-                "url": "/comic/read/{0}/{1}/".format(
-                    urlsafe_base64_encode(book.selector.bytes), status.last_read_page
-                ),
+                "url": "/comic/read/{0}/".format(urlsafe_base64_encode(book.selector.bytes)),
             }
         )
     return HttpResponse(json.dumps(response_data), content_type="application/json")
@@ -293,13 +291,31 @@ def settings_page(request):
 
 
 @login_required
-def read_comic(request, comic_selector, page):
+def read_comic(request, comic_selector):
+    selector = uuid.UUID(bytes=urlsafe_base64_decode(comic_selector))
+    book = get_object_or_404(ComicBook, selector=selector)
+    pages = ComicPage.objects.filter(Comic=book)
+
+    status, _ = ComicStatus.objects.get_or_create(comic=book, user=request.user)
+    title = "CBWebReader - " + book.file_name
+    context = {
+        "book": book,
+        "pages": pages,
+        # "orig_file_name": book.page_name(page),
+        "nav": book.nav(0, request.user),
+        "status": status,
+        "breadcrumbs": generate_breadcrumbs_from_path(book.directory, book),
+        "menu": Menu(request.user),
+        "title": title,
+    }
+    return render(request, "comic/read_comic.html", context)
+
+
+@login_required
+def set_read_page(request, comic_selector, page):
     page = int(page)
     selector = uuid.UUID(bytes=urlsafe_base64_decode(comic_selector))
     book = get_object_or_404(ComicBook, selector=selector)
-
-    breadcrumbs = generate_breadcrumbs_from_path(book.directory, book)
-
     status, _ = ComicStatus.objects.get_or_create(comic=book, user=request.user)
     status.unread = False
     status.last_read_page = page
@@ -308,16 +324,7 @@ def read_comic(request, comic_selector, page):
     else:
         status.finished = False
     status.save()
-    title = "CBWebReader - " + book.file_name + " - Page: " + str(page)
-    context = {
-        "book": book,
-        "orig_file_name": book.page_name(page),
-        "nav": book.nav(page, request.user),
-        "breadcrumbs": breadcrumbs,
-        "menu": Menu(request.user),
-        "title": title,
-    }
-    return render(request, "comic/read_comic.html", context)
+    return HttpResponse(status=200)
 
 
 @login_required
diff --git a/static/js/hammer.js b/static/js/hammer.js
new file mode 100644
index 0000000..2b64009
--- /dev/null
+++ b/static/js/hammer.js
@@ -0,0 +1,2643 @@
+/*! Hammer.JS - v2.0.7 - 2016-04-22
+ * http://hammerjs.github.io/
+ *
+ * Copyright (c) 2016 Jorik Tangelder;
+ * Licensed under the MIT license */
+(function(window, document, exportName, undefined) {
+  'use strict';
+
+var VENDOR_PREFIXES = ['', 'webkit', 'Moz', 'MS', 'ms', 'o'];
+var TEST_ELEMENT = document.createElement('div');
+
+var TYPE_FUNCTION = 'function';
+
+var round = Math.round;
+var abs = Math.abs;
+var now = Date.now;
+
+/**
+ * set a timeout with a given scope
+ * @param {Function} fn
+ * @param {Number} timeout
+ * @param {Object} context
+ * @returns {number}
+ */
+function setTimeoutContext(fn, timeout, context) {
+    return setTimeout(bindFn(fn, context), timeout);
+}
+
+/**
+ * if the argument is an array, we want to execute the fn on each entry
+ * if it aint an array we don't want to do a thing.
+ * this is used by all the methods that accept a single and array argument.
+ * @param {*|Array} arg
+ * @param {String} fn
+ * @param {Object} [context]
+ * @returns {Boolean}
+ */
+function invokeArrayArg(arg, fn, context) {
+    if (Array.isArray(arg)) {
+        each(arg, context[fn], context);
+        return true;
+    }
+    return false;
+}
+
+/**
+ * walk objects and arrays
+ * @param {Object} obj
+ * @param {Function} iterator
+ * @param {Object} context
+ */
+function each(obj, iterator, context) {
+    var i;
+
+    if (!obj) {
+        return;
+    }
+
+    if (obj.forEach) {
+        obj.forEach(iterator, context);
+    } else if (obj.length !== undefined) {
+        i = 0;
+        while (i < obj.length) {
+            iterator.call(context, obj[i], i, obj);
+            i++;
+        }
+    } else {
+        for (i in obj) {
+            obj.hasOwnProperty(i) && iterator.call(context, obj[i], i, obj);
+        }
+    }
+}
+
+/**
+ * wrap a method with a deprecation warning and stack trace
+ * @param {Function} method
+ * @param {String} name
+ * @param {String} message
+ * @returns {Function} A new function wrapping the supplied method.
+ */
+function deprecate(method, name, message) {
+    var deprecationMessage = 'DEPRECATED METHOD: ' + name + '\n' + message + ' AT \n';
+    return function() {
+        var e = new Error('get-stack-trace');
+        var stack = e && e.stack ? e.stack.replace(/^[^\(]+?[\n$]/gm, '')
+            .replace(/^\s+at\s+/gm, '')
+            .replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@') : 'Unknown Stack Trace';
+
+        var log = window.console && (window.console.warn || window.console.log);
+        if (log) {
+            log.call(window.console, deprecationMessage, stack);
+        }
+        return method.apply(this, arguments);
+    };
+}
+
+/**
+ * extend object.
+ * means that properties in dest will be overwritten by the ones in src.
+ * @param {Object} target
+ * @param {...Object} objects_to_assign
+ * @returns {Object} target
+ */
+var assign;
+if (typeof Object.assign !== 'function') {
+    assign = function assign(target) {
+        if (target === undefined || target === null) {
+            throw new TypeError('Cannot convert undefined or null to object');
+        }
+
+        var output = Object(target);
+        for (var index = 1; index < arguments.length; index++) {
+            var source = arguments[index];
+            if (source !== undefined && source !== null) {
+                for (var nextKey in source) {
+                    if (source.hasOwnProperty(nextKey)) {
+                        output[nextKey] = source[nextKey];
+                    }
+                }
+            }
+        }
+        return output;
+    };
+} else {
+    assign = Object.assign;
+}
+
+/**
+ * extend object.
+ * means that properties in dest will be overwritten by the ones in src.
+ * @param {Object} dest
+ * @param {Object} src
+ * @param {Boolean} [merge=false]
+ * @returns {Object} dest
+ */
+var extend = deprecate(function extend(dest, src, merge) {
+    var keys = Object.keys(src);
+    var i = 0;
+    while (i < keys.length) {
+        if (!merge || (merge && dest[keys[i]] === undefined)) {
+            dest[keys[i]] = src[keys[i]];
+        }
+        i++;
+    }
+    return dest;
+}, 'extend', 'Use `assign`.');
+
+/**
+ * merge the values from src in the dest.
+ * means that properties that exist in dest will not be overwritten by src
+ * @param {Object} dest
+ * @param {Object} src
+ * @returns {Object} dest
+ */
+var merge = deprecate(function merge(dest, src) {
+    return extend(dest, src, true);
+}, 'merge', 'Use `assign`.');
+
+/**
+ * simple class inheritance
+ * @param {Function} child
+ * @param {Function} base
+ * @param {Object} [properties]
+ */
+function inherit(child, base, properties) {
+    var baseP = base.prototype,
+        childP;
+
+    childP = child.prototype = Object.create(baseP);
+    childP.constructor = child;
+    childP._super = baseP;
+
+    if (properties) {
+        assign(childP, properties);
+    }
+}
+
+/**
+ * simple function bind
+ * @param {Function} fn
+ * @param {Object} context
+ * @returns {Function}
+ */
+function bindFn(fn, context) {
+    return function boundFn() {
+        return fn.apply(context, arguments);
+    };
+}
+
+/**
+ * let a boolean value also be a function that must return a boolean
+ * this first item in args will be used as the context
+ * @param {Boolean|Function} val
+ * @param {Array} [args]
+ * @returns {Boolean}
+ */
+function boolOrFn(val, args) {
+    if (typeof val == TYPE_FUNCTION) {
+        return val.apply(args ? args[0] || undefined : undefined, args);
+    }
+    return val;
+}
+
+/**
+ * use the val2 when val1 is undefined
+ * @param {*} val1
+ * @param {*} val2
+ * @returns {*}
+ */
+function ifUndefined(val1, val2) {
+    return (val1 === undefined) ? val2 : val1;
+}
+
+/**
+ * addEventListener with multiple events at once
+ * @param {EventTarget} target
+ * @param {String} types
+ * @param {Function} handler
+ */
+function addEventListeners(target, types, handler) {
+    each(splitStr(types), function(type) {
+        target.addEventListener(type, handler, false);
+    });
+}
+
+/**
+ * removeEventListener with multiple events at once
+ * @param {EventTarget} target
+ * @param {String} types
+ * @param {Function} handler
+ */
+function removeEventListeners(target, types, handler) {
+    each(splitStr(types), function(type) {
+        target.removeEventListener(type, handler, false);
+    });
+}
+
+/**
+ * find if a node is in the given parent
+ * @method hasParent
+ * @param {HTMLElement} node
+ * @param {HTMLElement} parent
+ * @return {Boolean} found
+ */
+function hasParent(node, parent) {
+    while (node) {
+        if (node == parent) {
+            return true;
+        }
+        node = node.parentNode;
+    }
+    return false;
+}
+
+/**
+ * small indexOf wrapper
+ * @param {String} str
+ * @param {String} find
+ * @returns {Boolean} found
+ */
+function inStr(str, find) {
+    return str.indexOf(find) > -1;
+}
+
+/**
+ * split string on whitespace
+ * @param {String} str
+ * @returns {Array} words
+ */
+function splitStr(str) {
+    return str.trim().split(/\s+/g);
+}
+
+/**
+ * find if a array contains the object using indexOf or a simple polyFill
+ * @param {Array} src
+ * @param {String} find
+ * @param {String} [findByKey]
+ * @return {Boolean|Number} false when not found, or the index
+ */
+function inArray(src, find, findByKey) {
+    if (src.indexOf && !findByKey) {
+        return src.indexOf(find);
+    } else {
+        var i = 0;
+        while (i < src.length) {
+            if ((findByKey && src[i][findByKey] == find) || (!findByKey && src[i] === find)) {
+                return i;
+            }
+            i++;
+        }
+        return -1;
+    }
+}
+
+/**
+ * convert array-like objects to real arrays
+ * @param {Object} obj
+ * @returns {Array}
+ */
+function toArray(obj) {
+    return Array.prototype.slice.call(obj, 0);
+}
+
+/**
+ * unique array with objects based on a key (like 'id') or just by the array's value
+ * @param {Array} src [{id:1},{id:2},{id:1}]
+ * @param {String} [key]
+ * @param {Boolean} [sort=False]
+ * @returns {Array} [{id:1},{id:2}]
+ */
+function uniqueArray(src, key, sort) {
+    var results = [];
+    var values = [];
+    var i = 0;
+
+    while (i < src.length) {
+        var val = key ? src[i][key] : src[i];
+        if (inArray(values, val) < 0) {
+            results.push(src[i]);
+        }
+        values[i] = val;
+        i++;
+    }
+
+    if (sort) {
+        if (!key) {
+            results = results.sort();
+        } else {
+            results = results.sort(function sortUniqueArray(a, b) {
+                return a[key] > b[key];
+            });
+        }
+    }
+
+    return results;
+}
+
+/**
+ * get the prefixed property
+ * @param {Object} obj
+ * @param {String} property
+ * @returns {String|Undefined} prefixed
+ */
+function prefixed(obj, property) {
+    var prefix, prop;
+    var camelProp = property[0].toUpperCase() + property.slice(1);
+
+    var i = 0;
+    while (i < VENDOR_PREFIXES.length) {
+        prefix = VENDOR_PREFIXES[i];
+        prop = (prefix) ? prefix + camelProp : property;
+
+        if (prop in obj) {
+            return prop;
+        }
+        i++;
+    }
+    return undefined;
+}
+
+/**
+ * get a unique id
+ * @returns {number} uniqueId
+ */
+var _uniqueId = 1;
+function uniqueId() {
+    return _uniqueId++;
+}
+
+/**
+ * get the window object of an element
+ * @param {HTMLElement} element
+ * @returns {DocumentView|Window}
+ */
+function getWindowForElement(element) {
+    var doc = element.ownerDocument || element;
+    return (doc.defaultView || doc.parentWindow || window);
+}
+
+var MOBILE_REGEX = /mobile|tablet|ip(ad|hone|od)|android/i;
+
+var SUPPORT_TOUCH = ('ontouchstart' in window);
+var SUPPORT_POINTER_EVENTS = prefixed(window, 'PointerEvent') !== undefined;
+var SUPPORT_ONLY_TOUCH = SUPPORT_TOUCH && MOBILE_REGEX.test(navigator.userAgent);
+
+var INPUT_TYPE_TOUCH = 'touch';
+var INPUT_TYPE_PEN = 'pen';
+var INPUT_TYPE_MOUSE = 'mouse';
+var INPUT_TYPE_KINECT = 'kinect';
+
+var COMPUTE_INTERVAL = 25;
+
+var INPUT_START = 1;
+var INPUT_MOVE = 2;
+var INPUT_END = 4;
+var INPUT_CANCEL = 8;
+
+var DIRECTION_NONE = 1;
+var DIRECTION_LEFT = 2;
+var DIRECTION_RIGHT = 4;
+var DIRECTION_UP = 8;
+var DIRECTION_DOWN = 16;
+
+var DIRECTION_HORIZONTAL = DIRECTION_LEFT | DIRECTION_RIGHT;
+var DIRECTION_VERTICAL = DIRECTION_UP | DIRECTION_DOWN;
+var DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;
+
+var PROPS_XY = ['x', 'y'];
+var PROPS_CLIENT_XY = ['clientX', 'clientY'];
+
+/**
+ * create new input type manager
+ * @param {Manager} manager
+ * @param {Function} callback
+ * @returns {Input}
+ * @constructor
+ */
+function Input(manager, callback) {
+    var self = this;
+    this.manager = manager;
+    this.callback = callback;
+    this.element = manager.element;
+    this.target = manager.options.inputTarget;
+
+    // smaller wrapper around the handler, for the scope and the enabled state of the manager,
+    // so when disabled the input events are completely bypassed.
+    this.domHandler = function(ev) {
+        if (boolOrFn(manager.options.enable, [manager])) {
+            self.handler(ev);
+        }
+    };
+
+    this.init();
+
+}
+
+Input.prototype = {
+    /**
+     * should handle the inputEvent data and trigger the callback
+     * @virtual
+     */
+    handler: function() { },
+
+    /**
+     * bind the events
+     */
+    init: function() {
+        this.evEl && addEventListeners(this.element, this.evEl, this.domHandler);
+        this.evTarget && addEventListeners(this.target, this.evTarget, this.domHandler);
+        this.evWin && addEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
+    },
+
+    /**
+     * unbind the events
+     */
+    destroy: function() {
+        this.evEl && removeEventListeners(this.element, this.evEl, this.domHandler);
+        this.evTarget && removeEventListeners(this.target, this.evTarget, this.domHandler);
+        this.evWin && removeEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
+    }
+};
+
+/**
+ * create new input type manager
+ * called by the Manager constructor
+ * @param {Hammer} manager
+ * @returns {Input}
+ */
+function createInputInstance(manager) {
+    var Type;
+    var inputClass = manager.options.inputClass;
+
+    if (inputClass) {
+        Type = inputClass;
+    } else if (SUPPORT_POINTER_EVENTS) {
+        Type = PointerEventInput;
+    } else if (SUPPORT_ONLY_TOUCH) {
+        Type = TouchInput;
+    } else if (!SUPPORT_TOUCH) {
+        Type = MouseInput;
+    } else {
+        Type = TouchMouseInput;
+    }
+    return new (Type)(manager, inputHandler);
+}
+
+/**
+ * handle input events
+ * @param {Manager} manager
+ * @param {String} eventType
+ * @param {Object} input
+ */
+function inputHandler(manager, eventType, input) {
+    var pointersLen = input.pointers.length;
+    var changedPointersLen = input.changedPointers.length;
+    var isFirst = (eventType & INPUT_START && (pointersLen - changedPointersLen === 0));
+    var isFinal = (eventType & (INPUT_END | INPUT_CANCEL) && (pointersLen - changedPointersLen === 0));
+
+    input.isFirst = !!isFirst;
+    input.isFinal = !!isFinal;
+
+    if (isFirst) {
+        manager.session = {};
+    }
+
+    // source event is the normalized value of the domEvents
+    // like 'touchstart, mouseup, pointerdown'
+    input.eventType = eventType;
+
+    // compute scale, rotation etc
+    computeInputData(manager, input);
+
+    // emit secret event
+    manager.emit('hammer.input', input);
+
+    manager.recognize(input);
+    manager.session.prevInput = input;
+}
+
+/**
+ * extend the data with some usable properties like scale, rotate, velocity etc
+ * @param {Object} manager
+ * @param {Object} input
+ */
+function computeInputData(manager, input) {
+    var session = manager.session;
+    var pointers = input.pointers;
+    var pointersLength = pointers.length;
+
+    // store the first input to calculate the distance and direction
+    if (!session.firstInput) {
+        session.firstInput = simpleCloneInputData(input);
+    }
+
+    // to compute scale and rotation we need to store the multiple touches
+    if (pointersLength > 1 && !session.firstMultiple) {
+        session.firstMultiple = simpleCloneInputData(input);
+    } else if (pointersLength === 1) {
+        session.firstMultiple = false;
+    }
+
+    var firstInput = session.firstInput;
+    var firstMultiple = session.firstMultiple;
+    var offsetCenter = firstMultiple ? firstMultiple.center : firstInput.center;
+
+    var center = input.center = getCenter(pointers);
+    input.timeStamp = now();
+    input.deltaTime = input.timeStamp - firstInput.timeStamp;
+
+    input.angle = getAngle(offsetCenter, center);
+    input.distance = getDistance(offsetCenter, center);
+
+    computeDeltaXY(session, input);
+    input.offsetDirection = getDirection(input.deltaX, input.deltaY);
+
+    var overallVelocity = getVelocity(input.deltaTime, input.deltaX, input.deltaY);
+    input.overallVelocityX = overallVelocity.x;
+    input.overallVelocityY = overallVelocity.y;
+    input.overallVelocity = (abs(overallVelocity.x) > abs(overallVelocity.y)) ? overallVelocity.x : overallVelocity.y;
+
+    input.scale = firstMultiple ? getScale(firstMultiple.pointers, pointers) : 1;
+    input.rotation = firstMultiple ? getRotation(firstMultiple.pointers, pointers) : 0;
+
+    input.maxPointers = !session.prevInput ? input.pointers.length : ((input.pointers.length >
+        session.prevInput.maxPointers) ? input.pointers.length : session.prevInput.maxPointers);
+
+    computeIntervalInputData(session, input);
+
+    // find the correct target
+    var target = manager.element;
+    if (hasParent(input.srcEvent.target, target)) {
+        target = input.srcEvent.target;
+    }
+    input.target = target;
+}
+
+function computeDeltaXY(session, input) {
+    var center = input.center;
+    var offset = session.offsetDelta || {};
+    var prevDelta = session.prevDelta || {};
+    var prevInput = session.prevInput || {};
+
+    if (input.eventType === INPUT_START || prevInput.eventType === INPUT_END) {
+        prevDelta = session.prevDelta = {
+            x: prevInput.deltaX || 0,
+            y: prevInput.deltaY || 0
+        };
+
+        offset = session.offsetDelta = {
+            x: center.x,
+            y: center.y
+        };
+    }
+
+    input.deltaX = prevDelta.x + (center.x - offset.x);
+    input.deltaY = prevDelta.y + (center.y - offset.y);
+}
+
+/**
+ * velocity is calculated every x ms
+ * @param {Object} session
+ * @param {Object} input
+ */
+function computeIntervalInputData(session, input) {
+    var last = session.lastInterval || input,
+        deltaTime = input.timeStamp - last.timeStamp,
+        velocity, velocityX, velocityY, direction;
+
+    if (input.eventType != INPUT_CANCEL && (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined)) {
+        var deltaX = input.deltaX - last.deltaX;
+        var deltaY = input.deltaY - last.deltaY;
+
+        var v = getVelocity(deltaTime, deltaX, deltaY);
+        velocityX = v.x;
+        velocityY = v.y;
+        velocity = (abs(v.x) > abs(v.y)) ? v.x : v.y;
+        direction = getDirection(deltaX, deltaY);
+
+        session.lastInterval = input;
+    } else {
+        // use latest velocity info if it doesn't overtake a minimum period
+        velocity = last.velocity;
+        velocityX = last.velocityX;
+        velocityY = last.velocityY;
+        direction = last.direction;
+    }
+
+    input.velocity = velocity;
+    input.velocityX = velocityX;
+    input.velocityY = velocityY;
+    input.direction = direction;
+}
+
+/**
+ * create a simple clone from the input used for storage of firstInput and firstMultiple
+ * @param {Object} input
+ * @returns {Object} clonedInputData
+ */
+function simpleCloneInputData(input) {
+    // make a simple copy of the pointers because we will get a reference if we don't
+    // we only need clientXY for the calculations
+    var pointers = [];
+    var i = 0;
+    while (i < input.pointers.length) {
+        pointers[i] = {
+            clientX: round(input.pointers[i].clientX),
+            clientY: round(input.pointers[i].clientY)
+        };
+        i++;
+    }
+
+    return {
+        timeStamp: now(),
+        pointers: pointers,
+        center: getCenter(pointers),
+        deltaX: input.deltaX,
+        deltaY: input.deltaY
+    };
+}
+
+/**
+ * get the center of all the pointers
+ * @param {Array} pointers
+ * @return {Object} center contains `x` and `y` properties
+ */
+function getCenter(pointers) {
+    var pointersLength = pointers.length;
+
+    // no need to loop when only one touch
+    if (pointersLength === 1) {
+        return {
+            x: round(pointers[0].clientX),
+            y: round(pointers[0].clientY)
+        };
+    }
+
+    var x = 0, y = 0, i = 0;
+    while (i < pointersLength) {
+        x += pointers[i].clientX;
+        y += pointers[i].clientY;
+        i++;
+    }
+
+    return {
+        x: round(x / pointersLength),
+        y: round(y / pointersLength)
+    };
+}
+
+/**
+ * calculate the velocity between two points. unit is in px per ms.
+ * @param {Number} deltaTime
+ * @param {Number} x
+ * @param {Number} y
+ * @return {Object} velocity `x` and `y`
+ */
+function getVelocity(deltaTime, x, y) {
+    return {
+        x: x / deltaTime || 0,
+        y: y / deltaTime || 0
+    };
+}
+
+/**
+ * get the direction between two points
+ * @param {Number} x
+ * @param {Number} y
+ * @return {Number} direction
+ */
+function getDirection(x, y) {
+    if (x === y) {
+        return DIRECTION_NONE;
+    }
+
+    if (abs(x) >= abs(y)) {
+        return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
+    }
+    return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
+}
+
+/**
+ * calculate the absolute distance between two points
+ * @param {Object} p1 {x, y}
+ * @param {Object} p2 {x, y}
+ * @param {Array} [props] containing x and y keys
+ * @return {Number} distance
+ */
+function getDistance(p1, p2, props) {
+    if (!props) {
+        props = PROPS_XY;
+    }
+    var x = p2[props[0]] - p1[props[0]],
+        y = p2[props[1]] - p1[props[1]];
+
+    return Math.sqrt((x * x) + (y * y));
+}
+
+/**
+ * calculate the angle between two coordinates
+ * @param {Object} p1
+ * @param {Object} p2
+ * @param {Array} [props] containing x and y keys
+ * @return {Number} angle
+ */
+function getAngle(p1, p2, props) {
+    if (!props) {
+        props = PROPS_XY;
+    }
+    var x = p2[props[0]] - p1[props[0]],
+        y = p2[props[1]] - p1[props[1]];
+    return Math.atan2(y, x) * 180 / Math.PI;
+}
+
+/**
+ * calculate the rotation degrees between two pointersets
+ * @param {Array} start array of pointers
+ * @param {Array} end array of pointers
+ * @return {Number} rotation
+ */
+function getRotation(start, end) {
+    return getAngle(end[1], end[0], PROPS_CLIENT_XY) + getAngle(start[1], start[0], PROPS_CLIENT_XY);
+}
+
+/**
+ * calculate the scale factor between two pointersets
+ * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out
+ * @param {Array} start array of pointers
+ * @param {Array} end array of pointers
+ * @return {Number} scale
+ */
+function getScale(start, end) {
+    return getDistance(end[0], end[1], PROPS_CLIENT_XY) / getDistance(start[0], start[1], PROPS_CLIENT_XY);
+}
+
+var MOUSE_INPUT_MAP = {
+    mousedown: INPUT_START,
+    mousemove: INPUT_MOVE,
+    mouseup: INPUT_END
+};
+
+var MOUSE_ELEMENT_EVENTS = 'mousedown';
+var MOUSE_WINDOW_EVENTS = 'mousemove mouseup';
+
+/**
+ * Mouse events input
+ * @constructor
+ * @extends Input
+ */
+function MouseInput() {
+    this.evEl = MOUSE_ELEMENT_EVENTS;
+    this.evWin = MOUSE_WINDOW_EVENTS;
+
+    this.pressed = false; // mousedown state
+
+    Input.apply(this, arguments);
+}
+
+inherit(MouseInput, Input, {
+    /**
+     * handle mouse events
+     * @param {Object} ev
+     */
+    handler: function MEhandler(ev) {
+        var eventType = MOUSE_INPUT_MAP[ev.type];
+
+        // on start we want to have the left mouse button down
+        if (eventType & INPUT_START && ev.button === 0) {
+            this.pressed = true;
+        }
+
+        if (eventType & INPUT_MOVE && ev.which !== 1) {
+            eventType = INPUT_END;
+        }
+
+        // mouse must be down
+        if (!this.pressed) {
+            return;
+        }
+
+        if (eventType & INPUT_END) {
+            this.pressed = false;
+        }
+
+        this.callback(this.manager, eventType, {
+            pointers: [ev],
+            changedPointers: [ev],
+            pointerType: INPUT_TYPE_MOUSE,
+            srcEvent: ev
+        });
+    }
+});
+
+var POINTER_INPUT_MAP = {
+    pointerdown: INPUT_START,
+    pointermove: INPUT_MOVE,
+    pointerup: INPUT_END,
+    pointercancel: INPUT_CANCEL,
+    pointerout: INPUT_CANCEL
+};
+
+// in IE10 the pointer types is defined as an enum
+var IE10_POINTER_TYPE_ENUM = {
+    2: INPUT_TYPE_TOUCH,
+    3: INPUT_TYPE_PEN,
+    4: INPUT_TYPE_MOUSE,
+    5: INPUT_TYPE_KINECT // see https://twitter.com/jacobrossi/status/480596438489890816
+};
+
+var POINTER_ELEMENT_EVENTS = 'pointerdown';
+var POINTER_WINDOW_EVENTS = 'pointermove pointerup pointercancel';
+
+// IE10 has prefixed support, and case-sensitive
+if (window.MSPointerEvent && !window.PointerEvent) {
+    POINTER_ELEMENT_EVENTS = 'MSPointerDown';
+    POINTER_WINDOW_EVENTS = 'MSPointerMove MSPointerUp MSPointerCancel';
+}
+
+/**
+ * Pointer events input
+ * @constructor
+ * @extends Input
+ */
+function PointerEventInput() {
+    this.evEl = POINTER_ELEMENT_EVENTS;
+    this.evWin = POINTER_WINDOW_EVENTS;
+
+    Input.apply(this, arguments);
+
+    this.store = (this.manager.session.pointerEvents = []);
+}
+
+inherit(PointerEventInput, Input, {
+    /**
+     * handle mouse events
+     * @param {Object} ev
+     */
+    handler: function PEhandler(ev) {
+        var store = this.store;
+        var removePointer = false;
+
+        var eventTypeNormalized = ev.type.toLowerCase().replace('ms', '');
+        var eventType = POINTER_INPUT_MAP[eventTypeNormalized];
+        var pointerType = IE10_POINTER_TYPE_ENUM[ev.pointerType] || ev.pointerType;
+
+        var isTouch = (pointerType == INPUT_TYPE_TOUCH);
+
+        // get index of the event in the store
+        var storeIndex = inArray(store, ev.pointerId, 'pointerId');
+
+        // start and mouse must be down
+        if (eventType & INPUT_START && (ev.button === 0 || isTouch)) {
+            if (storeIndex < 0) {
+                store.push(ev);
+                storeIndex = store.length - 1;
+            }
+        } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
+            removePointer = true;
+        }
+
+        // it not found, so the pointer hasn't been down (so it's probably a hover)
+        if (storeIndex < 0) {
+            return;
+        }
+
+        // update the event in the store
+        store[storeIndex] = ev;
+
+        this.callback(this.manager, eventType, {
+            pointers: store,
+            changedPointers: [ev],
+            pointerType: pointerType,
+            srcEvent: ev
+        });
+
+        if (removePointer) {
+            // remove from the store
+            store.splice(storeIndex, 1);
+        }
+    }
+});
+
+var SINGLE_TOUCH_INPUT_MAP = {
+    touchstart: INPUT_START,
+    touchmove: INPUT_MOVE,
+    touchend: INPUT_END,
+    touchcancel: INPUT_CANCEL
+};
+
+var SINGLE_TOUCH_TARGET_EVENTS = 'touchstart';
+var SINGLE_TOUCH_WINDOW_EVENTS = 'touchstart touchmove touchend touchcancel';
+
+/**
+ * Touch events input
+ * @constructor
+ * @extends Input
+ */
+function SingleTouchInput() {
+    this.evTarget = SINGLE_TOUCH_TARGET_EVENTS;
+    this.evWin = SINGLE_TOUCH_WINDOW_EVENTS;
+    this.started = false;
+
+    Input.apply(this, arguments);
+}
+
+inherit(SingleTouchInput, Input, {
+    handler: function TEhandler(ev) {
+        var type = SINGLE_TOUCH_INPUT_MAP[ev.type];
+
+        // should we handle the touch events?
+        if (type === INPUT_START) {
+            this.started = true;
+        }
+
+        if (!this.started) {
+            return;
+        }
+
+        var touches = normalizeSingleTouches.call(this, ev, type);
+
+        // when done, reset the started state
+        if (type & (INPUT_END | INPUT_CANCEL) && touches[0].length - touches[1].length === 0) {
+            this.started = false;
+        }
+
+        this.callback(this.manager, type, {
+            pointers: touches[0],
+            changedPointers: touches[1],
+            pointerType: INPUT_TYPE_TOUCH,
+            srcEvent: ev
+        });
+    }
+});
+
+/**
+ * @this {TouchInput}
+ * @param {Object} ev
+ * @param {Number} type flag
+ * @returns {undefined|Array} [all, changed]
+ */
+function normalizeSingleTouches(ev, type) {
+    var all = toArray(ev.touches);
+    var changed = toArray(ev.changedTouches);
+
+    if (type & (INPUT_END | INPUT_CANCEL)) {
+        all = uniqueArray(all.concat(changed), 'identifier', true);
+    }
+
+    return [all, changed];
+}
+
+var TOUCH_INPUT_MAP = {
+    touchstart: INPUT_START,
+    touchmove: INPUT_MOVE,
+    touchend: INPUT_END,
+    touchcancel: INPUT_CANCEL
+};
+
+var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';
+
+/**
+ * Multi-user touch events input
+ * @constructor
+ * @extends Input
+ */
+function TouchInput() {
+    this.evTarget = TOUCH_TARGET_EVENTS;
+    this.targetIds = {};
+
+    Input.apply(this, arguments);
+}
+
+inherit(TouchInput, Input, {
+    handler: function MTEhandler(ev) {
+        var type = TOUCH_INPUT_MAP[ev.type];
+        var touches = getTouches.call(this, ev, type);
+        if (!touches) {
+            return;
+        }
+
+        this.callback(this.manager, type, {
+            pointers: touches[0],
+            changedPointers: touches[1],
+            pointerType: INPUT_TYPE_TOUCH,
+            srcEvent: ev
+        });
+    }
+});
+
+/**
+ * @this {TouchInput}
+ * @param {Object} ev
+ * @param {Number} type flag
+ * @returns {undefined|Array} [all, changed]
+ */
+function getTouches(ev, type) {
+    var allTouches = toArray(ev.touches);
+    var targetIds = this.targetIds;
+
+    // when there is only one touch, the process can be simplified
+    if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
+        targetIds[allTouches[0].identifier] = true;
+        return [allTouches, allTouches];
+    }
+
+    var i,
+        targetTouches,
+        changedTouches = toArray(ev.changedTouches),
+        changedTargetTouches = [],
+        target = this.target;
+
+    // get target touches from touches
+    targetTouches = allTouches.filter(function(touch) {
+        return hasParent(touch.target, target);
+    });
+
+    // collect touches
+    if (type === INPUT_START) {
+        i = 0;
+        while (i < targetTouches.length) {
+            targetIds[targetTouches[i].identifier] = true;
+            i++;
+        }
+    }
+
+    // filter changed touches to only contain touches that exist in the collected target ids
+    i = 0;
+    while (i < changedTouches.length) {
+        if (targetIds[changedTouches[i].identifier]) {
+            changedTargetTouches.push(changedTouches[i]);
+        }
+
+        // cleanup removed touches
+        if (type & (INPUT_END | INPUT_CANCEL)) {
+            delete targetIds[changedTouches[i].identifier];
+        }
+        i++;
+    }
+
+    if (!changedTargetTouches.length) {
+        return;
+    }
+
+    return [
+        // merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
+        uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true),
+        changedTargetTouches
+    ];
+}
+
+/**
+ * Combined touch and mouse input
+ *
+ * Touch has a higher priority then mouse, and while touching no mouse events are allowed.
+ * This because touch devices also emit mouse events while doing a touch.
+ *
+ * @constructor
+ * @extends Input
+ */
+
+var DEDUP_TIMEOUT = 2500;
+var DEDUP_DISTANCE = 25;
+
+function TouchMouseInput() {
+    Input.apply(this, arguments);
+
+    var handler = bindFn(this.handler, this);
+    this.touch = new TouchInput(this.manager, handler);
+    this.mouse = new MouseInput(this.manager, handler);
+
+    this.primaryTouch = null;
+    this.lastTouches = [];
+}
+
+inherit(TouchMouseInput, Input, {
+    /**
+     * handle mouse and touch events
+     * @param {Hammer} manager
+     * @param {String} inputEvent
+     * @param {Object} inputData
+     */
+    handler: function TMEhandler(manager, inputEvent, inputData) {
+        var isTouch = (inputData.pointerType == INPUT_TYPE_TOUCH),
+            isMouse = (inputData.pointerType == INPUT_TYPE_MOUSE);
+
+        if (isMouse && inputData.sourceCapabilities && inputData.sourceCapabilities.firesTouchEvents) {
+            return;
+        }
+
+        // when we're in a touch event, record touches to  de-dupe synthetic mouse event
+        if (isTouch) {
+            recordTouches.call(this, inputEvent, inputData);
+        } else if (isMouse && isSyntheticEvent.call(this, inputData)) {
+            return;
+        }
+
+        this.callback(manager, inputEvent, inputData);
+    },
+
+    /**
+     * remove the event listeners
+     */
+    destroy: function destroy() {
+        this.touch.destroy();
+        this.mouse.destroy();
+    }
+});
+
+function recordTouches(eventType, eventData) {
+    if (eventType & INPUT_START) {
+        this.primaryTouch = eventData.changedPointers[0].identifier;
+        setLastTouch.call(this, eventData);
+    } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
+        setLastTouch.call(this, eventData);
+    }
+}
+
+function setLastTouch(eventData) {
+    var touch = eventData.changedPointers[0];
+
+    if (touch.identifier === this.primaryTouch) {
+        var lastTouch = {x: touch.clientX, y: touch.clientY};
+        this.lastTouches.push(lastTouch);
+        var lts = this.lastTouches;
+        var removeLastTouch = function() {
+            var i = lts.indexOf(lastTouch);
+            if (i > -1) {
+                lts.splice(i, 1);
+            }
+        };
+        setTimeout(removeLastTouch, DEDUP_TIMEOUT);
+    }
+}
+
+function isSyntheticEvent(eventData) {
+    var x = eventData.srcEvent.clientX, y = eventData.srcEvent.clientY;
+    for (var i = 0; i < this.lastTouches.length; i++) {
+        var t = this.lastTouches[i];
+        var dx = Math.abs(x - t.x), dy = Math.abs(y - t.y);
+        if (dx <= DEDUP_DISTANCE && dy <= DEDUP_DISTANCE) {
+            return true;
+        }
+    }
+    return false;
+}
+
+var PREFIXED_TOUCH_ACTION = prefixed(TEST_ELEMENT.style, 'touchAction');
+var NATIVE_TOUCH_ACTION = PREFIXED_TOUCH_ACTION !== undefined;
+
+// magical touchAction value
+var TOUCH_ACTION_COMPUTE = 'compute';
+var TOUCH_ACTION_AUTO = 'auto';
+var TOUCH_ACTION_MANIPULATION = 'manipulation'; // not implemented
+var TOUCH_ACTION_NONE = 'none';
+var TOUCH_ACTION_PAN_X = 'pan-x';
+var TOUCH_ACTION_PAN_Y = 'pan-y';
+var TOUCH_ACTION_MAP = getTouchActionProps();
+
+/**
+ * Touch Action
+ * sets the touchAction property or uses the js alternative
+ * @param {Manager} manager
+ * @param {String} value
+ * @constructor
+ */
+function TouchAction(manager, value) {
+    this.manager = manager;
+    this.set(value);
+}
+
+TouchAction.prototype = {
+    /**
+     * set the touchAction value on the element or enable the polyfill
+     * @param {String} value
+     */
+    set: function(value) {
+        // find out the touch-action by the event handlers
+        if (value == TOUCH_ACTION_COMPUTE) {
+            value = this.compute();
+        }
+
+        if (NATIVE_TOUCH_ACTION && this.manager.element.style && TOUCH_ACTION_MAP[value]) {
+            this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
+        }
+        this.actions = value.toLowerCase().trim();
+    },
+
+    /**
+     * just re-set the touchAction value
+     */
+    update: function() {
+        this.set(this.manager.options.touchAction);
+    },
+
+    /**
+     * compute the value for the touchAction property based on the recognizer's settings
+     * @returns {String} value
+     */
+    compute: function() {
+        var actions = [];
+        each(this.manager.recognizers, function(recognizer) {
+            if (boolOrFn(recognizer.options.enable, [recognizer])) {
+                actions = actions.concat(recognizer.getTouchAction());
+            }
+        });
+        return cleanTouchActions(actions.join(' '));
+    },
+
+    /**
+     * this method is called on each input cycle and provides the preventing of the browser behavior
+     * @param {Object} input
+     */
+    preventDefaults: function(input) {
+        var srcEvent = input.srcEvent;
+        var direction = input.offsetDirection;
+
+        // if the touch action did prevented once this session
+        if (this.manager.session.prevented) {
+            srcEvent.preventDefault();
+            return;
+        }
+
+        var actions = this.actions;
+        var hasNone = inStr(actions, TOUCH_ACTION_NONE) && !TOUCH_ACTION_MAP[TOUCH_ACTION_NONE];
+        var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_Y];
+        var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_X];
+
+        if (hasNone) {
+            //do not prevent defaults if this is a tap gesture
+
+            var isTapPointer = input.pointers.length === 1;
+            var isTapMovement = input.distance < 2;
+            var isTapTouchTime = input.deltaTime < 250;
+
+            if (isTapPointer && isTapMovement && isTapTouchTime) {
+                return;
+            }
+        }
+
+        if (hasPanX && hasPanY) {
+            // `pan-x pan-y` means browser handles all scrolling/panning, do not prevent
+            return;
+        }
+
+        if (hasNone ||
+            (hasPanY && direction & DIRECTION_HORIZONTAL) ||
+            (hasPanX && direction & DIRECTION_VERTICAL)) {
+            return this.preventSrc(srcEvent);
+        }
+    },
+
+    /**
+     * call preventDefault to prevent the browser's default behavior (scrolling in most cases)
+     * @param {Object} srcEvent
+     */
+    preventSrc: function(srcEvent) {
+        this.manager.session.prevented = true;
+        srcEvent.preventDefault();
+    }
+};
+
+/**
+ * when the touchActions are collected they are not a valid value, so we need to clean things up. *
+ * @param {String} actions
+ * @returns {*}
+ */
+function cleanTouchActions(actions) {
+    // none
+    if (inStr(actions, TOUCH_ACTION_NONE)) {
+        return TOUCH_ACTION_NONE;
+    }
+
+    var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X);
+    var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y);
+
+    // if both pan-x and pan-y are set (different recognizers
+    // for different directions, e.g. horizontal pan but vertical swipe?)
+    // we need none (as otherwise with pan-x pan-y combined none of these
+    // recognizers will work, since the browser would handle all panning
+    if (hasPanX && hasPanY) {
+        return TOUCH_ACTION_NONE;
+    }
+
+    // pan-x OR pan-y
+    if (hasPanX || hasPanY) {
+        return hasPanX ? TOUCH_ACTION_PAN_X : TOUCH_ACTION_PAN_Y;
+    }
+
+    // manipulation
+    if (inStr(actions, TOUCH_ACTION_MANIPULATION)) {
+        return TOUCH_ACTION_MANIPULATION;
+    }
+
+    return TOUCH_ACTION_AUTO;
+}
+
+function getTouchActionProps() {
+    if (!NATIVE_TOUCH_ACTION) {
+        return false;
+    }
+    var touchMap = {};
+    var cssSupports = window.CSS && window.CSS.supports;
+    ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach(function(val) {
+
+        // If css.supports is not supported but there is native touch-action assume it supports
+        // all values. This is the case for IE 10 and 11.
+        touchMap[val] = cssSupports ? window.CSS.supports('touch-action', val) : true;
+    });
+    return touchMap;
+}
+
+/**
+ * Recognizer flow explained; *
+ * All recognizers have the initial state of POSSIBLE when a input session starts.
+ * The definition of a input session is from the first input until the last input, with all it's movement in it. *
+ * Example session for mouse-input: mousedown -> mousemove -> mouseup
+ *
+ * On each recognizing cycle (see Manager.recognize) the .recognize() method is executed
+ * which determines with state it should be.
+ *
+ * If the recognizer has the state FAILED, CANCELLED or RECOGNIZED (equals ENDED), it is reset to
+ * POSSIBLE to give it another change on the next cycle.
+ *
+ *               Possible
+ *                  |
+ *            +-----+---------------+
+ *            |                     |
+ *      +-----+-----+               |
+ *      |           |               |
+ *   Failed      Cancelled          |
+ *                          +-------+------+
+ *                          |              |
+ *                      Recognized       Began
+ *                                         |
+ *                                      Changed
+ *                                         |
+ *                                  Ended/Recognized
+ */
+var STATE_POSSIBLE = 1;
+var STATE_BEGAN = 2;
+var STATE_CHANGED = 4;
+var STATE_ENDED = 8;
+var STATE_RECOGNIZED = STATE_ENDED;
+var STATE_CANCELLED = 16;
+var STATE_FAILED = 32;
+
+/**
+ * Recognizer
+ * Every recognizer needs to extend from this class.
+ * @constructor
+ * @param {Object} options
+ */
+function Recognizer(options) {
+    this.options = assign({}, this.defaults, options || {});
+
+    this.id = uniqueId();
+
+    this.manager = null;
+
+    // default is enable true
+    this.options.enable = ifUndefined(this.options.enable, true);
+
+    this.state = STATE_POSSIBLE;
+
+    this.simultaneous = {};
+    this.requireFail = [];
+}
+
+Recognizer.prototype = {
+    /**
+     * @virtual
+     * @type {Object}
+     */
+    defaults: {},
+
+    /**
+     * set options
+     * @param {Object} options
+     * @return {Recognizer}
+     */
+    set: function(options) {
+        assign(this.options, options);
+
+        // also update the touchAction, in case something changed about the directions/enabled state
+        this.manager && this.manager.touchAction.update();
+        return this;
+    },
+
+    /**
+     * recognize simultaneous with an other recognizer.
+     * @param {Recognizer} otherRecognizer
+     * @returns {Recognizer} this
+     */
+    recognizeWith: function(otherRecognizer) {
+        if (invokeArrayArg(otherRecognizer, 'recognizeWith', this)) {
+            return this;
+        }
+
+        var simultaneous = this.simultaneous;
+        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
+        if (!simultaneous[otherRecognizer.id]) {
+            simultaneous[otherRecognizer.id] = otherRecognizer;
+            otherRecognizer.recognizeWith(this);
+        }
+        return this;
+    },
+
+    /**
+     * drop the simultaneous link. it doesnt remove the link on the other recognizer.
+     * @param {Recognizer} otherRecognizer
+     * @returns {Recognizer} this
+     */
+    dropRecognizeWith: function(otherRecognizer) {
+        if (invokeArrayArg(otherRecognizer, 'dropRecognizeWith', this)) {
+            return this;
+        }
+
+        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
+        delete this.simultaneous[otherRecognizer.id];
+        return this;
+    },
+
+    /**
+     * recognizer can only run when an other is failing
+     * @param {Recognizer} otherRecognizer
+     * @returns {Recognizer} this
+     */
+    requireFailure: function(otherRecognizer) {
+        if (invokeArrayArg(otherRecognizer, 'requireFailure', this)) {
+            return this;
+        }
+
+        var requireFail = this.requireFail;
+        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
+        if (inArray(requireFail, otherRecognizer) === -1) {
+            requireFail.push(otherRecognizer);
+            otherRecognizer.requireFailure(this);
+        }
+        return this;
+    },
+
+    /**
+     * drop the requireFailure link. it does not remove the link on the other recognizer.
+     * @param {Recognizer} otherRecognizer
+     * @returns {Recognizer} this
+     */
+    dropRequireFailure: function(otherRecognizer) {
+        if (invokeArrayArg(otherRecognizer, 'dropRequireFailure', this)) {
+            return this;
+        }
+
+        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
+        var index = inArray(this.requireFail, otherRecognizer);
+        if (index > -1) {
+            this.requireFail.splice(index, 1);
+        }
+        return this;
+    },
+
+    /**
+     * has require failures boolean
+     * @returns {boolean}
+     */
+    hasRequireFailures: function() {
+        return this.requireFail.length > 0;
+    },
+
+    /**
+     * if the recognizer can recognize simultaneous with an other recognizer
+     * @param {Recognizer} otherRecognizer
+     * @returns {Boolean}
+     */
+    canRecognizeWith: function(otherRecognizer) {
+        return !!this.simultaneous[otherRecognizer.id];
+    },
+
+    /**
+     * You should use `tryEmit` instead of `emit` directly to check
+     * that all the needed recognizers has failed before emitting.
+     * @param {Object} input
+     */
+    emit: function(input) {
+        var self = this;
+        var state = this.state;
+
+        function emit(event) {
+            self.manager.emit(event, input);
+        }
+
+        // 'panstart' and 'panmove'
+        if (state < STATE_ENDED) {
+            emit(self.options.event + stateStr(state));
+        }
+
+        emit(self.options.event); // simple 'eventName' events
+
+        if (input.additionalEvent) { // additional event(panleft, panright, pinchin, pinchout...)
+            emit(input.additionalEvent);
+        }
+
+        // panend and pancancel
+        if (state >= STATE_ENDED) {
+            emit(self.options.event + stateStr(state));
+        }
+    },
+
+    /**
+     * Check that all the require failure recognizers has failed,
+     * if true, it emits a gesture event,
+     * otherwise, setup the state to FAILED.
+     * @param {Object} input
+     */
+    tryEmit: function(input) {
+        if (this.canEmit()) {
+            return this.emit(input);
+        }
+        // it's failing anyway
+        this.state = STATE_FAILED;
+    },
+
+    /**
+     * can we emit?
+     * @returns {boolean}
+     */
+    canEmit: function() {
+        var i = 0;
+        while (i < this.requireFail.length) {
+            if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {
+                return false;
+            }
+            i++;
+        }
+        return true;
+    },
+
+    /**
+     * update the recognizer
+     * @param {Object} inputData
+     */
+    recognize: function(inputData) {
+        // make a new copy of the inputData
+        // so we can change the inputData without messing up the other recognizers
+        var inputDataClone = assign({}, inputData);
+
+        // is is enabled and allow recognizing?
+        if (!boolOrFn(this.options.enable, [this, inputDataClone])) {
+            this.reset();
+            this.state = STATE_FAILED;
+            return;
+        }
+
+        // reset when we've reached the end
+        if (this.state & (STATE_RECOGNIZED | STATE_CANCELLED | STATE_FAILED)) {
+            this.state = STATE_POSSIBLE;
+        }
+
+        this.state = this.process(inputDataClone);
+
+        // the recognizer has recognized a gesture
+        // so trigger an event
+        if (this.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED | STATE_CANCELLED)) {
+            this.tryEmit(inputDataClone);
+        }
+    },
+
+    /**
+     * return the state of the recognizer
+     * the actual recognizing happens in this method
+     * @virtual
+     * @param {Object} inputData
+     * @returns {Const} STATE
+     */
+    process: function(inputData) { }, // jshint ignore:line
+
+    /**
+     * return the preferred touch-action
+     * @virtual
+     * @returns {Array}
+     */
+    getTouchAction: function() { },
+
+    /**
+     * called when the gesture isn't allowed to recognize
+     * like when another is being recognized or it is disabled
+     * @virtual
+     */
+    reset: function() { }
+};
+
+/**
+ * get a usable string, used as event postfix
+ * @param {Const} state
+ * @returns {String} state
+ */
+function stateStr(state) {
+    if (state & STATE_CANCELLED) {
+        return 'cancel';
+    } else if (state & STATE_ENDED) {
+        return 'end';
+    } else if (state & STATE_CHANGED) {
+        return 'move';
+    } else if (state & STATE_BEGAN) {
+        return 'start';
+    }
+    return '';
+}
+
+/**
+ * direction cons to string
+ * @param {Const} direction
+ * @returns {String}
+ */
+function directionStr(direction) {
+    if (direction == DIRECTION_DOWN) {
+        return 'down';
+    } else if (direction == DIRECTION_UP) {
+        return 'up';
+    } else if (direction == DIRECTION_LEFT) {
+        return 'left';
+    } else if (direction == DIRECTION_RIGHT) {
+        return 'right';
+    }
+    return '';
+}
+
+/**
+ * get a recognizer by name if it is bound to a manager
+ * @param {Recognizer|String} otherRecognizer
+ * @param {Recognizer} recognizer
+ * @returns {Recognizer}
+ */
+function getRecognizerByNameIfManager(otherRecognizer, recognizer) {
+    var manager = recognizer.manager;
+    if (manager) {
+        return manager.get(otherRecognizer);
+    }
+    return otherRecognizer;
+}
+
+/**
+ * This recognizer is just used as a base for the simple attribute recognizers.
+ * @constructor
+ * @extends Recognizer
+ */
+function AttrRecognizer() {
+    Recognizer.apply(this, arguments);
+}
+
+inherit(AttrRecognizer, Recognizer, {
+    /**
+     * @namespace
+     * @memberof AttrRecognizer
+     */
+    defaults: {
+        /**
+         * @type {Number}
+         * @default 1
+         */
+        pointers: 1
+    },
+
+    /**
+     * Used to check if it the recognizer receives valid input, like input.distance > 10.
+     * @memberof AttrRecognizer
+     * @param {Object} input
+     * @returns {Boolean} recognized
+     */
+    attrTest: function(input) {
+        var optionPointers = this.options.pointers;
+        return optionPointers === 0 || input.pointers.length === optionPointers;
+    },
+
+    /**
+     * Process the input and return the state for the recognizer
+     * @memberof AttrRecognizer
+     * @param {Object} input
+     * @returns {*} State
+     */
+    process: function(input) {
+        var state = this.state;
+        var eventType = input.eventType;
+
+        var isRecognized = state & (STATE_BEGAN | STATE_CHANGED);
+        var isValid = this.attrTest(input);
+
+        // on cancel input and we've recognized before, return STATE_CANCELLED
+        if (isRecognized && (eventType & INPUT_CANCEL || !isValid)) {
+            return state | STATE_CANCELLED;
+        } else if (isRecognized || isValid) {
+            if (eventType & INPUT_END) {
+                return state | STATE_ENDED;
+            } else if (!(state & STATE_BEGAN)) {
+                return STATE_BEGAN;
+            }
+            return state | STATE_CHANGED;
+        }
+        return STATE_FAILED;
+    }
+});
+
+/**
+ * Pan
+ * Recognized when the pointer is down and moved in the allowed direction.
+ * @constructor
+ * @extends AttrRecognizer
+ */
+function PanRecognizer() {
+    AttrRecognizer.apply(this, arguments);
+
+    this.pX = null;
+    this.pY = null;
+}
+
+inherit(PanRecognizer, AttrRecognizer, {
+    /**
+     * @namespace
+     * @memberof PanRecognizer
+     */
+    defaults: {
+        event: 'pan',
+        threshold: 10,
+        pointers: 1,
+        direction: DIRECTION_ALL
+    },
+
+    getTouchAction: function() {
+        var direction = this.options.direction;
+        var actions = [];
+        if (direction & DIRECTION_HORIZONTAL) {
+            actions.push(TOUCH_ACTION_PAN_Y);
+        }
+        if (direction & DIRECTION_VERTICAL) {
+            actions.push(TOUCH_ACTION_PAN_X);
+        }
+        return actions;
+    },
+
+    directionTest: function(input) {
+        var options = this.options;
+        var hasMoved = true;
+        var distance = input.distance;
+        var direction = input.direction;
+        var x = input.deltaX;
+        var y = input.deltaY;
+
+        // lock to axis?
+        if (!(direction & options.direction)) {
+            if (options.direction & DIRECTION_HORIZONTAL) {
+                direction = (x === 0) ? DIRECTION_NONE : (x < 0) ? DIRECTION_LEFT : DIRECTION_RIGHT;
+                hasMoved = x != this.pX;
+                distance = Math.abs(input.deltaX);
+            } else {
+                direction = (y === 0) ? DIRECTION_NONE : (y < 0) ? DIRECTION_UP : DIRECTION_DOWN;
+                hasMoved = y != this.pY;
+                distance = Math.abs(input.deltaY);
+            }
+        }
+        input.direction = direction;
+        return hasMoved && distance > options.threshold && direction & options.direction;
+    },
+
+    attrTest: function(input) {
+        return AttrRecognizer.prototype.attrTest.call(this, input) &&
+            (this.state & STATE_BEGAN || (!(this.state & STATE_BEGAN) && this.directionTest(input)));
+    },
+
+    emit: function(input) {
+
+        this.pX = input.deltaX;
+        this.pY = input.deltaY;
+
+        var direction = directionStr(input.direction);
+
+        if (direction) {
+            input.additionalEvent = this.options.event + direction;
+        }
+        this._super.emit.call(this, input);
+    }
+});
+
+/**
+ * Pinch
+ * Recognized when two or more pointers are moving toward (zoom-in) or away from each other (zoom-out).
+ * @constructor
+ * @extends AttrRecognizer
+ */
+function PinchRecognizer() {
+    AttrRecognizer.apply(this, arguments);
+}
+
+inherit(PinchRecognizer, AttrRecognizer, {
+    /**
+     * @namespace
+     * @memberof PinchRecognizer
+     */
+    defaults: {
+        event: 'pinch',
+        threshold: 0,
+        pointers: 2
+    },
+
+    getTouchAction: function() {
+        return [TOUCH_ACTION_NONE];
+    },
+
+    attrTest: function(input) {
+        return this._super.attrTest.call(this, input) &&
+            (Math.abs(input.scale - 1) > this.options.threshold || this.state & STATE_BEGAN);
+    },
+
+    emit: function(input) {
+        if (input.scale !== 1) {
+            var inOut = input.scale < 1 ? 'in' : 'out';
+            input.additionalEvent = this.options.event + inOut;
+        }
+        this._super.emit.call(this, input);
+    }
+});
+
+/**
+ * Press
+ * Recognized when the pointer is down for x ms without any movement.
+ * @constructor
+ * @extends Recognizer
+ */
+function PressRecognizer() {
+    Recognizer.apply(this, arguments);
+
+    this._timer = null;
+    this._input = null;
+}
+
+inherit(PressRecognizer, Recognizer, {
+    /**
+     * @namespace
+     * @memberof PressRecognizer
+     */
+    defaults: {
+        event: 'press',
+        pointers: 1,
+        time: 251, // minimal time of the pointer to be pressed
+        threshold: 9 // a minimal movement is ok, but keep it low
+    },
+
+    getTouchAction: function() {
+        return [TOUCH_ACTION_AUTO];
+    },
+
+    process: function(input) {
+        var options = this.options;
+        var validPointers = input.pointers.length === options.pointers;
+        var validMovement = input.distance < options.threshold;
+        var validTime = input.deltaTime > options.time;
+
+        this._input = input;
+
+        // we only allow little movement
+        // and we've reached an end event, so a tap is possible
+        if (!validMovement || !validPointers || (input.eventType & (INPUT_END | INPUT_CANCEL) && !validTime)) {
+            this.reset();
+        } else if (input.eventType & INPUT_START) {
+            this.reset();
+            this._timer = setTimeoutContext(function() {
+                this.state = STATE_RECOGNIZED;
+                this.tryEmit();
+            }, options.time, this);
+        } else if (input.eventType & INPUT_END) {
+            return STATE_RECOGNIZED;
+        }
+        return STATE_FAILED;
+    },
+
+    reset: function() {
+        clearTimeout(this._timer);
+    },
+
+    emit: function(input) {
+        if (this.state !== STATE_RECOGNIZED) {
+            return;
+        }
+
+        if (input && (input.eventType & INPUT_END)) {
+            this.manager.emit(this.options.event + 'up', input);
+        } else {
+            this._input.timeStamp = now();
+            this.manager.emit(this.options.event, this._input);
+        }
+    }
+});
+
+/**
+ * Rotate
+ * Recognized when two or more pointer are moving in a circular motion.
+ * @constructor
+ * @extends AttrRecognizer
+ */
+function RotateRecognizer() {
+    AttrRecognizer.apply(this, arguments);
+}
+
+inherit(RotateRecognizer, AttrRecognizer, {
+    /**
+     * @namespace
+     * @memberof RotateRecognizer
+     */
+    defaults: {
+        event: 'rotate',
+        threshold: 0,
+        pointers: 2
+    },
+
+    getTouchAction: function() {
+        return [TOUCH_ACTION_NONE];
+    },
+
+    attrTest: function(input) {
+        return this._super.attrTest.call(this, input) &&
+            (Math.abs(input.rotation) > this.options.threshold || this.state & STATE_BEGAN);
+    }
+});
+
+/**
+ * Swipe
+ * Recognized when the pointer is moving fast (velocity), with enough distance in the allowed direction.
+ * @constructor
+ * @extends AttrRecognizer
+ */
+function SwipeRecognizer() {
+    AttrRecognizer.apply(this, arguments);
+}
+
+inherit(SwipeRecognizer, AttrRecognizer, {
+    /**
+     * @namespace
+     * @memberof SwipeRecognizer
+     */
+    defaults: {
+        event: 'swipe',
+        threshold: 10,
+        velocity: 0.3,
+        direction: DIRECTION_HORIZONTAL | DIRECTION_VERTICAL,
+        pointers: 1
+    },
+
+    getTouchAction: function() {
+        return PanRecognizer.prototype.getTouchAction.call(this);
+    },
+
+    attrTest: function(input) {
+        var direction = this.options.direction;
+        var velocity;
+
+        if (direction & (DIRECTION_HORIZONTAL | DIRECTION_VERTICAL)) {
+            velocity = input.overallVelocity;
+        } else if (direction & DIRECTION_HORIZONTAL) {
+            velocity = input.overallVelocityX;
+        } else if (direction & DIRECTION_VERTICAL) {
+            velocity = input.overallVelocityY;
+        }
+
+        return this._super.attrTest.call(this, input) &&
+            direction & input.offsetDirection &&
+            input.distance > this.options.threshold &&
+            input.maxPointers == this.options.pointers &&
+            abs(velocity) > this.options.velocity && input.eventType & INPUT_END;
+    },
+
+    emit: function(input) {
+        var direction = directionStr(input.offsetDirection);
+        if (direction) {
+            this.manager.emit(this.options.event + direction, input);
+        }
+
+        this.manager.emit(this.options.event, input);
+    }
+});
+
+/**
+ * A tap is ecognized when the pointer is doing a small tap/click. Multiple taps are recognized if they occur
+ * between the given interval and position. The delay option can be used to recognize multi-taps without firing
+ * a single tap.
+ *
+ * The eventData from the emitted event contains the property `tapCount`, which contains the amount of
+ * multi-taps being recognized.
+ * @constructor
+ * @extends Recognizer
+ */
+function TapRecognizer() {
+    Recognizer.apply(this, arguments);
+
+    // previous time and center,
+    // used for tap counting
+    this.pTime = false;
+    this.pCenter = false;
+
+    this._timer = null;
+    this._input = null;
+    this.count = 0;
+}
+
+inherit(TapRecognizer, Recognizer, {
+    /**
+     * @namespace
+     * @memberof PinchRecognizer
+     */
+    defaults: {
+        event: 'tap',
+        pointers: 1,
+        taps: 1,
+        interval: 300, // max time between the multi-tap taps
+        time: 250, // max time of the pointer to be down (like finger on the screen)
+        threshold: 9, // a minimal movement is ok, but keep it low
+        posThreshold: 10 // a multi-tap can be a bit off the initial position
+    },
+
+    getTouchAction: function() {
+        return [TOUCH_ACTION_MANIPULATION];
+    },
+
+    process: function(input) {
+        var options = this.options;
+
+        var validPointers = input.pointers.length === options.pointers;
+        var validMovement = input.distance < options.threshold;
+        var validTouchTime = input.deltaTime < options.time;
+
+        this.reset();
+
+        if ((input.eventType & INPUT_START) && (this.count === 0)) {
+            return this.failTimeout();
+        }
+
+        // we only allow little movement
+        // and we've reached an end event, so a tap is possible
+        if (validMovement && validTouchTime && validPointers) {
+            if (input.eventType != INPUT_END) {
+                return this.failTimeout();
+            }
+
+            var validInterval = this.pTime ? (input.timeStamp - this.pTime < options.interval) : true;
+            var validMultiTap = !this.pCenter || getDistance(this.pCenter, input.center) < options.posThreshold;
+
+            this.pTime = input.timeStamp;
+            this.pCenter = input.center;
+
+            if (!validMultiTap || !validInterval) {
+                this.count = 1;
+            } else {
+                this.count += 1;
+            }
+
+            this._input = input;
+
+            // if tap count matches we have recognized it,
+            // else it has began recognizing...
+            var tapCount = this.count % options.taps;
+            if (tapCount === 0) {
+                // no failing requirements, immediately trigger the tap event
+                // or wait as long as the multitap interval to trigger
+                if (!this.hasRequireFailures()) {
+                    return STATE_RECOGNIZED;
+                } else {
+                    this._timer = setTimeoutContext(function() {
+                        this.state = STATE_RECOGNIZED;
+                        this.tryEmit();
+                    }, options.interval, this);
+                    return STATE_BEGAN;
+                }
+            }
+        }
+        return STATE_FAILED;
+    },
+
+    failTimeout: function() {
+        this._timer = setTimeoutContext(function() {
+            this.state = STATE_FAILED;
+        }, this.options.interval, this);
+        return STATE_FAILED;
+    },
+
+    reset: function() {
+        clearTimeout(this._timer);
+    },
+
+    emit: function() {
+        if (this.state == STATE_RECOGNIZED) {
+            this._input.tapCount = this.count;
+            this.manager.emit(this.options.event, this._input);
+        }
+    }
+});
+
+/**
+ * Simple way to create a manager with a default set of recognizers.
+ * @param {Document} element
+ * @param {Object} [options]
+ * @constructor
+ */
+function Hammer(element, options) {
+    options = options || {};
+    options.recognizers = ifUndefined(options.recognizers, Hammer.defaults.preset);
+    return new Manager(element, options);
+}
+
+/**
+ * @const {string}
+ */
+Hammer.VERSION = '2.0.7';
+
+/**
+ * default settings
+ * @namespace
+ */
+Hammer.defaults = {
+    /**
+     * set if DOM events are being triggered.
+     * But this is slower and unused by simple implementations, so disabled by default.
+     * @type {Boolean}
+     * @default false
+     */
+    domEvents: false,
+
+    /**
+     * The value for the touchAction property/fallback.
+     * When set to `compute` it will magically set the correct value based on the added recognizers.
+     * @type {String}
+     * @default compute
+     */
+    touchAction: TOUCH_ACTION_COMPUTE,
+
+    /**
+     * @type {Boolean}
+     * @default true
+     */
+    enable: true,
+
+    /**
+     * EXPERIMENTAL FEATURE -- can be removed/changed
+     * Change the parent input target element.
+     * If Null, then it is being set the to main element.
+     * @type {Null|EventTarget}
+     * @default null
+     */
+    inputTarget: null,
+
+    /**
+     * force an input class
+     * @type {Null|Function}
+     * @default null
+     */
+    inputClass: null,
+
+    /**
+     * Default recognizer setup when calling `Hammer()`
+     * When creating a new Manager these will be skipped.
+     * @type {Array}
+     */
+    preset: [
+        // RecognizerClass, options, [recognizeWith, ...], [requireFailure, ...]
+        [RotateRecognizer, {enable: false}],
+        [PinchRecognizer, {enable: false}, ['rotate']],
+        [SwipeRecognizer, {direction: DIRECTION_HORIZONTAL}],
+        [PanRecognizer, {direction: DIRECTION_HORIZONTAL}, ['swipe']],
+        [TapRecognizer],
+        [TapRecognizer, {event: 'doubletap', taps: 2}, ['tap']],
+        [PressRecognizer]
+    ],
+
+    /**
+     * Some CSS properties can be used to improve the working of Hammer.
+     * Add them to this method and they will be set when creating a new Manager.
+     * @namespace
+     */
+    cssProps: {
+        /**
+         * Disables text selection to improve the dragging gesture. Mainly for desktop browsers.
+         * @type {String}
+         * @default 'none'
+         */
+        userSelect: 'none',
+
+        /**
+         * Disable the Windows Phone grippers when pressing an element.
+         * @type {String}
+         * @default 'none'
+         */
+        touchSelect: 'none',
+
+        /**
+         * Disables the default callout shown when you touch and hold a touch target.
+         * On iOS, when you touch and hold a touch target such as a link, Safari displays
+         * a callout containing information about the link. This property allows you to disable that callout.
+         * @type {String}
+         * @default 'none'
+         */
+        touchCallout: 'none',
+
+        /**
+         * Specifies whether zooming is enabled. Used by IE10>
+         * @type {String}
+         * @default 'none'
+         */
+        contentZooming: 'none',
+
+        /**
+         * Specifies that an entire element should be draggable instead of its contents. Mainly for desktop browsers.
+         * @type {String}
+         * @default 'none'
+         */
+        userDrag: 'none',
+
+        /**
+         * Overrides the highlight color shown when the user taps a link or a JavaScript
+         * clickable element in iOS. This property obeys the alpha value, if specified.
+         * @type {String}
+         * @default 'rgba(0,0,0,0)'
+         */
+        tapHighlightColor: 'rgba(0,0,0,0)'
+    }
+};
+
+var STOP = 1;
+var FORCED_STOP = 2;
+
+/**
+ * Manager
+ * @param {HTMLElement} element
+ * @param {Object} [options]
+ * @constructor
+ */
+function Manager(element, options) {
+    this.options = assign({}, Hammer.defaults, options || {});
+
+    this.options.inputTarget = this.options.inputTarget || element;
+
+    this.handlers = {};
+    this.session = {};
+    this.recognizers = [];
+    this.oldCssProps = {};
+
+    this.element = element;
+    this.input = createInputInstance(this);
+    this.touchAction = new TouchAction(this, this.options.touchAction);
+
+    toggleCssProps(this, true);
+
+    each(this.options.recognizers, function(item) {
+        var recognizer = this.add(new (item[0])(item[1]));
+        item[2] && recognizer.recognizeWith(item[2]);
+        item[3] && recognizer.requireFailure(item[3]);
+    }, this);
+}
+
+Manager.prototype = {
+    /**
+     * set options
+     * @param {Object} options
+     * @returns {Manager}
+     */
+    set: function(options) {
+        assign(this.options, options);
+
+        // Options that need a little more setup
+        if (options.touchAction) {
+            this.touchAction.update();
+        }
+        if (options.inputTarget) {
+            // Clean up existing event listeners and reinitialize
+            this.input.destroy();
+            this.input.target = options.inputTarget;
+            this.input.init();
+        }
+        return this;
+    },
+
+    /**
+     * stop recognizing for this session.
+     * This session will be discarded, when a new [input]start event is fired.
+     * When forced, the recognizer cycle is stopped immediately.
+     * @param {Boolean} [force]
+     */
+    stop: function(force) {
+        this.session.stopped = force ? FORCED_STOP : STOP;
+    },
+
+    /**
+     * run the recognizers!
+     * called by the inputHandler function on every movement of the pointers (touches)
+     * it walks through all the recognizers and tries to detect the gesture that is being made
+     * @param {Object} inputData
+     */
+    recognize: function(inputData) {
+        var session = this.session;
+        if (session.stopped) {
+            return;
+        }
+
+        // run the touch-action polyfill
+        this.touchAction.preventDefaults(inputData);
+
+        var recognizer;
+        var recognizers = this.recognizers;
+
+        // this holds the recognizer that is being recognized.
+        // so the recognizer's state needs to be BEGAN, CHANGED, ENDED or RECOGNIZED
+        // if no recognizer is detecting a thing, it is set to `null`
+        var curRecognizer = session.curRecognizer;
+
+        // reset when the last recognizer is recognized
+        // or when we're in a new session
+        if (!curRecognizer || (curRecognizer && curRecognizer.state & STATE_RECOGNIZED)) {
+            curRecognizer = session.curRecognizer = null;
+        }
+
+        var i = 0;
+        while (i < recognizers.length) {
+            recognizer = recognizers[i];
+
+            // find out if we are allowed try to recognize the input for this one.
+            // 1.   allow if the session is NOT forced stopped (see the .stop() method)
+            // 2.   allow if we still haven't recognized a gesture in this session, or the this recognizer is the one
+            //      that is being recognized.
+            // 3.   allow if the recognizer is allowed to run simultaneous with the current recognized recognizer.
+            //      this can be setup with the `recognizeWith()` method on the recognizer.
+            if (session.stopped !== FORCED_STOP && ( // 1
+                    !curRecognizer || recognizer == curRecognizer || // 2
+                    recognizer.canRecognizeWith(curRecognizer))) { // 3
+                recognizer.recognize(inputData);
+            } else {
+                recognizer.reset();
+            }
+
+            // if the recognizer has been recognizing the input as a valid gesture, we want to store this one as the
+            // current active recognizer. but only if we don't already have an active recognizer
+            if (!curRecognizer && recognizer.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED)) {
+                curRecognizer = session.curRecognizer = recognizer;
+            }
+            i++;
+        }
+    },
+
+    /**
+     * get a recognizer by its event name.
+     * @param {Recognizer|String} recognizer
+     * @returns {Recognizer|Null}
+     */
+    get: function(recognizer) {
+        if (recognizer instanceof Recognizer) {
+            return recognizer;
+        }
+
+        var recognizers = this.recognizers;
+        for (var i = 0; i < recognizers.length; i++) {
+            if (recognizers[i].options.event == recognizer) {
+                return recognizers[i];
+            }
+        }
+        return null;
+    },
+
+    /**
+     * add a recognizer to the manager
+     * existing recognizers with the same event name will be removed
+     * @param {Recognizer} recognizer
+     * @returns {Recognizer|Manager}
+     */
+    add: function(recognizer) {
+        if (invokeArrayArg(recognizer, 'add', this)) {
+            return this;
+        }
+
+        // remove existing
+        var existing = this.get(recognizer.options.event);
+        if (existing) {
+            this.remove(existing);
+        }
+
+        this.recognizers.push(recognizer);
+        recognizer.manager = this;
+
+        this.touchAction.update();
+        return recognizer;
+    },
+
+    /**
+     * remove a recognizer by name or instance
+     * @param {Recognizer|String} recognizer
+     * @returns {Manager}
+     */
+    remove: function(recognizer) {
+        if (invokeArrayArg(recognizer, 'remove', this)) {
+            return this;
+        }
+
+        recognizer = this.get(recognizer);
+
+        // let's make sure this recognizer exists
+        if (recognizer) {
+            var recognizers = this.recognizers;
+            var index = inArray(recognizers, recognizer);
+
+            if (index !== -1) {
+                recognizers.splice(index, 1);
+                this.touchAction.update();
+            }
+        }
+
+        return this;
+    },
+
+    /**
+     * bind event
+     * @param {String} events
+     * @param {Function} handler
+     * @returns {EventEmitter} this
+     */
+    on: function(events, handler) {
+        if (events === undefined) {
+            return;
+        }
+        if (handler === undefined) {
+            return;
+        }
+
+        var handlers = this.handlers;
+        each(splitStr(events), function(event) {
+            handlers[event] = handlers[event] || [];
+            handlers[event].push(handler);
+        });
+        return this;
+    },
+
+    /**
+     * unbind event, leave emit blank to remove all handlers
+     * @param {String} events
+     * @param {Function} [handler]
+     * @returns {EventEmitter} this
+     */
+    off: function(events, handler) {
+        if (events === undefined) {
+            return;
+        }
+
+        var handlers = this.handlers;
+        each(splitStr(events), function(event) {
+            if (!handler) {
+                delete handlers[event];
+            } else {
+                handlers[event] && handlers[event].splice(inArray(handlers[event], handler), 1);
+            }
+        });
+        return this;
+    },
+
+    /**
+     * emit event to the listeners
+     * @param {String} event
+     * @param {Object} data
+     */
+    emit: function(event, data) {
+        // we also want to trigger dom events
+        if (this.options.domEvents) {
+            triggerDomEvent(event, data);
+        }
+
+        // no handlers, so skip it all
+        var handlers = this.handlers[event] && this.handlers[event].slice();
+        if (!handlers || !handlers.length) {
+            return;
+        }
+
+        data.type = event;
+        data.preventDefault = function() {
+            data.srcEvent.preventDefault();
+        };
+
+        var i = 0;
+        while (i < handlers.length) {
+            handlers[i](data);
+            i++;
+        }
+    },
+
+    /**
+     * destroy the manager and unbinds all events
+     * it doesn't unbind dom events, that is the user own responsibility
+     */
+    destroy: function() {
+        this.element && toggleCssProps(this, false);
+
+        this.handlers = {};
+        this.session = {};
+        this.input.destroy();
+        this.element = null;
+    }
+};
+
+/**
+ * add/remove the css properties as defined in manager.options.cssProps
+ * @param {Manager} manager
+ * @param {Boolean} add
+ */
+function toggleCssProps(manager, add) {
+    var element = manager.element;
+    if (!element.style) {
+        return;
+    }
+    var prop;
+    each(manager.options.cssProps, function(value, name) {
+        prop = prefixed(element.style, name);
+        if (add) {
+            manager.oldCssProps[prop] = element.style[prop];
+            element.style[prop] = value;
+        } else {
+            element.style[prop] = manager.oldCssProps[prop] || '';
+        }
+    });
+    if (!add) {
+        manager.oldCssProps = {};
+    }
+}
+
+/**
+ * trigger dom event
+ * @param {String} event
+ * @param {Object} data
+ */
+function triggerDomEvent(event, data) {
+    var gestureEvent = document.createEvent('Event');
+    gestureEvent.initEvent(event, true, true);
+    gestureEvent.gesture = data;
+    data.target.dispatchEvent(gestureEvent);
+}
+
+assign(Hammer, {
+    INPUT_START: INPUT_START,
+    INPUT_MOVE: INPUT_MOVE,
+    INPUT_END: INPUT_END,
+    INPUT_CANCEL: INPUT_CANCEL,
+
+    STATE_POSSIBLE: STATE_POSSIBLE,
+    STATE_BEGAN: STATE_BEGAN,
+    STATE_CHANGED: STATE_CHANGED,
+    STATE_ENDED: STATE_ENDED,
+    STATE_RECOGNIZED: STATE_RECOGNIZED,
+    STATE_CANCELLED: STATE_CANCELLED,
+    STATE_FAILED: STATE_FAILED,
+
+    DIRECTION_NONE: DIRECTION_NONE,
+    DIRECTION_LEFT: DIRECTION_LEFT,
+    DIRECTION_RIGHT: DIRECTION_RIGHT,
+    DIRECTION_UP: DIRECTION_UP,
+    DIRECTION_DOWN: DIRECTION_DOWN,
+    DIRECTION_HORIZONTAL: DIRECTION_HORIZONTAL,
+    DIRECTION_VERTICAL: DIRECTION_VERTICAL,
+    DIRECTION_ALL: DIRECTION_ALL,
+
+    Manager: Manager,
+    Input: Input,
+    TouchAction: TouchAction,
+
+    TouchInput: TouchInput,
+    MouseInput: MouseInput,
+    PointerEventInput: PointerEventInput,
+    TouchMouseInput: TouchMouseInput,
+    SingleTouchInput: SingleTouchInput,
+
+    Recognizer: Recognizer,
+    AttrRecognizer: AttrRecognizer,
+    Tap: TapRecognizer,
+    Pan: PanRecognizer,
+    Swipe: SwipeRecognizer,
+    Pinch: PinchRecognizer,
+    Rotate: RotateRecognizer,
+    Press: PressRecognizer,
+
+    on: addEventListeners,
+    off: removeEventListeners,
+    each: each,
+    merge: merge,
+    extend: extend,
+    assign: assign,
+    inherit: inherit,
+    bindFn: bindFn,
+    prefixed: prefixed
+});
+
+// this prevents errors when Hammer is loaded in the presence of an AMD
+//  style loader but by script tag, not by the loader.
+var freeGlobal = (typeof window !== 'undefined' ? window : (typeof self !== 'undefined' ? self : {})); // jshint ignore:line
+freeGlobal.Hammer = Hammer;
+
+if (typeof define === 'function' && define.amd) {
+    define(function() {
+        return Hammer;
+    });
+} else if (typeof module != 'undefined' && module.exports) {
+    module.exports = Hammer;
+} else {
+    window[exportName] = Hammer;
+}
+
+})(window, document, 'Hammer');
diff --git a/static/js/hammer.min.js b/static/js/hammer.min.js
new file mode 100644
index 0000000..34a8c86
--- /dev/null
+++ b/static/js/hammer.min.js
@@ -0,0 +1,7 @@
+/*! Hammer.JS - v2.0.7 - 2016-04-22
+ * http://hammerjs.github.io/
+ *
+ * Copyright (c) 2016 Jorik Tangelder;
+ * Licensed under the MIT license */
+!function(a,b,c,d){"use strict";function e(a,b,c){return setTimeout(j(a,c),b)}function f(a,b,c){return Array.isArray(a)?(g(a,c[b],c),!0):!1}function g(a,b,c){var e;if(a)if(a.forEach)a.forEach(b,c);else if(a.length!==d)for(e=0;e<a.length;)b.call(c,a[e],e,a),e++;else for(e in a)a.hasOwnProperty(e)&&b.call(c,a[e],e,a)}function h(b,c,d){var e="DEPRECATED METHOD: "+c+"\n"+d+" AT \n";return function(){var c=new Error("get-stack-trace"),d=c&&c.stack?c.stack.replace(/^[^\(]+?[\n$]/gm,"").replace(/^\s+at\s+/gm,"").replace(/^Object.<anonymous>\s*\(/gm,"{anonymous}()@"):"Unknown Stack Trace",f=a.console&&(a.console.warn||a.console.log);return f&&f.call(a.console,e,d),b.apply(this,arguments)}}function i(a,b,c){var d,e=b.prototype;d=a.prototype=Object.create(e),d.constructor=a,d._super=e,c&&la(d,c)}function j(a,b){return function(){return a.apply(b,arguments)}}function k(a,b){return typeof a==oa?a.apply(b?b[0]||d:d,b):a}function l(a,b){return a===d?b:a}function 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c=this;this.manager=a,this.callback=b,this.element=a.element,this.target=a.options.inputTarget,this.domHandler=function(b){k(a.options.enable,[a])&&c.handler(b)},this.init()}function y(a){var b,c=a.options.inputClass;return new(b=c?c:xa?M:ya?P:wa?R:L)(a,z)}function z(a,b,c){var d=c.pointers.length,e=c.changedPointers.length,f=b&Ea&&d-e===0,g=b&(Ga|Ha)&&d-e===0;c.isFirst=!!f,c.isFinal=!!g,f&&(a.session={}),c.eventType=b,A(a,c),a.emit("hammer.input",c),a.recognize(c),a.session.prevInput=c}function A(a,b){var c=a.session,d=b.pointers,e=d.length;c.firstInput||(c.firstInput=D(b)),e>1&&!c.firstMultiple?c.firstMultiple=D(b):1===e&&(c.firstMultiple=!1);var f=c.firstInput,g=c.firstMultiple,h=g?g.center:f.center,i=b.center=E(d);b.timeStamp=ra(),b.deltaTime=b.timeStamp-f.timeStamp,b.angle=I(h,i),b.distance=H(h,i),B(c,b),b.offsetDirection=G(b.deltaX,b.deltaY);var 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diff --git a/static/js/hammer.min.js.map b/static/js/hammer.min.js.map
new file mode 100644
index 0000000..2fa0e32
--- /dev/null
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\ No newline at end of file
diff --git a/static/js/hammer.min.map b/static/js/hammer.min.map
new file mode 100644
index 0000000..91d29e5
--- /dev/null
+++ b/static/js/hammer.min.map
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\ No newline at end of file
diff --git a/static/reveal.js/LICENSE b/static/reveal.js/LICENSE
new file mode 100644
index 0000000..d15cf3b
--- /dev/null
+++ b/static/reveal.js/LICENSE
@@ -0,0 +1,19 @@
+Copyright (C) 2020 Hakim El Hattab, http://hakim.se, and reveal.js contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
\ No newline at end of file
diff --git a/static/reveal.js/css/print/paper.css b/static/reveal.js/css/print/paper.css
new file mode 100644
index 0000000..27d19dd
--- /dev/null
+++ b/static/reveal.js/css/print/paper.css
@@ -0,0 +1,203 @@
+/* Default Print Stylesheet Template
+   by Rob Glazebrook of CSSnewbie.com
+   Last Updated: June 4, 2008
+
+   Feel free (nay, compelled) to edit, append, and
+   manipulate this file as you see fit. */
+
+
+@media print {
+
+	/* SECTION 1: Set default width, margin, float, and
+	   background. This prevents elements from extending
+	   beyond the edge of the printed page, and prevents
+	   unnecessary background images from printing */
+	html {
+		background: #fff;
+		width: auto;
+		height: auto;
+		overflow: visible;
+	}
+	body {
+		background: #fff;
+		font-size: 20pt;
+		width: auto;
+		height: auto;
+		border: 0;
+		margin: 0 5%;
+		padding: 0;
+		overflow: visible;
+		float: none !important;
+	}
+
+	/* SECTION 2: Remove any elements not needed in print.
+	   This would include navigation, ads, sidebars, etc. */
+	.nestedarrow,
+	.controls,
+	.fork-reveal,
+	.share-reveal,
+	.state-background,
+	.reveal .progress,
+	.reveal .backgrounds,
+	.reveal .slide-number {
+		display: none !important;
+	}
+
+	/* SECTION 3: Set body font face, size, and color.
+	   Consider using a serif font for readability. */
+	body, p, td, li, div {
+		font-size: 20pt!important;
+		font-family: Georgia, "Times New Roman", Times, serif !important;
+		color: #000;
+	}
+
+	/* SECTION 4: Set heading font face, sizes, and color.
+	   Differentiate your headings from your body text.
+	   Perhaps use a large sans-serif for distinction. */
+	h1,h2,h3,h4,h5,h6 {
+		color: #000!important;
+		height: auto;
+		line-height: normal;
+		font-family: Georgia, "Times New Roman", Times, serif !important;
+		text-shadow: 0 0 0 #000 !important;
+		text-align: left;
+		letter-spacing: normal;
+	}
+	/* Need to reduce the size of the fonts for printing */
+	h1 { font-size: 28pt !important;  }
+	h2 { font-size: 24pt !important; }
+	h3 { font-size: 22pt !important; }
+	h4 { font-size: 22pt !important; font-variant: small-caps; }
+	h5 { font-size: 21pt !important; }
+	h6 { font-size: 20pt !important; font-style: italic; }
+
+	/* SECTION 5: Make hyperlinks more usable.
+	   Ensure links are underlined, and consider appending
+	   the URL to the end of the link for usability. */
+	a:link,
+	a:visited {
+		color: #000 !important;
+		font-weight: bold;
+		text-decoration: underline;
+	}
+	/*
+	.reveal a:link:after,
+	.reveal a:visited:after {
+		content: " (" attr(href) ") ";
+		color: #222 !important;
+		font-size: 90%;
+	}
+	*/
+
+
+	/* SECTION 6: more reveal.js specific additions by @skypanther */
+	ul, ol, div, p {
+		visibility: visible;
+		position: static;
+		width: auto;
+		height: auto;
+		display: block;
+		overflow: visible;
+		margin: 0;
+		text-align: left !important;
+	}
+	.reveal pre,
+	.reveal table {
+		margin-left: 0;
+		margin-right: 0;
+	}
+	.reveal pre code {
+		padding: 20px;
+		border: 1px solid #ddd;
+	}
+	.reveal blockquote {
+		margin: 20px 0;
+	}
+	.reveal .slides {
+		position: static !important;
+		width: auto !important;
+		height: auto !important;
+
+		left: 0 !important;
+		top: 0 !important;
+		margin-left: 0 !important;
+		margin-top: 0 !important;
+		padding: 0 !important;
+		zoom: 1 !important;
+
+		overflow: visible !important;
+		display: block !important;
+
+		text-align: left !important;
+		-webkit-perspective: none;
+		   -moz-perspective: none;
+		    -ms-perspective: none;
+		        perspective: none;
+
+		-webkit-perspective-origin: 50% 50%;
+		   -moz-perspective-origin: 50% 50%;
+		    -ms-perspective-origin: 50% 50%;
+		        perspective-origin: 50% 50%;
+	}
+	.reveal .slides section {
+		visibility: visible !important;
+		position: static !important;
+		width: auto !important;
+		height: auto !important;
+		display: block !important;
+		overflow: visible !important;
+
+		left: 0 !important;
+		top: 0 !important;
+		margin-left: 0 !important;
+		margin-top: 0 !important;
+		padding: 60px 20px !important;
+		z-index: auto !important;
+
+		opacity: 1 !important;
+
+		page-break-after: always !important;
+
+		-webkit-transform-style: flat !important;
+		   -moz-transform-style: flat !important;
+		    -ms-transform-style: flat !important;
+		        transform-style: flat !important;
+
+		-webkit-transform: none !important;
+		   -moz-transform: none !important;
+		    -ms-transform: none !important;
+		        transform: none !important;
+
+		-webkit-transition: none !important;
+		   -moz-transition: none !important;
+		    -ms-transition: none !important;
+		        transition: none !important;
+	}
+	.reveal .slides section.stack {
+		padding: 0 !important;
+	}
+	.reveal section:last-of-type {
+		page-break-after: avoid !important;
+	}
+	.reveal section .fragment {
+		opacity: 1 !important;
+		visibility: visible !important;
+
+		-webkit-transform: none !important;
+		   -moz-transform: none !important;
+		    -ms-transform: none !important;
+		        transform: none !important;
+	}
+	.reveal section img {
+		display: block;
+		margin: 15px 0px;
+		background: rgba(255,255,255,1);
+		border: 1px solid #666;
+		box-shadow: none;
+	}
+
+	.reveal section small {
+		font-size: 0.8em;
+	}
+
+}
diff --git a/static/reveal.js/css/print/pdf.css b/static/reveal.js/css/print/pdf.css
new file mode 100644
index 0000000..752d955
--- /dev/null
+++ b/static/reveal.js/css/print/pdf.css
@@ -0,0 +1,164 @@
+/**
+ * This stylesheet is used to print reveal.js
+ * presentations to PDF.
+ *
+ * https://github.com/hakimel/reveal.js#pdf-export
+ */
+
+* {
+	-webkit-print-color-adjust: exact;
+}
+
+body {
+	margin: 0 auto !important;
+	border: 0;
+	padding: 0;
+	float: none !important;
+	overflow: visible;
+}
+
+html {
+	width: 100%;
+	height: 100%;
+	overflow: visible;
+}
+
+/* Remove any elements not needed in print. */
+.nestedarrow,
+.reveal .controls,
+.reveal .progress,
+.reveal .playback,
+.reveal.overview,
+.fork-reveal,
+.share-reveal,
+.state-background {
+	display: none !important;
+}
+
+h1, h2, h3, h4, h5, h6 {
+	text-shadow: 0 0 0 #000 !important;
+}
+
+.reveal pre code {
+	overflow: hidden !important;
+	font-family: Courier, 'Courier New', monospace !important;
+}
+
+ul, ol, div, p {
+	visibility: visible;
+	position: static;
+	width: auto;
+	height: auto;
+	display: block;
+	overflow: visible;
+	margin: auto;
+}
+.reveal {
+	width: auto !important;
+	height: auto !important;
+	overflow: hidden !important;
+}
+.reveal .slides {
+	position: static;
+	width: 100% !important;
+	height: auto !important;
+	zoom: 1 !important;
+
+	left: auto;
+	top: auto;
+	margin: 0 !important;
+	padding: 0 !important;
+
+	overflow: visible;
+	display: block;
+
+	perspective: none;
+	perspective-origin: 50% 50%;
+}
+
+.reveal .slides .pdf-page {
+	position: relative;
+	overflow: hidden;
+	z-index: 1;
+
+	page-break-after: always;
+}
+
+.reveal .slides section {
+	visibility: visible !important;
+	display: block !important;
+	position: absolute !important;
+
+	margin: 0 !important;
+	padding: 0 !important;
+	box-sizing: border-box !important;
+	min-height: 1px;
+
+	opacity: 1 !important;
+
+	transform-style: flat !important;
+	transform: none !important;
+}
+
+.reveal section.stack {
+	position: relative !important;
+	margin: 0 !important;
+	padding: 0 !important;
+	page-break-after: avoid !important;
+	height: auto !important;
+	min-height: auto !important;
+}
+
+.reveal img {
+	box-shadow: none;
+}
+
+.reveal .roll {
+	overflow: visible;
+	line-height: 1em;
+}
+
+/* Slide backgrounds are placed inside of their slide when exporting to PDF */
+.reveal .slide-background {
+	display: block !important;
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	z-index: auto !important;
+}
+
+/* Display slide speaker notes when 'showNotes' is enabled */
+.reveal.show-notes {
+	max-width: none;
+	max-height: none;
+}
+.reveal .speaker-notes-pdf {
+	display: block;
+	width: 100%;
+	height: auto;
+	max-height: none;
+	top: auto;
+	right: auto;
+	bottom: auto;
+	left: auto;
+	z-index: 100;
+}
+
+/* Layout option which makes notes appear on a separate page */
+.reveal .speaker-notes-pdf[data-layout="separate-page"] {
+	position: relative;
+	color: inherit;
+	background-color: transparent;
+	padding: 20px;
+	page-break-after: always;
+	border: 0;
+}
+
+/* Display slide numbers when 'slideNumber' is enabled */
+.reveal .slide-number-pdf {
+	display: block;
+	position: absolute;
+	font-size: 14px;
+}
diff --git a/static/reveal.js/css/reset.css b/static/reveal.js/css/reset.css
new file mode 100644
index 0000000..e238539
--- /dev/null
+++ b/static/reveal.js/css/reset.css
@@ -0,0 +1,30 @@
+/* http://meyerweb.com/eric/tools/css/reset/
+   v4.0 | 20180602
+   License: none (public domain)
+*/
+
+html, body, div, span, applet, object, iframe,
+h1, h2, h3, h4, h5, h6, p, blockquote, pre,
+a, abbr, acronym, address, big, cite, code,
+del, dfn, em, img, ins, kbd, q, s, samp,
+small, strike, strong, sub, sup, tt, var,
+b, u, i, center,
+dl, dt, dd, ol, ul, li,
+fieldset, form, label, legend,
+table, caption, tbody, tfoot, thead, tr, th, td,
+article, aside, canvas, details, embed,
+figure, figcaption, footer, header, hgroup,
+main, menu, nav, output, ruby, section, summary,
+time, mark, audio, video {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-size: 100%;
+  font: inherit;
+  vertical-align: baseline;
+}
+/* HTML5 display-role reset for older browsers */
+article, aside, details, figcaption, figure,
+footer, header, hgroup, main, menu, nav, section {
+  display: block;
+}
\ No newline at end of file
diff --git a/static/reveal.js/css/reveal.css b/static/reveal.js/css/reveal.css
new file mode 100644
index 0000000..0ca77e7
--- /dev/null
+++ b/static/reveal.js/css/reveal.css
@@ -0,0 +1,1606 @@
+/*!
+ * reveal.js
+ * http://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+ */
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+html {
+  width: 100%;
+  height: 100%;
+  height: 100vh;
+  height: calc( var(--vh, 1vh) * 100);
+  overflow: hidden; }
+
+body {
+  height: 100%;
+  overflow: hidden;
+  position: relative;
+  line-height: 1;
+  margin: 0;
+  background-color: #fff;
+  color: #000; }
+
+/*********************************************
+ * VIEW FRAGMENTS
+ *********************************************/
+.reveal .slides section .fragment {
+  opacity: 0;
+  visibility: hidden;
+  transition: all .2s ease; }
+  .reveal .slides section .fragment.visible {
+    opacity: 1;
+    visibility: inherit; }
+
+.reveal .slides section .fragment.grow {
+  opacity: 1;
+  visibility: inherit; }
+  .reveal .slides section .fragment.grow.visible {
+    -webkit-transform: scale(1.3);
+            transform: scale(1.3); }
+
+.reveal .slides section .fragment.shrink {
+  opacity: 1;
+  visibility: inherit; }
+  .reveal .slides section .fragment.shrink.visible {
+    -webkit-transform: scale(0.7);
+            transform: scale(0.7); }
+
+.reveal .slides section .fragment.zoom-in {
+  -webkit-transform: scale(0.1);
+          transform: scale(0.1); }
+  .reveal .slides section .fragment.zoom-in.visible {
+    -webkit-transform: none;
+            transform: none; }
+
+.reveal .slides section .fragment.fade-out {
+  opacity: 1;
+  visibility: inherit; }
+  .reveal .slides section .fragment.fade-out.visible {
+    opacity: 0;
+    visibility: hidden; }
+
+.reveal .slides section .fragment.semi-fade-out {
+  opacity: 1;
+  visibility: inherit; }
+  .reveal .slides section .fragment.semi-fade-out.visible {
+    opacity: 0.5;
+    visibility: inherit; }
+
+.reveal .slides section .fragment.strike {
+  opacity: 1;
+  visibility: inherit; }
+  .reveal .slides section .fragment.strike.visible {
+    text-decoration: line-through; }
+
+.reveal .slides section .fragment.fade-up {
+  -webkit-transform: translate(0, 40px);
+          transform: translate(0, 40px); }
+  .reveal .slides section .fragment.fade-up.visible {
+    -webkit-transform: translate(0, 0);
+            transform: translate(0, 0); }
+
+.reveal .slides section .fragment.fade-down {
+  -webkit-transform: translate(0, -40px);
+          transform: translate(0, -40px); }
+  .reveal .slides section .fragment.fade-down.visible {
+    -webkit-transform: translate(0, 0);
+            transform: translate(0, 0); }
+
+.reveal .slides section .fragment.fade-right {
+  -webkit-transform: translate(-40px, 0);
+          transform: translate(-40px, 0); }
+  .reveal .slides section .fragment.fade-right.visible {
+    -webkit-transform: translate(0, 0);
+            transform: translate(0, 0); }
+
+.reveal .slides section .fragment.fade-left {
+  -webkit-transform: translate(40px, 0);
+          transform: translate(40px, 0); }
+  .reveal .slides section .fragment.fade-left.visible {
+    -webkit-transform: translate(0, 0);
+            transform: translate(0, 0); }
+
+.reveal .slides section .fragment.fade-in-then-out,
+.reveal .slides section .fragment.current-visible {
+  opacity: 0;
+  visibility: hidden; }
+  .reveal .slides section .fragment.fade-in-then-out.current-fragment,
+  .reveal .slides section .fragment.current-visible.current-fragment {
+    opacity: 1;
+    visibility: inherit; }
+
+.reveal .slides section .fragment.fade-in-then-semi-out {
+  opacity: 0;
+  visibility: hidden; }
+  .reveal .slides section .fragment.fade-in-then-semi-out.visible {
+    opacity: 0.5;
+    visibility: inherit; }
+  .reveal .slides section .fragment.fade-in-then-semi-out.current-fragment {
+    opacity: 1;
+    visibility: inherit; }
+
+.reveal .slides section .fragment.highlight-red,
+.reveal .slides section .fragment.highlight-current-red,
+.reveal .slides section .fragment.highlight-green,
+.reveal .slides section .fragment.highlight-current-green,
+.reveal .slides section .fragment.highlight-blue,
+.reveal .slides section .fragment.highlight-current-blue {
+  opacity: 1;
+  visibility: inherit; }
+
+.reveal .slides section .fragment.highlight-red.visible {
+  color: #ff2c2d; }
+
+.reveal .slides section .fragment.highlight-green.visible {
+  color: #17ff2e; }
+
+.reveal .slides section .fragment.highlight-blue.visible {
+  color: #1b91ff; }
+
+.reveal .slides section .fragment.highlight-current-red.current-fragment {
+  color: #ff2c2d; }
+
+.reveal .slides section .fragment.highlight-current-green.current-fragment {
+  color: #17ff2e; }
+
+.reveal .slides section .fragment.highlight-current-blue.current-fragment {
+  color: #1b91ff; }
+
+/*********************************************
+ * DEFAULT ELEMENT STYLES
+ *********************************************/
+/* Fixes issue in Chrome where italic fonts did not appear when printing to PDF */
+.reveal:after {
+  content: '';
+  font-style: italic; }
+
+.reveal iframe {
+  z-index: 1; }
+
+/** Prevents layering issues in certain browser/transition combinations */
+.reveal a {
+  position: relative; }
+
+.reveal .stretch {
+  max-width: none;
+  max-height: none; }
+
+.reveal pre.stretch code {
+  height: 100%;
+  max-height: 100%;
+  box-sizing: border-box; }
+
+/*********************************************
+ * CONTROLS
+ *********************************************/
+@-webkit-keyframes bounce-right {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateX(0);
+            transform: translateX(0); }
+  20% {
+    -webkit-transform: translateX(10px);
+            transform: translateX(10px); }
+  30% {
+    -webkit-transform: translateX(-5px);
+            transform: translateX(-5px); } }
+@keyframes bounce-right {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateX(0);
+            transform: translateX(0); }
+  20% {
+    -webkit-transform: translateX(10px);
+            transform: translateX(10px); }
+  30% {
+    -webkit-transform: translateX(-5px);
+            transform: translateX(-5px); } }
+
+@-webkit-keyframes bounce-down {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateY(0);
+            transform: translateY(0); }
+  20% {
+    -webkit-transform: translateY(10px);
+            transform: translateY(10px); }
+  30% {
+    -webkit-transform: translateY(-5px);
+            transform: translateY(-5px); } }
+
+@keyframes bounce-down {
+  0%, 10%, 25%, 40%, 50% {
+    -webkit-transform: translateY(0);
+            transform: translateY(0); }
+  20% {
+    -webkit-transform: translateY(10px);
+            transform: translateY(10px); }
+  30% {
+    -webkit-transform: translateY(-5px);
+            transform: translateY(-5px); } }
+
+.reveal .controls {
+  display: none;
+  position: absolute;
+  top: auto;
+  bottom: 12px;
+  right: 12px;
+  left: auto;
+  z-index: 11;
+  color: #000;
+  pointer-events: none;
+  font-size: 10px; }
+  .reveal .controls button {
+    position: absolute;
+    padding: 0;
+    background-color: transparent;
+    border: 0;
+    outline: 0;
+    cursor: pointer;
+    color: currentColor;
+    -webkit-transform: scale(0.9999);
+            transform: scale(0.9999);
+    transition: color 0.2s ease, opacity 0.2s ease, -webkit-transform 0.2s ease;
+    transition: color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
+    z-index: 2;
+    pointer-events: auto;
+    font-size: inherit;
+    visibility: hidden;
+    opacity: 0;
+    -webkit-appearance: none;
+    -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }
+  .reveal .controls .controls-arrow:before,
+  .reveal .controls .controls-arrow:after {
+    content: '';
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 2.6em;
+    height: 0.5em;
+    border-radius: 0.25em;
+    background-color: currentColor;
+    transition: all 0.15s ease, background-color 0.8s ease;
+    -webkit-transform-origin: 0.2em 50%;
+            transform-origin: 0.2em 50%;
+    will-change: transform; }
+  .reveal .controls .controls-arrow {
+    position: relative;
+    width: 3.6em;
+    height: 3.6em; }
+    .reveal .controls .controls-arrow:before {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(45deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(45deg); }
+    .reveal .controls .controls-arrow:after {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(-45deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(-45deg); }
+    .reveal .controls .controls-arrow:hover:before {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(40deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(40deg); }
+    .reveal .controls .controls-arrow:hover:after {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(-40deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(-40deg); }
+    .reveal .controls .controls-arrow:active:before {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(36deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(36deg); }
+    .reveal .controls .controls-arrow:active:after {
+      -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(-36deg);
+              transform: translateX(0.5em) translateY(1.55em) rotate(-36deg); }
+  .reveal .controls .navigate-left {
+    right: 6.4em;
+    bottom: 3.2em;
+    -webkit-transform: translateX(-10px);
+            transform: translateX(-10px); }
+  .reveal .controls .navigate-right {
+    right: 0;
+    bottom: 3.2em;
+    -webkit-transform: translateX(10px);
+            transform: translateX(10px); }
+    .reveal .controls .navigate-right .controls-arrow {
+      -webkit-transform: rotate(180deg);
+              transform: rotate(180deg); }
+    .reveal .controls .navigate-right.highlight {
+      -webkit-animation: bounce-right 2s 50 both ease-out;
+              animation: bounce-right 2s 50 both ease-out; }
+  .reveal .controls .navigate-up {
+    right: 3.2em;
+    bottom: 6.4em;
+    -webkit-transform: translateY(-10px);
+            transform: translateY(-10px); }
+    .reveal .controls .navigate-up .controls-arrow {
+      -webkit-transform: rotate(90deg);
+              transform: rotate(90deg); }
+  .reveal .controls .navigate-down {
+    right: 3.2em;
+    bottom: -1.4em;
+    padding-bottom: 1.4em;
+    -webkit-transform: translateY(10px);
+            transform: translateY(10px); }
+    .reveal .controls .navigate-down .controls-arrow {
+      -webkit-transform: rotate(-90deg);
+              transform: rotate(-90deg); }
+    .reveal .controls .navigate-down.highlight {
+      -webkit-animation: bounce-down 2s 50 both ease-out;
+              animation: bounce-down 2s 50 both ease-out; }
+  .reveal .controls[data-controls-back-arrows="faded"] .navigate-left.enabled,
+  .reveal .controls[data-controls-back-arrows="faded"] .navigate-up.enabled {
+    opacity: 0.3; }
+    .reveal .controls[data-controls-back-arrows="faded"] .navigate-left.enabled:hover,
+    .reveal .controls[data-controls-back-arrows="faded"] .navigate-up.enabled:hover {
+      opacity: 1; }
+  .reveal .controls[data-controls-back-arrows="hidden"] .navigate-left.enabled,
+  .reveal .controls[data-controls-back-arrows="hidden"] .navigate-up.enabled {
+    opacity: 0;
+    visibility: hidden; }
+  .reveal .controls .enabled {
+    visibility: visible;
+    opacity: 0.9;
+    cursor: pointer;
+    -webkit-transform: none;
+            transform: none; }
+  .reveal .controls .enabled.fragmented {
+    opacity: 0.5; }
+  .reveal .controls .enabled:hover,
+  .reveal .controls .enabled.fragmented:hover {
+    opacity: 1; }
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
+  display: none; }
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-left,
+.reveal:not(.has-vertical-slides) .controls .navigate-left {
+  bottom: 1.4em;
+  right: 5.5em; }
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-right,
+.reveal:not(.has-vertical-slides) .controls .navigate-right {
+  bottom: 1.4em;
+  right: 0.5em; }
+
+.reveal:not(.has-horizontal-slides) .controls .navigate-up {
+  right: 1.4em;
+  bottom: 5em; }
+
+.reveal:not(.has-horizontal-slides) .controls .navigate-down {
+  right: 1.4em;
+  bottom: 0.5em; }
+
+.reveal.has-dark-background .controls {
+  color: #fff; }
+
+.reveal.has-light-background .controls {
+  color: #000; }
+
+.reveal.no-hover .controls .controls-arrow:hover:before,
+.reveal.no-hover .controls .controls-arrow:active:before {
+  -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(45deg);
+          transform: translateX(0.5em) translateY(1.55em) rotate(45deg); }
+
+.reveal.no-hover .controls .controls-arrow:hover:after,
+.reveal.no-hover .controls .controls-arrow:active:after {
+  -webkit-transform: translateX(0.5em) translateY(1.55em) rotate(-45deg);
+          transform: translateX(0.5em) translateY(1.55em) rotate(-45deg); }
+
+@media screen and (min-width: 500px) {
+  .reveal .controls[data-controls-layout="edges"] {
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0; }
+  .reveal .controls[data-controls-layout="edges"] .navigate-left,
+  .reveal .controls[data-controls-layout="edges"] .navigate-right,
+  .reveal .controls[data-controls-layout="edges"] .navigate-up,
+  .reveal .controls[data-controls-layout="edges"] .navigate-down {
+    bottom: auto;
+    right: auto; }
+  .reveal .controls[data-controls-layout="edges"] .navigate-left {
+    top: 50%;
+    left: 0.8em;
+    margin-top: -1.8em; }
+  .reveal .controls[data-controls-layout="edges"] .navigate-right {
+    top: 50%;
+    right: 0.8em;
+    margin-top: -1.8em; }
+  .reveal .controls[data-controls-layout="edges"] .navigate-up {
+    top: 0.8em;
+    left: 50%;
+    margin-left: -1.8em; }
+  .reveal .controls[data-controls-layout="edges"] .navigate-down {
+    bottom: -0.3em;
+    left: 50%;
+    margin-left: -1.8em; } }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  position: absolute;
+  display: none;
+  height: 3px;
+  width: 100%;
+  bottom: 0;
+  left: 0;
+  z-index: 10;
+  background-color: rgba(0, 0, 0, 0.2);
+  color: #fff; }
+
+.reveal .progress:after {
+  content: '';
+  display: block;
+  position: absolute;
+  height: 10px;
+  width: 100%;
+  top: -10px; }
+
+.reveal .progress span {
+  display: block;
+  height: 100%;
+  width: 0px;
+  background-color: currentColor;
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * SLIDE NUMBER
+ *********************************************/
+.reveal .slide-number {
+  position: absolute;
+  display: block;
+  right: 8px;
+  bottom: 8px;
+  z-index: 31;
+  font-family: Helvetica, sans-serif;
+  font-size: 12px;
+  line-height: 1;
+  color: #fff;
+  background-color: rgba(0, 0, 0, 0.4);
+  padding: 5px; }
+
+.reveal .slide-number a {
+  color: currentColor; }
+
+.reveal .slide-number-delimiter {
+  margin: 0 3px; }
+
+/*********************************************
+ * SLIDES
+ *********************************************/
+.reveal {
+  position: relative;
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+  -ms-touch-action: pinch-zoom;
+      touch-action: pinch-zoom; }
+
+.reveal .slides {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  margin: auto;
+  pointer-events: none;
+  overflow: visible;
+  z-index: 1;
+  text-align: center;
+  -webkit-perspective: 600px;
+          perspective: 600px;
+  -webkit-perspective-origin: 50% 40%;
+          perspective-origin: 50% 40%; }
+
+.reveal .slides > section {
+  -webkit-perspective: 600px;
+          perspective: 600px; }
+
+.reveal .slides > section,
+.reveal .slides > section > section {
+  display: none;
+  position: absolute;
+  width: 100%;
+  padding: 20px 0px;
+  pointer-events: auto;
+  z-index: 10;
+  -webkit-transform-style: flat;
+          transform-style: flat;
+  transition: -webkit-transform-origin 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), -webkit-transform 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), visibility 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), opacity 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: transform-origin 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), transform 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), visibility 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985), opacity 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/* Global transition speed settings */
+.reveal[data-transition-speed="fast"] .slides section {
+  transition-duration: 400ms; }
+
+.reveal[data-transition-speed="slow"] .slides section {
+  transition-duration: 1200ms; }
+
+/* Slide-specific transition speed overrides */
+.reveal .slides section[data-transition-speed="fast"] {
+  transition-duration: 400ms; }
+
+.reveal .slides section[data-transition-speed="slow"] {
+  transition-duration: 1200ms; }
+
+.reveal .slides > section.stack {
+  padding-top: 0;
+  padding-bottom: 0;
+  pointer-events: none;
+  height: 100%; }
+
+.reveal .slides > section.present,
+.reveal .slides > section > section.present {
+  display: block;
+  z-index: 11;
+  opacity: 1; }
+
+.reveal .slides > section:empty,
+.reveal .slides > section > section:empty,
+.reveal .slides > section[data-background-interactive],
+.reveal .slides > section > section[data-background-interactive] {
+  pointer-events: none; }
+
+.reveal.center,
+.reveal.center .slides,
+.reveal.center .slides section {
+  min-height: 0 !important; }
+
+/* Don't allow interaction with invisible slides */
+.reveal .slides > section.future,
+.reveal .slides > section > section.future,
+.reveal .slides > section.past,
+.reveal .slides > section > section.past {
+  pointer-events: none; }
+
+.reveal.overview .slides > section,
+.reveal.overview .slides > section > section {
+  pointer-events: auto; }
+
+.reveal .slides > section.past,
+.reveal .slides > section.future,
+.reveal .slides > section > section.past,
+.reveal .slides > section > section.future {
+  opacity: 0; }
+
+/*********************************************
+ * Mixins for readability of transitions
+ *********************************************/
+/*********************************************
+ * SLIDE TRANSITION
+ * Aliased 'linear' for backwards compatibility
+ *********************************************/
+.reveal.slide section {
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden; }
+
+.reveal .slides > section[data-transition=slide].past,
+.reveal .slides > section[data-transition~=slide-out].past,
+.reveal.slide .slides > section:not([data-transition]).past {
+  -webkit-transform: translate(-150%, 0);
+          transform: translate(-150%, 0); }
+
+.reveal .slides > section[data-transition=slide].future,
+.reveal .slides > section[data-transition~=slide-in].future,
+.reveal.slide .slides > section:not([data-transition]).future {
+  -webkit-transform: translate(150%, 0);
+          transform: translate(150%, 0); }
+
+.reveal .slides > section > section[data-transition=slide].past,
+.reveal .slides > section > section[data-transition~=slide-out].past,
+.reveal.slide .slides > section > section:not([data-transition]).past {
+  -webkit-transform: translate(0, -150%);
+          transform: translate(0, -150%); }
+
+.reveal .slides > section > section[data-transition=slide].future,
+.reveal .slides > section > section[data-transition~=slide-in].future,
+.reveal.slide .slides > section > section:not([data-transition]).future {
+  -webkit-transform: translate(0, 150%);
+          transform: translate(0, 150%); }
+
+.reveal.linear section {
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden; }
+
+.reveal .slides > section[data-transition=linear].past,
+.reveal .slides > section[data-transition~=linear-out].past,
+.reveal.linear .slides > section:not([data-transition]).past {
+  -webkit-transform: translate(-150%, 0);
+          transform: translate(-150%, 0); }
+
+.reveal .slides > section[data-transition=linear].future,
+.reveal .slides > section[data-transition~=linear-in].future,
+.reveal.linear .slides > section:not([data-transition]).future {
+  -webkit-transform: translate(150%, 0);
+          transform: translate(150%, 0); }
+
+.reveal .slides > section > section[data-transition=linear].past,
+.reveal .slides > section > section[data-transition~=linear-out].past,
+.reveal.linear .slides > section > section:not([data-transition]).past {
+  -webkit-transform: translate(0, -150%);
+          transform: translate(0, -150%); }
+
+.reveal .slides > section > section[data-transition=linear].future,
+.reveal .slides > section > section[data-transition~=linear-in].future,
+.reveal.linear .slides > section > section:not([data-transition]).future {
+  -webkit-transform: translate(0, 150%);
+          transform: translate(0, 150%); }
+
+/*********************************************
+ * CONVEX TRANSITION
+ * Aliased 'default' for backwards compatibility
+ *********************************************/
+.reveal .slides section[data-transition=default].stack,
+.reveal.default .slides section.stack {
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d; }
+
+.reveal .slides > section[data-transition=default].past,
+.reveal .slides > section[data-transition~=default-out].past,
+.reveal.default .slides > section:not([data-transition]).past {
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0); }
+
+.reveal .slides > section[data-transition=default].future,
+.reveal .slides > section[data-transition~=default-in].future,
+.reveal.default .slides > section:not([data-transition]).future {
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0); }
+
+.reveal .slides > section > section[data-transition=default].past,
+.reveal .slides > section > section[data-transition~=default-out].past,
+.reveal.default .slides > section > section:not([data-transition]).past {
+  -webkit-transform: translate3d(0, -300px, 0) rotateX(70deg) translate3d(0, -300px, 0);
+          transform: translate3d(0, -300px, 0) rotateX(70deg) translate3d(0, -300px, 0); }
+
+.reveal .slides > section > section[data-transition=default].future,
+.reveal .slides > section > section[data-transition~=default-in].future,
+.reveal.default .slides > section > section:not([data-transition]).future {
+  -webkit-transform: translate3d(0, 300px, 0) rotateX(-70deg) translate3d(0, 300px, 0);
+          transform: translate3d(0, 300px, 0) rotateX(-70deg) translate3d(0, 300px, 0); }
+
+.reveal .slides section[data-transition=convex].stack,
+.reveal.convex .slides section.stack {
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d; }
+
+.reveal .slides > section[data-transition=convex].past,
+.reveal .slides > section[data-transition~=convex-out].past,
+.reveal.convex .slides > section:not([data-transition]).past {
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0); }
+
+.reveal .slides > section[data-transition=convex].future,
+.reveal .slides > section[data-transition~=convex-in].future,
+.reveal.convex .slides > section:not([data-transition]).future {
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0); }
+
+.reveal .slides > section > section[data-transition=convex].past,
+.reveal .slides > section > section[data-transition~=convex-out].past,
+.reveal.convex .slides > section > section:not([data-transition]).past {
+  -webkit-transform: translate3d(0, -300px, 0) rotateX(70deg) translate3d(0, -300px, 0);
+          transform: translate3d(0, -300px, 0) rotateX(70deg) translate3d(0, -300px, 0); }
+
+.reveal .slides > section > section[data-transition=convex].future,
+.reveal .slides > section > section[data-transition~=convex-in].future,
+.reveal.convex .slides > section > section:not([data-transition]).future {
+  -webkit-transform: translate3d(0, 300px, 0) rotateX(-70deg) translate3d(0, 300px, 0);
+          transform: translate3d(0, 300px, 0) rotateX(-70deg) translate3d(0, 300px, 0); }
+
+/*********************************************
+ * CONCAVE TRANSITION
+ *********************************************/
+.reveal .slides section[data-transition=concave].stack,
+.reveal.concave .slides section.stack {
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d; }
+
+.reveal .slides > section[data-transition=concave].past,
+.reveal .slides > section[data-transition~=concave-out].past,
+.reveal.concave .slides > section:not([data-transition]).past {
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0); }
+
+.reveal .slides > section[data-transition=concave].future,
+.reveal .slides > section[data-transition~=concave-in].future,
+.reveal.concave .slides > section:not([data-transition]).future {
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0); }
+
+.reveal .slides > section > section[data-transition=concave].past,
+.reveal .slides > section > section[data-transition~=concave-out].past,
+.reveal.concave .slides > section > section:not([data-transition]).past {
+  -webkit-transform: translate3d(0, -80%, 0) rotateX(-70deg) translate3d(0, -80%, 0);
+          transform: translate3d(0, -80%, 0) rotateX(-70deg) translate3d(0, -80%, 0); }
+
+.reveal .slides > section > section[data-transition=concave].future,
+.reveal .slides > section > section[data-transition~=concave-in].future,
+.reveal.concave .slides > section > section:not([data-transition]).future {
+  -webkit-transform: translate3d(0, 80%, 0) rotateX(70deg) translate3d(0, 80%, 0);
+          transform: translate3d(0, 80%, 0) rotateX(70deg) translate3d(0, 80%, 0); }
+
+/*********************************************
+ * ZOOM TRANSITION
+ *********************************************/
+.reveal .slides section[data-transition=zoom],
+.reveal.zoom .slides section:not([data-transition]) {
+  transition-timing-function: ease; }
+
+.reveal .slides > section[data-transition=zoom].past,
+.reveal .slides > section[data-transition~=zoom-out].past,
+.reveal.zoom .slides > section:not([data-transition]).past {
+  visibility: hidden;
+  -webkit-transform: scale(16);
+          transform: scale(16); }
+
+.reveal .slides > section[data-transition=zoom].future,
+.reveal .slides > section[data-transition~=zoom-in].future,
+.reveal.zoom .slides > section:not([data-transition]).future {
+  visibility: hidden;
+  -webkit-transform: scale(0.2);
+          transform: scale(0.2); }
+
+.reveal .slides > section > section[data-transition=zoom].past,
+.reveal .slides > section > section[data-transition~=zoom-out].past,
+.reveal.zoom .slides > section > section:not([data-transition]).past {
+  -webkit-transform: scale(16);
+          transform: scale(16); }
+
+.reveal .slides > section > section[data-transition=zoom].future,
+.reveal .slides > section > section[data-transition~=zoom-in].future,
+.reveal.zoom .slides > section > section:not([data-transition]).future {
+  -webkit-transform: scale(0.2);
+          transform: scale(0.2); }
+
+/*********************************************
+ * CUBE TRANSITION
+ *
+ * WARNING:
+ * this is deprecated and will be removed in a
+ * future version.
+ *********************************************/
+.reveal.cube .slides {
+  -webkit-perspective: 1300px;
+          perspective: 1300px; }
+
+.reveal.cube .slides section {
+  padding: 30px;
+  min-height: 700px;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden;
+  box-sizing: border-box;
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d; }
+
+.reveal.center.cube .slides section {
+  min-height: 0; }
+
+.reveal.cube .slides section:not(.stack):before {
+  content: '';
+  position: absolute;
+  display: block;
+  width: 100%;
+  height: 100%;
+  left: 0;
+  top: 0;
+  background: rgba(0, 0, 0, 0.1);
+  border-radius: 4px;
+  -webkit-transform: translateZ(-20px);
+          transform: translateZ(-20px); }
+
+.reveal.cube .slides section:not(.stack):after {
+  content: '';
+  position: absolute;
+  display: block;
+  width: 90%;
+  height: 30px;
+  left: 5%;
+  bottom: 0;
+  background: none;
+  z-index: 1;
+  border-radius: 4px;
+  box-shadow: 0px 95px 25px rgba(0, 0, 0, 0.2);
+  -webkit-transform: translateZ(-90px) rotateX(65deg);
+          transform: translateZ(-90px) rotateX(65deg); }
+
+.reveal.cube .slides > section.stack {
+  padding: 0;
+  background: none; }
+
+.reveal.cube .slides > section.past {
+  -webkit-transform-origin: 100% 0%;
+          transform-origin: 100% 0%;
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(-90deg);
+          transform: translate3d(-100%, 0, 0) rotateY(-90deg); }
+
+.reveal.cube .slides > section.future {
+  -webkit-transform-origin: 0% 0%;
+          transform-origin: 0% 0%;
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(90deg);
+          transform: translate3d(100%, 0, 0) rotateY(90deg); }
+
+.reveal.cube .slides > section > section.past {
+  -webkit-transform-origin: 0% 100%;
+          transform-origin: 0% 100%;
+  -webkit-transform: translate3d(0, -100%, 0) rotateX(90deg);
+          transform: translate3d(0, -100%, 0) rotateX(90deg); }
+
+.reveal.cube .slides > section > section.future {
+  -webkit-transform-origin: 0% 0%;
+          transform-origin: 0% 0%;
+  -webkit-transform: translate3d(0, 100%, 0) rotateX(-90deg);
+          transform: translate3d(0, 100%, 0) rotateX(-90deg); }
+
+/*********************************************
+ * PAGE TRANSITION
+ *
+ * WARNING:
+ * this is deprecated and will be removed in a
+ * future version.
+ *********************************************/
+.reveal.page .slides {
+  -webkit-perspective-origin: 0% 50%;
+          perspective-origin: 0% 50%;
+  -webkit-perspective: 3000px;
+          perspective: 3000px; }
+
+.reveal.page .slides section {
+  padding: 30px;
+  min-height: 700px;
+  box-sizing: border-box;
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d; }
+
+.reveal.page .slides section.past {
+  z-index: 12; }
+
+.reveal.page .slides section:not(.stack):before {
+  content: '';
+  position: absolute;
+  display: block;
+  width: 100%;
+  height: 100%;
+  left: 0;
+  top: 0;
+  background: rgba(0, 0, 0, 0.1);
+  -webkit-transform: translateZ(-20px);
+          transform: translateZ(-20px); }
+
+.reveal.page .slides section:not(.stack):after {
+  content: '';
+  position: absolute;
+  display: block;
+  width: 90%;
+  height: 30px;
+  left: 5%;
+  bottom: 0;
+  background: none;
+  z-index: 1;
+  border-radius: 4px;
+  box-shadow: 0px 95px 25px rgba(0, 0, 0, 0.2);
+  -webkit-transform: translateZ(-90px) rotateX(65deg); }
+
+.reveal.page .slides > section.stack {
+  padding: 0;
+  background: none; }
+
+.reveal.page .slides > section.past {
+  -webkit-transform-origin: 0% 0%;
+          transform-origin: 0% 0%;
+  -webkit-transform: translate3d(-40%, 0, 0) rotateY(-80deg);
+          transform: translate3d(-40%, 0, 0) rotateY(-80deg); }
+
+.reveal.page .slides > section.future {
+  -webkit-transform-origin: 100% 0%;
+          transform-origin: 100% 0%;
+  -webkit-transform: translate3d(0, 0, 0);
+          transform: translate3d(0, 0, 0); }
+
+.reveal.page .slides > section > section.past {
+  -webkit-transform-origin: 0% 0%;
+          transform-origin: 0% 0%;
+  -webkit-transform: translate3d(0, -40%, 0) rotateX(80deg);
+          transform: translate3d(0, -40%, 0) rotateX(80deg); }
+
+.reveal.page .slides > section > section.future {
+  -webkit-transform-origin: 0% 100%;
+          transform-origin: 0% 100%;
+  -webkit-transform: translate3d(0, 0, 0);
+          transform: translate3d(0, 0, 0); }
+
+/*********************************************
+ * FADE TRANSITION
+ *********************************************/
+.reveal .slides section[data-transition=fade],
+.reveal.fade .slides section:not([data-transition]),
+.reveal.fade .slides > section > section:not([data-transition]) {
+  -webkit-transform: none;
+          transform: none;
+  transition: opacity 0.5s; }
+
+.reveal.fade.overview .slides section,
+.reveal.fade.overview .slides > section > section {
+  transition: none; }
+
+/*********************************************
+ * NO TRANSITION
+ *********************************************/
+.reveal .slides section[data-transition=none],
+.reveal.none .slides section:not([data-transition]) {
+  -webkit-transform: none;
+          transform: none;
+  transition: none; }
+
+/*********************************************
+ * PAUSED MODE
+ *********************************************/
+.reveal .pause-overlay {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: black;
+  visibility: hidden;
+  opacity: 0;
+  z-index: 100;
+  transition: all 1s ease; }
+
+.reveal .pause-overlay .resume-button {
+  position: absolute;
+  bottom: 20px;
+  right: 20px;
+  color: #ccc;
+  border-radius: 2px;
+  padding: 6px 14px;
+  border: 2px solid #ccc;
+  font-size: 16px;
+  background: transparent;
+  cursor: pointer; }
+  .reveal .pause-overlay .resume-button:hover {
+    color: #fff;
+    border-color: #fff; }
+
+.reveal.paused .pause-overlay {
+  visibility: visible;
+  opacity: 1; }
+
+/*********************************************
+ * FALLBACK
+ *********************************************/
+.no-transforms {
+  overflow-y: auto; }
+
+.no-transforms .reveal {
+  overflow: visible; }
+
+.no-transforms .reveal .slides {
+  position: relative;
+  width: 80%;
+  max-width: 1280px;
+  height: auto;
+  top: 0;
+  margin: 0 auto;
+  text-align: center; }
+
+.no-transforms .reveal .controls,
+.no-transforms .reveal .progress {
+  display: none; }
+
+.no-transforms .reveal .slides section {
+  display: block;
+  opacity: 1;
+  position: relative;
+  height: auto;
+  min-height: 0;
+  top: 0;
+  left: 0;
+  margin: 10vh 0;
+  margin: 70px 0;
+  -webkit-transform: none;
+          transform: none; }
+
+.reveal .no-transition,
+.reveal .no-transition * {
+  transition: none !important; }
+
+/*********************************************
+ * PER-SLIDE BACKGROUNDS
+ *********************************************/
+.reveal .backgrounds {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  top: 0;
+  left: 0;
+  -webkit-perspective: 600px;
+          perspective: 600px; }
+
+.reveal .slide-background {
+  display: none;
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  opacity: 0;
+  visibility: hidden;
+  overflow: hidden;
+  background-color: rgba(0, 0, 0, 0);
+  transition: all 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+.reveal .slide-background-content {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  background-position: 50% 50%;
+  background-repeat: no-repeat;
+  background-size: cover; }
+
+.reveal .slide-background.stack {
+  display: block; }
+
+.reveal .slide-background.present {
+  opacity: 1;
+  visibility: visible;
+  z-index: 2; }
+
+.print-pdf .reveal .slide-background {
+  opacity: 1 !important;
+  visibility: visible !important; }
+
+/* Video backgrounds */
+.reveal .slide-background video {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  max-width: none;
+  max-height: none;
+  top: 0;
+  left: 0;
+  -o-object-fit: cover;
+     object-fit: cover; }
+
+.reveal .slide-background[data-background-size="contain"] video {
+  -o-object-fit: contain;
+     object-fit: contain; }
+
+/* Immediate transition style */
+.reveal[data-background-transition=none] > .backgrounds .slide-background,
+.reveal > .backgrounds .slide-background[data-background-transition=none] {
+  transition: none; }
+
+/* Slide */
+.reveal[data-background-transition=slide] > .backgrounds .slide-background,
+.reveal > .backgrounds .slide-background[data-background-transition=slide] {
+  opacity: 1;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden; }
+
+.reveal[data-background-transition=slide] > .backgrounds .slide-background.past,
+.reveal > .backgrounds .slide-background.past[data-background-transition=slide] {
+  -webkit-transform: translate(-100%, 0);
+          transform: translate(-100%, 0); }
+
+.reveal[data-background-transition=slide] > .backgrounds .slide-background.future,
+.reveal > .backgrounds .slide-background.future[data-background-transition=slide] {
+  -webkit-transform: translate(100%, 0);
+          transform: translate(100%, 0); }
+
+.reveal[data-background-transition=slide] > .backgrounds .slide-background > .slide-background.past,
+.reveal > .backgrounds .slide-background > .slide-background.past[data-background-transition=slide] {
+  -webkit-transform: translate(0, -100%);
+          transform: translate(0, -100%); }
+
+.reveal[data-background-transition=slide] > .backgrounds .slide-background > .slide-background.future,
+.reveal > .backgrounds .slide-background > .slide-background.future[data-background-transition=slide] {
+  -webkit-transform: translate(0, 100%);
+          transform: translate(0, 100%); }
+
+/* Convex */
+.reveal[data-background-transition=convex] > .backgrounds .slide-background.past,
+.reveal > .backgrounds .slide-background.past[data-background-transition=convex] {
+  opacity: 0;
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0); }
+
+.reveal[data-background-transition=convex] > .backgrounds .slide-background.future,
+.reveal > .backgrounds .slide-background.future[data-background-transition=convex] {
+  opacity: 0;
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0); }
+
+.reveal[data-background-transition=convex] > .backgrounds .slide-background > .slide-background.past,
+.reveal > .backgrounds .slide-background > .slide-background.past[data-background-transition=convex] {
+  opacity: 0;
+  -webkit-transform: translate3d(0, -100%, 0) rotateX(90deg) translate3d(0, -100%, 0);
+          transform: translate3d(0, -100%, 0) rotateX(90deg) translate3d(0, -100%, 0); }
+
+.reveal[data-background-transition=convex] > .backgrounds .slide-background > .slide-background.future,
+.reveal > .backgrounds .slide-background > .slide-background.future[data-background-transition=convex] {
+  opacity: 0;
+  -webkit-transform: translate3d(0, 100%, 0) rotateX(-90deg) translate3d(0, 100%, 0);
+          transform: translate3d(0, 100%, 0) rotateX(-90deg) translate3d(0, 100%, 0); }
+
+/* Concave */
+.reveal[data-background-transition=concave] > .backgrounds .slide-background.past,
+.reveal > .backgrounds .slide-background.past[data-background-transition=concave] {
+  opacity: 0;
+  -webkit-transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0); }
+
+.reveal[data-background-transition=concave] > .backgrounds .slide-background.future,
+.reveal > .backgrounds .slide-background.future[data-background-transition=concave] {
+  opacity: 0;
+  -webkit-transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0); }
+
+.reveal[data-background-transition=concave] > .backgrounds .slide-background > .slide-background.past,
+.reveal > .backgrounds .slide-background > .slide-background.past[data-background-transition=concave] {
+  opacity: 0;
+  -webkit-transform: translate3d(0, -100%, 0) rotateX(-90deg) translate3d(0, -100%, 0);
+          transform: translate3d(0, -100%, 0) rotateX(-90deg) translate3d(0, -100%, 0); }
+
+.reveal[data-background-transition=concave] > .backgrounds .slide-background > .slide-background.future,
+.reveal > .backgrounds .slide-background > .slide-background.future[data-background-transition=concave] {
+  opacity: 0;
+  -webkit-transform: translate3d(0, 100%, 0) rotateX(90deg) translate3d(0, 100%, 0);
+          transform: translate3d(0, 100%, 0) rotateX(90deg) translate3d(0, 100%, 0); }
+
+/* Zoom */
+.reveal[data-background-transition=zoom] > .backgrounds .slide-background,
+.reveal > .backgrounds .slide-background[data-background-transition=zoom] {
+  transition-timing-function: ease; }
+
+.reveal[data-background-transition=zoom] > .backgrounds .slide-background.past,
+.reveal > .backgrounds .slide-background.past[data-background-transition=zoom] {
+  opacity: 0;
+  visibility: hidden;
+  -webkit-transform: scale(16);
+          transform: scale(16); }
+
+.reveal[data-background-transition=zoom] > .backgrounds .slide-background.future,
+.reveal > .backgrounds .slide-background.future[data-background-transition=zoom] {
+  opacity: 0;
+  visibility: hidden;
+  -webkit-transform: scale(0.2);
+          transform: scale(0.2); }
+
+.reveal[data-background-transition=zoom] > .backgrounds .slide-background > .slide-background.past,
+.reveal > .backgrounds .slide-background > .slide-background.past[data-background-transition=zoom] {
+  opacity: 0;
+  visibility: hidden;
+  -webkit-transform: scale(16);
+          transform: scale(16); }
+
+.reveal[data-background-transition=zoom] > .backgrounds .slide-background > .slide-background.future,
+.reveal > .backgrounds .slide-background > .slide-background.future[data-background-transition=zoom] {
+  opacity: 0;
+  visibility: hidden;
+  -webkit-transform: scale(0.2);
+          transform: scale(0.2); }
+
+/* Global transition speed settings */
+.reveal[data-transition-speed="fast"] > .backgrounds .slide-background {
+  transition-duration: 400ms; }
+
+.reveal[data-transition-speed="slow"] > .backgrounds .slide-background {
+  transition-duration: 1200ms; }
+
+/*********************************************
+ * OVERVIEW
+ *********************************************/
+.reveal.overview {
+  -webkit-perspective-origin: 50% 50%;
+          perspective-origin: 50% 50%;
+  -webkit-perspective: 700px;
+          perspective: 700px; }
+  .reveal.overview .slides {
+    -moz-transform-style: preserve-3d; }
+  .reveal.overview .slides section {
+    height: 100%;
+    top: 0 !important;
+    opacity: 1 !important;
+    overflow: hidden;
+    visibility: visible !important;
+    cursor: pointer;
+    box-sizing: border-box; }
+  .reveal.overview .slides section:hover,
+  .reveal.overview .slides section.present {
+    outline: 10px solid rgba(150, 150, 150, 0.4);
+    outline-offset: 10px; }
+  .reveal.overview .slides section .fragment {
+    opacity: 1;
+    transition: none; }
+  .reveal.overview .slides section:after,
+  .reveal.overview .slides section:before {
+    display: none !important; }
+  .reveal.overview .slides > section.stack {
+    padding: 0;
+    top: 0 !important;
+    background: none;
+    outline: none;
+    overflow: visible; }
+  .reveal.overview .backgrounds {
+    -webkit-perspective: inherit;
+            perspective: inherit;
+    -moz-transform-style: preserve-3d; }
+  .reveal.overview .backgrounds .slide-background {
+    opacity: 1;
+    visibility: visible;
+    outline: 10px solid rgba(150, 150, 150, 0.1);
+    outline-offset: 10px; }
+  .reveal.overview .backgrounds .slide-background.stack {
+    overflow: visible; }
+
+.reveal.overview .slides section,
+.reveal.overview-deactivating .slides section {
+  transition: none; }
+
+.reveal.overview .backgrounds .slide-background,
+.reveal.overview-deactivating .backgrounds .slide-background {
+  transition: none; }
+
+/*********************************************
+ * RTL SUPPORT
+ *********************************************/
+.reveal.rtl .slides,
+.reveal.rtl .slides h1,
+.reveal.rtl .slides h2,
+.reveal.rtl .slides h3,
+.reveal.rtl .slides h4,
+.reveal.rtl .slides h5,
+.reveal.rtl .slides h6 {
+  direction: rtl;
+  font-family: sans-serif; }
+
+.reveal.rtl pre,
+.reveal.rtl code {
+  direction: ltr; }
+
+.reveal.rtl ol,
+.reveal.rtl ul {
+  text-align: right; }
+
+.reveal.rtl .progress span {
+  float: right; }
+
+/*********************************************
+ * PARALLAX BACKGROUND
+ *********************************************/
+.reveal.has-parallax-background .backgrounds {
+  transition: all 0.8s ease; }
+
+/* Global transition speed settings */
+.reveal.has-parallax-background[data-transition-speed="fast"] .backgrounds {
+  transition-duration: 400ms; }
+
+.reveal.has-parallax-background[data-transition-speed="slow"] .backgrounds {
+  transition-duration: 1200ms; }
+
+/*********************************************
+ * OVERLAY FOR LINK PREVIEWS AND HELP
+ *********************************************/
+.reveal > .overlay {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  z-index: 1000;
+  background: rgba(0, 0, 0, 0.9);
+  opacity: 0;
+  visibility: hidden;
+  transition: all 0.3s ease; }
+
+.reveal > .overlay.visible {
+  opacity: 1;
+  visibility: visible; }
+
+.reveal > .overlay .spinner {
+  position: absolute;
+  display: block;
+  top: 50%;
+  left: 50%;
+  width: 32px;
+  height: 32px;
+  margin: -16px 0 0 -16px;
+  z-index: 10;
+  background-image: url(data:image/gif;base64,R0lGODlhIAAgAPMAAJmZmf%2F%2F%2F6%2Bvr8nJybW1tcDAwOjo6Nvb26ioqKOjo7Ozs%2FLy8vz8%2FAAAAAAAAAAAACH%2FC05FVFNDQVBFMi4wAwEAAAAh%2FhpDcmVhdGVkIHdpdGggYWpheGxvYWQuaW5mbwAh%2BQQJCgAAACwAAAAAIAAgAAAE5xDISWlhperN52JLhSSdRgwVo1ICQZRUsiwHpTJT4iowNS8vyW2icCF6k8HMMBkCEDskxTBDAZwuAkkqIfxIQyhBQBFvAQSDITM5VDW6XNE4KagNh6Bgwe60smQUB3d4Rz1ZBApnFASDd0hihh12BkE9kjAJVlycXIg7CQIFA6SlnJ87paqbSKiKoqusnbMdmDC2tXQlkUhziYtyWTxIfy6BE8WJt5YJvpJivxNaGmLHT0VnOgSYf0dZXS7APdpB309RnHOG5gDqXGLDaC457D1zZ%2FV%2FnmOM82XiHRLYKhKP1oZmADdEAAAh%2BQQJCgAAACwAAAAAIAAgAAAE6hDISWlZpOrNp1lGNRSdRpDUolIGw5RUYhhHukqFu8DsrEyqnWThGvAmhVlteBvojpTDDBUEIFwMFBRAmBkSgOrBFZogCASwBDEY%2FCZSg7GSE0gSCjQBMVG023xWBhklAnoEdhQEfyNqMIcKjhRsjEdnezB%2BA4k8gTwJhFuiW4dokXiloUepBAp5qaKpp6%2BHo7aWW54wl7obvEe0kRuoplCGepwSx2jJvqHEmGt6whJpGpfJCHmOoNHKaHx61WiSR92E4lbFoq%2BB6QDtuetcaBPnW6%2BO7wDHpIiK9SaVK5GgV543tzjgGcghAgAh%2BQQJCgAAACwAAAAAIAAgAAAE7hDISSkxpOrN5zFHNWRdhSiVoVLHspRUMoyUakyEe8PTPCATW9A14E0UvuAKMNAZKYUZCiBMuBakSQKG8G2FzUWox2AUtAQFcBKlVQoLgQReZhQlCIJesQXI5B0CBnUMOxMCenoCfTCEWBsJColTMANldx15BGs8B5wlCZ9Po6OJkwmRpnqkqnuSrayqfKmqpLajoiW5HJq7FL1Gr2mMMcKUMIiJgIemy7xZtJsTmsM4xHiKv5KMCXqfyUCJEonXPN2rAOIAmsfB3uPoAK%2B%2BG%2Bw48edZPK%2BM6hLJpQg484enXIdQFSS1u6UhksENEQAAIfkECQoAAAAsAAAAACAAIAAABOcQyEmpGKLqzWcZRVUQnZYg1aBSh2GUVEIQ2aQOE%2BG%2BcD4ntpWkZQj1JIiZIogDFFyHI0UxQwFugMSOFIPJftfVAEoZLBbcLEFhlQiqGp1Vd140AUklUN3eCA51C1EWMzMCezCBBmkxVIVHBWd3HHl9JQOIJSdSnJ0TDKChCwUJjoWMPaGqDKannasMo6WnM562R5YluZRwur0wpgqZE7NKUm%2BFNRPIhjBJxKZteWuIBMN4zRMIVIhffcgojwCF117i4nlLnY5ztRLsnOk%2BaV%2BoJY7V7m76PdkS4trKcdg0Zc0tTcKkRAAAIfkECQoAAAAsAAAAACAAIAAABO4QyEkpKqjqzScpRaVkXZWQEximw1BSCUEIlDohrft6cpKCk5xid5MNJTaAIkekKGQkWyKHkvhKsR7ARmitkAYDYRIbUQRQjWBwJRzChi9CRlBcY1UN4g0%2FVNB0AlcvcAYHRyZPdEQFYV8ccwR5HWxEJ02YmRMLnJ1xCYp0Y5idpQuhopmmC2KgojKasUQDk5BNAwwMOh2RtRq5uQuPZKGIJQIGwAwGf6I0JXMpC8C7kXWDBINFMxS4DKMAWVWAGYsAdNqW5uaRxkSKJOZKaU3tPOBZ4DuK2LATgJhkPJMgTwKCdFjyPHEnKxFCDhEAACH5BAkKAAAALAAAAAAgACAAAATzEMhJaVKp6s2nIkolIJ2WkBShpkVRWqqQrhLSEu9MZJKK9y1ZrqYK9WiClmvoUaF8gIQSNeF1Er4MNFn4SRSDARWroAIETg1iVwuHjYB1kYc1mwruwXKC9gmsJXliGxc%2BXiUCby9ydh1sOSdMkpMTBpaXBzsfhoc5l58Gm5yToAaZhaOUqjkDgCWNHAULCwOLaTmzswadEqggQwgHuQsHIoZCHQMMQgQGubVEcxOPFAcMDAYUA85eWARmfSRQCdcMe0zeP1AAygwLlJtPNAAL19DARdPzBOWSm1brJBi45soRAWQAAkrQIykShQ9wVhHCwCQCACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiRMDjI0Fd30%2FiI2UA5GSS5UDj2l6NoqgOgN4gksEBgYFf0FDqKgHnyZ9OX8HrgYHdHpcHQULXAS2qKpENRg7eAMLC7kTBaixUYFkKAzWAAnLC7FLVxLWDBLKCwaKTULgEwbLA4hJtOkSBNqITT3xEgfLpBtzE%2FjiuL04RGEBgwWhShRgQExHBAAh%2BQQJCgAAACwAAAAAIAAgAAAE7xDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfZiCqGk5dTESJeaOAlClzsJsqwiJwiqnFrb2nS9kmIcgEsjQydLiIlHehhpejaIjzh9eomSjZR%2BipslWIRLAgMDOR2DOqKogTB9pCUJBagDBXR6XB0EBkIIsaRsGGMMAxoDBgYHTKJiUYEGDAzHC9EACcUGkIgFzgwZ0QsSBcXHiQvOwgDdEwfFs0sDzt4S6BK4xYjkDOzn0unFeBzOBijIm1Dgmg5YFQwsCMjp1oJ8LyIAACH5BAkKAAAALAAAAAAgACAAAATwEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GGl6NoiPOH16iZKNlH6KmyWFOggHhEEvAwwMA0N9GBsEC6amhnVcEwavDAazGwIDaH1ipaYLBUTCGgQDA8NdHz0FpqgTBwsLqAbWAAnIA4FWKdMLGdYGEgraigbT0OITBcg5QwPT4xLrROZL6AuQAPUS7bxLpoWidY0JtxLHKhwwMJBTHgPKdEQAACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GAULDJCRiXo1CpGXDJOUjY%2BYip9DhToJA4RBLwMLCwVDfRgbBAaqqoZ1XBMHswsHtxtFaH1iqaoGNgAIxRpbFAgfPQSqpbgGBqUD1wBXeCYp1AYZ19JJOYgH1KwA4UBvQwXUBxPqVD9L3sbp2BNk2xvvFPJd%2BMFCN6HAAIKgNggY0KtEBAAh%2BQQJCgAAACwAAAAAIAAgAAAE6BDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfYIDMaAFdTESJeaEDAIMxYFqrOUaNW4E4ObYcCXaiBVEgULe0NJaxxtYksjh2NLkZISgDgJhHthkpU4mW6blRiYmZOlh4JWkDqILwUGBnE6TYEbCgevr0N1gH4At7gHiRpFaLNrrq8HNgAJA70AWxQIH1%2BvsYMDAzZQPC9VCNkDWUhGkuE5PxJNwiUK4UfLzOlD4WvzAHaoG9nxPi5d%2BjYUqfAhhykOFwJWiAAAIfkECQoAAAAsAAAAACAAIAAABPAQyElpUqnqzaciSoVkXVUMFaFSwlpOCcMYlErAavhOMnNLNo8KsZsMZItJEIDIFSkLGQoQTNhIsFehRww2CQLKF0tYGKYSg%2BygsZIuNqJksKgbfgIGepNo2cIUB3V1B3IvNiBYNQaDSTtfhhx0CwVPI0UJe0%2Bbm4g5VgcGoqOcnjmjqDSdnhgEoamcsZuXO1aWQy8KAwOAuTYYGwi7w5h%2BKr0SJ8MFihpNbx%2B4Erq7BYBuzsdiH1jCAzoSfl0rVirNbRXlBBlLX%2BBP0XJLAPGzTkAuAOqb0WT5AH7OcdCm5B8TgRwSRKIHQtaLCwg1RAAAOwAAAAAAAAAAAA%3D%3D);
+  visibility: visible;
+  opacity: 0.6;
+  transition: all 0.3s ease; }
+
+.reveal > .overlay header {
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 100%;
+  height: 40px;
+  z-index: 2;
+  border-bottom: 1px solid #222; }
+
+.reveal > .overlay header a {
+  display: inline-block;
+  width: 40px;
+  height: 40px;
+  line-height: 36px;
+  padding: 0 10px;
+  float: right;
+  opacity: 0.6;
+  box-sizing: border-box; }
+
+.reveal > .overlay header a:hover {
+  opacity: 1; }
+
+.reveal > .overlay header a .icon {
+  display: inline-block;
+  width: 20px;
+  height: 20px;
+  background-position: 50% 50%;
+  background-size: 100%;
+  background-repeat: no-repeat; }
+
+.reveal > .overlay header a.close .icon {
+  background-image: url(data:image/png;base64,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); }
+
+.reveal > .overlay header a.external .icon {
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAcElEQVRYR+2WSQoAIQwEzf8f7XiOMkUQxUPlGkM3hVmiQfQR9GYnH1SsAQlI4DiBqkCMoNb9y2e90IAEJPAcgdznU9+engMaeJ7Azh5Y1U67gAho4DqBqmB1buAf0MB1AlVBek83ZPkmJMGc1wAR+AAqod/B97TRpQAAAABJRU5ErkJggg==); }
+
+.reveal > .overlay .viewport {
+  position: absolute;
+  display: -webkit-box;
+  display: -ms-flexbox;
+  display: flex;
+  top: 40px;
+  right: 0;
+  bottom: 0;
+  left: 0; }
+
+.reveal > .overlay.overlay-preview .viewport iframe {
+  width: 100%;
+  height: 100%;
+  max-width: 100%;
+  max-height: 100%;
+  border: 0;
+  opacity: 0;
+  visibility: hidden;
+  transition: all 0.3s ease; }
+
+.reveal > .overlay.overlay-preview.loaded .viewport iframe {
+  opacity: 1;
+  visibility: visible; }
+
+.reveal > .overlay.overlay-preview.loaded .viewport-inner {
+  position: absolute;
+  z-index: -1;
+  left: 0;
+  top: 45%;
+  width: 100%;
+  text-align: center;
+  letter-spacing: normal; }
+
+.reveal > .overlay.overlay-preview .x-frame-error {
+  opacity: 0;
+  transition: opacity 0.3s ease 0.3s; }
+
+.reveal > .overlay.overlay-preview.loaded .x-frame-error {
+  opacity: 1; }
+
+.reveal > .overlay.overlay-preview.loaded .spinner {
+  opacity: 0;
+  visibility: hidden;
+  -webkit-transform: scale(0.2);
+          transform: scale(0.2); }
+
+.reveal > .overlay.overlay-help .viewport {
+  overflow: auto;
+  color: #fff; }
+
+.reveal > .overlay.overlay-help .viewport .viewport-inner {
+  width: 600px;
+  margin: auto;
+  padding: 20px 20px 80px 20px;
+  text-align: center;
+  letter-spacing: normal; }
+
+.reveal > .overlay.overlay-help .viewport .viewport-inner .title {
+  font-size: 20px; }
+
+.reveal > .overlay.overlay-help .viewport .viewport-inner table {
+  border: 1px solid #fff;
+  border-collapse: collapse;
+  font-size: 16px; }
+
+.reveal > .overlay.overlay-help .viewport .viewport-inner table th,
+.reveal > .overlay.overlay-help .viewport .viewport-inner table td {
+  width: 200px;
+  padding: 14px;
+  border: 1px solid #fff;
+  vertical-align: middle; }
+
+.reveal > .overlay.overlay-help .viewport .viewport-inner table th {
+  padding-top: 20px;
+  padding-bottom: 20px; }
+
+/*********************************************
+ * PLAYBACK COMPONENT
+ *********************************************/
+.reveal .playback {
+  position: absolute;
+  left: 15px;
+  bottom: 20px;
+  z-index: 30;
+  cursor: pointer;
+  transition: all 400ms ease;
+  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }
+
+.reveal.overview .playback {
+  opacity: 0;
+  visibility: hidden; }
+
+/*********************************************
+ * CODE HIGHLGIHTING
+ *********************************************/
+.reveal .hljs table {
+  margin: initial; }
+
+.reveal .hljs-ln-code,
+.reveal .hljs-ln-numbers {
+  padding: 0;
+  border: 0; }
+
+.reveal .hljs-ln-numbers {
+  opacity: 0.6;
+  padding-right: 0.75em;
+  text-align: right;
+  vertical-align: top; }
+
+.reveal .hljs.has-highlights tr:not(.highlight-line) {
+  opacity: 0.4; }
+
+.reveal .hljs:not(:first-child).fragment {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  box-sizing: border-box; }
+
+/*********************************************
+ * ROLLING LINKS
+ *********************************************/
+.reveal .roll {
+  display: inline-block;
+  line-height: 1.2;
+  overflow: hidden;
+  vertical-align: top;
+  -webkit-perspective: 400px;
+          perspective: 400px;
+  -webkit-perspective-origin: 50% 50%;
+          perspective-origin: 50% 50%; }
+
+.reveal .roll:hover {
+  background: none;
+  text-shadow: none; }
+
+.reveal .roll span {
+  display: block;
+  position: relative;
+  padding: 0 2px;
+  pointer-events: none;
+  transition: all 400ms ease;
+  -webkit-transform-origin: 50% 0%;
+          transform-origin: 50% 0%;
+  -webkit-transform-style: preserve-3d;
+          transform-style: preserve-3d;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden; }
+
+.reveal .roll:hover span {
+  background: rgba(0, 0, 0, 0.5);
+  -webkit-transform: translate3d(0px, 0px, -45px) rotateX(90deg);
+          transform: translate3d(0px, 0px, -45px) rotateX(90deg); }
+
+.reveal .roll span:after {
+  content: attr(data-title);
+  display: block;
+  position: absolute;
+  left: 0;
+  top: 0;
+  padding: 0 2px;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden;
+  -webkit-transform-origin: 50% 0%;
+          transform-origin: 50% 0%;
+  -webkit-transform: translate3d(0px, 110%, 0px) rotateX(-90deg);
+          transform: translate3d(0px, 110%, 0px) rotateX(-90deg); }
+
+/*********************************************
+ * SPEAKER NOTES
+ *********************************************/
+.reveal aside.notes {
+  display: none; }
+
+.reveal .speaker-notes {
+  display: none;
+  position: absolute;
+  width: 33.3333333333%;
+  height: 100%;
+  top: 0;
+  left: 100%;
+  padding: 14px 18px 14px 18px;
+  z-index: 1;
+  font-size: 18px;
+  line-height: 1.4;
+  border: 1px solid rgba(0, 0, 0, 0.05);
+  color: #222;
+  background-color: #f5f5f5;
+  overflow: auto;
+  box-sizing: border-box;
+  text-align: left;
+  font-family: Helvetica, sans-serif;
+  -webkit-overflow-scrolling: touch; }
+  .reveal .speaker-notes .notes-placeholder {
+    color: #ccc;
+    font-style: italic; }
+  .reveal .speaker-notes:focus {
+    outline: none; }
+  .reveal .speaker-notes:before {
+    content: 'Speaker notes';
+    display: block;
+    margin-bottom: 10px;
+    opacity: 0.5; }
+
+.reveal.show-notes {
+  max-width: 75%;
+  overflow: visible; }
+
+.reveal.show-notes .speaker-notes {
+  display: block; }
+
+@media screen and (min-width: 1600px) {
+  .reveal .speaker-notes {
+    font-size: 20px; } }
+
+@media screen and (max-width: 1024px) {
+  .reveal.show-notes {
+    border-left: 0;
+    max-width: none;
+    max-height: 70%;
+    max-height: 70vh;
+    overflow: visible; }
+  .reveal.show-notes .speaker-notes {
+    top: 100%;
+    left: 0;
+    width: 100%;
+    height: 42.8571428571%;
+    height: 30vh;
+    border: 0; } }
+
+@media screen and (max-width: 600px) {
+  .reveal.show-notes {
+    max-height: 60%;
+    max-height: 60vh; }
+  .reveal.show-notes .speaker-notes {
+    top: 100%;
+    height: 66.6666666667%;
+    height: 40vh; }
+  .reveal .speaker-notes {
+    font-size: 14px; } }
+
+/*********************************************
+ * ZOOM PLUGIN
+ *********************************************/
+.zoomed .reveal *,
+.zoomed .reveal *:before,
+.zoomed .reveal *:after {
+  -webkit-backface-visibility: visible !important;
+          backface-visibility: visible !important; }
+
+.zoomed .reveal .progress,
+.zoomed .reveal .controls {
+  opacity: 0; }
+
+.zoomed .reveal .roll span {
+  background: none; }
+
+.zoomed .reveal .roll span:after {
+  visibility: hidden; }
diff --git a/static/reveal.js/css/reveal.scss b/static/reveal.js/css/reveal.scss
new file mode 100644
index 0000000..ab11f32
--- /dev/null
+++ b/static/reveal.js/css/reveal.scss
@@ -0,0 +1,1777 @@
+/*!
+ * reveal.js
+ * http://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+ */
+
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+
+html {
+	width: 100%;
+	height: 100%;
+	height: 100vh;
+	height: calc( var(--vh, 1vh) * 100 );
+	overflow: hidden;
+}
+
+body {
+	height: 100%;
+	overflow: hidden;
+	position: relative;
+	line-height: 1;
+	margin: 0;
+
+	background-color: #fff;
+	color: #000;
+}
+
+
+/*********************************************
+ * VIEW FRAGMENTS
+ *********************************************/
+
+.reveal .slides section .fragment {
+	opacity: 0;
+	visibility: hidden;
+	transition: all .2s ease;
+
+	&.visible {
+		opacity: 1;
+		visibility: inherit;
+	}
+}
+
+.reveal .slides section .fragment.grow {
+	opacity: 1;
+	visibility: inherit;
+
+	&.visible {
+		transform: scale( 1.3 );
+	}
+}
+
+.reveal .slides section .fragment.shrink {
+	opacity: 1;
+	visibility: inherit;
+
+	&.visible {
+		transform: scale( 0.7 );
+	}
+}
+
+.reveal .slides section .fragment.zoom-in {
+	transform: scale( 0.1 );
+
+	&.visible {
+		transform: none;
+	}
+}
+
+.reveal .slides section .fragment.fade-out {
+	opacity: 1;
+	visibility: inherit;
+
+	&.visible {
+		opacity: 0;
+		visibility: hidden;
+	}
+}
+
+.reveal .slides section .fragment.semi-fade-out {
+	opacity: 1;
+	visibility: inherit;
+
+	&.visible {
+		opacity: 0.5;
+		visibility: inherit;
+	}
+}
+
+.reveal .slides section .fragment.strike {
+	opacity: 1;
+	visibility: inherit;
+
+	&.visible {
+		text-decoration: line-through;
+	}
+}
+
+.reveal .slides section .fragment.fade-up {
+	transform: translate(0, 40px);
+
+	&.visible {
+		transform: translate(0, 0);
+	}
+}
+
+.reveal .slides section .fragment.fade-down {
+	transform: translate(0, -40px);
+
+	&.visible {
+		transform: translate(0, 0);
+	}
+}
+
+.reveal .slides section .fragment.fade-right {
+	transform: translate(-40px, 0);
+
+	&.visible {
+		transform: translate(0, 0);
+	}
+}
+
+.reveal .slides section .fragment.fade-left {
+	transform: translate(40px, 0);
+
+	&.visible {
+		transform: translate(0, 0);
+	}
+}
+
+.reveal .slides section .fragment.fade-in-then-out,
+.reveal .slides section .fragment.current-visible {
+	opacity: 0;
+	visibility: hidden;
+
+	&.current-fragment {
+		opacity: 1;
+		visibility: inherit;
+	}
+}
+
+.reveal .slides section .fragment.fade-in-then-semi-out {
+	opacity: 0;
+	visibility: hidden;
+
+	&.visible {
+		opacity: 0.5;
+		visibility: inherit;
+	}
+
+	&.current-fragment {
+		opacity: 1;
+		visibility: inherit;
+	}
+}
+
+.reveal .slides section .fragment.highlight-red,
+.reveal .slides section .fragment.highlight-current-red,
+.reveal .slides section .fragment.highlight-green,
+.reveal .slides section .fragment.highlight-current-green,
+.reveal .slides section .fragment.highlight-blue,
+.reveal .slides section .fragment.highlight-current-blue {
+	opacity: 1;
+	visibility: inherit;
+}
+	.reveal .slides section .fragment.highlight-red.visible {
+		color: #ff2c2d
+	}
+	.reveal .slides section .fragment.highlight-green.visible {
+		color: #17ff2e;
+	}
+	.reveal .slides section .fragment.highlight-blue.visible {
+		color: #1b91ff;
+	}
+
+.reveal .slides section .fragment.highlight-current-red.current-fragment {
+	color: #ff2c2d
+}
+.reveal .slides section .fragment.highlight-current-green.current-fragment {
+	color: #17ff2e;
+}
+.reveal .slides section .fragment.highlight-current-blue.current-fragment {
+	color: #1b91ff;
+}
+
+
+/*********************************************
+ * DEFAULT ELEMENT STYLES
+ *********************************************/
+
+/* Fixes issue in Chrome where italic fonts did not appear when printing to PDF */
+.reveal:after {
+  content: '';
+  font-style: italic;
+}
+
+.reveal iframe {
+	z-index: 1;
+}
+
+/** Prevents layering issues in certain browser/transition combinations */
+.reveal a {
+	position: relative;
+}
+
+.reveal .stretch {
+	max-width: none;
+	max-height: none;
+}
+
+.reveal pre.stretch code {
+	height: 100%;
+	max-height: 100%;
+	box-sizing: border-box;
+}
+
+
+/*********************************************
+ * CONTROLS
+ *********************************************/
+
+@keyframes bounce-right {
+	0%, 10%, 25%, 40%, 50% {transform: translateX(0);}
+	20% {transform: translateX(10px);}
+	30% {transform: translateX(-5px);}
+}
+
+@keyframes bounce-down {
+	0%, 10%, 25%, 40%, 50% {transform: translateY(0);}
+	20% {transform: translateY(10px);}
+	30% {transform: translateY(-5px);}
+}
+
+$controlArrowSize: 3.6em;
+$controlArrowSpacing: 1.4em;
+$controlArrowLength: 2.6em;
+$controlArrowThickness: 0.5em;
+$controlsArrowAngle: 45deg;
+$controlsArrowAngleHover: 40deg;
+$controlsArrowAngleActive: 36deg;
+
+@mixin controlsArrowTransform( $angle ) {
+	&:before {
+		transform: translateX(($controlArrowSize - $controlArrowLength)/2) translateY(($controlArrowSize - $controlArrowThickness)/2) rotate( $angle );
+	}
+
+	&:after {
+		transform: translateX(($controlArrowSize - $controlArrowLength)/2) translateY(($controlArrowSize - $controlArrowThickness)/2) rotate( -$angle );
+	}
+}
+
+.reveal .controls {
+	$spacing: 12px;
+
+	display: none;
+	position: absolute;
+	top: auto;
+	bottom: $spacing;
+	right: $spacing;
+	left: auto;
+	z-index: 11;
+	color: #000;
+	pointer-events: none;
+	font-size: 10px;
+
+	button {
+		position: absolute;
+		padding: 0;
+		background-color: transparent;
+		border: 0;
+		outline: 0;
+		cursor: pointer;
+		color: currentColor;
+		transform: scale(.9999);
+		transition: color 0.2s ease,
+					opacity 0.2s ease,
+					transform 0.2s ease;
+		z-index: 2; // above slides
+		pointer-events: auto;
+		font-size: inherit;
+
+		visibility: hidden;
+		opacity: 0;
+
+		-webkit-appearance: none;
+		-webkit-tap-highlight-color: rgba( 0, 0, 0, 0 );
+	}
+
+	.controls-arrow:before,
+	.controls-arrow:after {
+		content: '';
+		position: absolute;
+		top: 0;
+		left: 0;
+		width: $controlArrowLength;
+		height: $controlArrowThickness;
+		border-radius: $controlArrowThickness/2;
+		background-color: currentColor;
+
+		transition: all 0.15s ease, background-color 0.8s ease;
+		transform-origin: floor(($controlArrowThickness/2)*10)/10 50%;
+		will-change: transform;
+	}
+
+	.controls-arrow {
+		position: relative;
+		width: $controlArrowSize;
+		height: $controlArrowSize;
+
+		@include controlsArrowTransform( $controlsArrowAngle );
+
+		&:hover {
+			@include controlsArrowTransform( $controlsArrowAngleHover );
+		}
+
+		&:active {
+			@include controlsArrowTransform( $controlsArrowAngleActive );
+		}
+	}
+
+	.navigate-left {
+		right: $controlArrowSize + $controlArrowSpacing*2;
+		bottom: $controlArrowSpacing + $controlArrowSize/2;
+		transform: translateX( -10px );
+	}
+
+	.navigate-right {
+		right: 0;
+		bottom: $controlArrowSpacing + $controlArrowSize/2;
+		transform: translateX( 10px );
+
+		.controls-arrow {
+			transform: rotate( 180deg );
+		}
+
+		&.highlight {
+			animation: bounce-right 2s 50 both ease-out;
+		}
+	}
+
+	.navigate-up {
+		right: $controlArrowSpacing + $controlArrowSize/2;
+		bottom: $controlArrowSpacing*2 + $controlArrowSize;
+		transform: translateY( -10px );
+
+		.controls-arrow {
+			transform: rotate( 90deg );
+		}
+	}
+
+	.navigate-down {
+		right: $controlArrowSpacing + $controlArrowSize/2;
+		bottom: -$controlArrowSpacing;
+		padding-bottom: $controlArrowSpacing;
+		transform: translateY( 10px );
+
+		.controls-arrow {
+			transform: rotate( -90deg );
+		}
+
+		&.highlight {
+			animation: bounce-down 2s 50 both ease-out;
+		}
+	}
+
+	// Back arrow style: "faded":
+	// Deemphasize backwards navigation arrows in favor of drawing
+	// attention to forwards navigation
+	&[data-controls-back-arrows="faded"] .navigate-left.enabled,
+	&[data-controls-back-arrows="faded"] .navigate-up.enabled {
+		opacity: 0.3;
+
+		&:hover {
+			opacity: 1;
+		}
+	}
+
+	// Back arrow style: "hidden":
+	// Never show arrows for backwards navigation
+	&[data-controls-back-arrows="hidden"] .navigate-left.enabled,
+	&[data-controls-back-arrows="hidden"] .navigate-up.enabled {
+		opacity: 0;
+		visibility: hidden;
+	}
+
+	// Any control button that can be clicked is "enabled"
+	.enabled {
+		visibility: visible;
+		opacity: 0.9;
+		cursor: pointer;
+		transform: none;
+	}
+
+	// Any control button that leads to showing or hiding
+	// a fragment
+	.enabled.fragmented {
+		opacity: 0.5;
+	}
+
+	.enabled:hover,
+	.enabled.fragmented:hover {
+		opacity: 1;
+	}
+}
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
+	display: none;
+}
+
+// Adjust the layout when there are no vertical slides
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-left,
+.reveal:not(.has-vertical-slides) .controls .navigate-left {
+	bottom: $controlArrowSpacing;
+	right: 0.5em + $controlArrowSpacing + $controlArrowSize;
+}
+
+.reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-right,
+.reveal:not(.has-vertical-slides) .controls .navigate-right {
+	bottom: $controlArrowSpacing;
+	right: 0.5em;
+}
+
+// Adjust the layout when there are no horizontal slides
+.reveal:not(.has-horizontal-slides) .controls .navigate-up {
+	right: $controlArrowSpacing;
+	bottom: $controlArrowSpacing + $controlArrowSize;
+}
+.reveal:not(.has-horizontal-slides) .controls .navigate-down {
+	right: $controlArrowSpacing;
+	bottom: 0.5em;
+}
+
+// Invert arrows based on background color
+.reveal.has-dark-background .controls {
+	color: #fff;
+}
+.reveal.has-light-background .controls {
+	color: #000;
+}
+
+// Disable active states on touch devices
+.reveal.no-hover .controls .controls-arrow:hover,
+.reveal.no-hover .controls .controls-arrow:active {
+	@include controlsArrowTransform( $controlsArrowAngle );
+}
+
+// Edge aligned controls layout
+@media screen and (min-width: 500px) {
+
+	$spacing: 0.8em;
+
+	.reveal .controls[data-controls-layout="edges"] {
+		& {
+			top: 0;
+			right: 0;
+			bottom: 0;
+			left: 0;
+		}
+
+		.navigate-left,
+		.navigate-right,
+		.navigate-up,
+		.navigate-down {
+			bottom: auto;
+			right: auto;
+		}
+
+		.navigate-left {
+			top: 50%;
+			left: $spacing;
+			margin-top: -$controlArrowSize/2;
+		}
+
+		.navigate-right {
+			top: 50%;
+			right: $spacing;
+			margin-top: -$controlArrowSize/2;
+		}
+
+		.navigate-up {
+			top: $spacing;
+			left: 50%;
+			margin-left: -$controlArrowSize/2;
+		}
+
+		.navigate-down {
+			bottom: $spacing - $controlArrowSpacing + 0.3em;
+			left: 50%;
+			margin-left: -$controlArrowSize/2;
+		}
+	}
+
+}
+
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+
+.reveal .progress {
+	position: absolute;
+	display: none;
+	height: 3px;
+	width: 100%;
+	bottom: 0;
+	left: 0;
+	z-index: 10;
+
+	background-color: rgba( 0, 0, 0, 0.2 );
+	color: #fff;
+}
+	.reveal .progress:after {
+		content: '';
+		display: block;
+		position: absolute;
+		height: 10px;
+		width: 100%;
+		top: -10px;
+	}
+	.reveal .progress span {
+		display: block;
+		height: 100%;
+		width: 0px;
+
+		background-color: currentColor;
+		transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+	}
+
+/*********************************************
+ * SLIDE NUMBER
+ *********************************************/
+
+.reveal .slide-number {
+	position: absolute;
+	display: block;
+	right: 8px;
+	bottom: 8px;
+	z-index: 31;
+	font-family: Helvetica, sans-serif;
+	font-size: 12px;
+	line-height: 1;
+	color: #fff;
+	background-color: rgba( 0, 0, 0, 0.4 );
+	padding: 5px;
+}
+
+.reveal .slide-number a {
+	color: currentColor;
+}
+
+.reveal .slide-number-delimiter {
+	margin: 0 3px;
+}
+
+/*********************************************
+ * SLIDES
+ *********************************************/
+
+.reveal {
+	position: relative;
+	width: 100%;
+	height: 100%;
+	overflow: hidden;
+	touch-action: pinch-zoom;
+}
+
+.reveal .slides {
+	position: absolute;
+	width: 100%;
+	height: 100%;
+	top: 0;
+	right: 0;
+	bottom: 0;
+	left: 0;
+	margin: auto;
+	pointer-events: none;
+
+	overflow: visible;
+	z-index: 1;
+	text-align: center;
+	perspective: 600px;
+	perspective-origin: 50% 40%;
+}
+
+.reveal .slides>section {
+	perspective: 600px;
+}
+
+.reveal .slides>section,
+.reveal .slides>section>section {
+	display: none;
+	position: absolute;
+	width: 100%;
+	padding: 20px 0px;
+	pointer-events: auto;
+
+	z-index: 10;
+	transform-style: flat;
+	transition: transform-origin 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985),
+				transform 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985),
+				visibility 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985),
+				opacity 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+}
+
+/* Global transition speed settings */
+.reveal[data-transition-speed="fast"] .slides section {
+	transition-duration: 400ms;
+}
+.reveal[data-transition-speed="slow"] .slides section {
+	transition-duration: 1200ms;
+}
+
+/* Slide-specific transition speed overrides */
+.reveal .slides section[data-transition-speed="fast"] {
+	transition-duration: 400ms;
+}
+.reveal .slides section[data-transition-speed="slow"] {
+	transition-duration: 1200ms;
+}
+
+.reveal .slides>section.stack {
+	padding-top: 0;
+	padding-bottom: 0;
+	pointer-events: none;
+	height: 100%;
+}
+
+.reveal .slides>section.present,
+.reveal .slides>section>section.present {
+	display: block;
+	z-index: 11;
+	opacity: 1;
+}
+
+.reveal .slides>section:empty,
+.reveal .slides>section>section:empty,
+.reveal .slides>section[data-background-interactive],
+.reveal .slides>section>section[data-background-interactive] {
+	pointer-events: none;
+}
+
+.reveal.center,
+.reveal.center .slides,
+.reveal.center .slides section {
+	min-height: 0 !important;
+}
+
+/* Don't allow interaction with invisible slides */
+.reveal .slides>section.future,
+.reveal .slides>section>section.future,
+.reveal .slides>section.past,
+.reveal .slides>section>section.past {
+	pointer-events: none;
+}
+
+.reveal.overview .slides>section,
+.reveal.overview .slides>section>section {
+	pointer-events: auto;
+}
+
+.reveal .slides>section.past,
+.reveal .slides>section.future,
+.reveal .slides>section>section.past,
+.reveal .slides>section>section.future {
+	opacity: 0;
+}
+
+
+/*********************************************
+ * Mixins for readability of transitions
+ *********************************************/
+
+@mixin transition-global($style) {
+	.reveal .slides section[data-transition=#{$style}],
+	.reveal.#{$style} .slides section:not([data-transition]) {
+		@content;
+	}
+}
+@mixin transition-stack($style) {
+	.reveal .slides section[data-transition=#{$style}].stack,
+	.reveal.#{$style} .slides section.stack {
+		@content;
+	}
+}
+@mixin transition-horizontal-past($style) {
+	.reveal .slides>section[data-transition=#{$style}].past,
+	.reveal .slides>section[data-transition~=#{$style}-out].past,
+	.reveal.#{$style} .slides>section:not([data-transition]).past {
+		@content;
+	}
+}
+@mixin transition-horizontal-future($style) {
+	.reveal .slides>section[data-transition=#{$style}].future,
+	.reveal .slides>section[data-transition~=#{$style}-in].future,
+	.reveal.#{$style} .slides>section:not([data-transition]).future {
+		@content;
+	}
+}
+
+@mixin transition-vertical-past($style) {
+	.reveal .slides>section>section[data-transition=#{$style}].past,
+	.reveal .slides>section>section[data-transition~=#{$style}-out].past,
+	.reveal.#{$style} .slides>section>section:not([data-transition]).past {
+		@content;
+	}
+}
+@mixin transition-vertical-future($style) {
+	.reveal .slides>section>section[data-transition=#{$style}].future,
+	.reveal .slides>section>section[data-transition~=#{$style}-in].future,
+	.reveal.#{$style} .slides>section>section:not([data-transition]).future {
+		@content;
+	}
+}
+
+/*********************************************
+ * SLIDE TRANSITION
+ * Aliased 'linear' for backwards compatibility
+ *********************************************/
+
+@each $stylename in slide, linear {
+	.reveal.#{$stylename} section {
+		backface-visibility: hidden;
+	}
+	@include transition-horizontal-past(#{$stylename}) {
+		transform: translate(-150%, 0);
+	}
+	@include transition-horizontal-future(#{$stylename}) {
+		transform: translate(150%, 0);
+	}
+	@include transition-vertical-past(#{$stylename}) {
+		transform: translate(0, -150%);
+	}
+	@include transition-vertical-future(#{$stylename}) {
+		transform: translate(0, 150%);
+	}
+}
+
+/*********************************************
+ * CONVEX TRANSITION
+ * Aliased 'default' for backwards compatibility
+ *********************************************/
+
+@each $stylename in default, convex {
+	@include transition-stack(#{$stylename}) {
+		transform-style: preserve-3d;
+	}
+
+	@include transition-horizontal-past(#{$stylename}) {
+		transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0);
+	}
+	@include transition-horizontal-future(#{$stylename}) {
+		transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0);
+	}
+	@include transition-vertical-past(#{$stylename}) {
+		transform: translate3d(0, -300px, 0) rotateX(70deg) translate3d(0, -300px, 0);
+	}
+	@include transition-vertical-future(#{$stylename}) {
+		transform: translate3d(0, 300px, 0) rotateX(-70deg) translate3d(0, 300px, 0);
+	}
+}
+
+/*********************************************
+ * CONCAVE TRANSITION
+ *********************************************/
+
+@include transition-stack(concave) {
+	transform-style: preserve-3d;
+}
+
+@include transition-horizontal-past(concave) {
+	transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0);
+}
+@include transition-horizontal-future(concave) {
+	transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0);
+}
+@include transition-vertical-past(concave) {
+	transform: translate3d(0, -80%, 0) rotateX(-70deg) translate3d(0, -80%, 0);
+}
+@include transition-vertical-future(concave) {
+	transform: translate3d(0, 80%, 0) rotateX(70deg) translate3d(0, 80%, 0);
+}
+
+
+/*********************************************
+ * ZOOM TRANSITION
+ *********************************************/
+
+@include transition-global(zoom) {
+	transition-timing-function: ease;
+}
+@include transition-horizontal-past(zoom) {
+	visibility: hidden;
+	transform: scale(16);
+}
+@include transition-horizontal-future(zoom) {
+	visibility: hidden;
+	transform: scale(0.2);
+}
+@include transition-vertical-past(zoom) {
+	transform: scale(16);
+}
+@include transition-vertical-future(zoom) {
+	transform: scale(0.2);
+}
+
+
+/*********************************************
+ * CUBE TRANSITION
+ *
+ * WARNING:
+ * this is deprecated and will be removed in a
+ * future version.
+ *********************************************/
+
+.reveal.cube .slides {
+	perspective: 1300px;
+}
+
+.reveal.cube .slides section {
+	padding: 30px;
+	min-height: 700px;
+	backface-visibility: hidden;
+	box-sizing: border-box;
+	transform-style: preserve-3d;
+}
+	.reveal.center.cube .slides section {
+		min-height: 0;
+	}
+	.reveal.cube .slides section:not(.stack):before {
+		content: '';
+		position: absolute;
+		display: block;
+		width: 100%;
+		height: 100%;
+		left: 0;
+		top: 0;
+		background: rgba(0,0,0,0.1);
+		border-radius: 4px;
+		transform: translateZ( -20px );
+	}
+	.reveal.cube .slides section:not(.stack):after {
+		content: '';
+		position: absolute;
+		display: block;
+		width: 90%;
+		height: 30px;
+		left: 5%;
+		bottom: 0;
+		background: none;
+		z-index: 1;
+
+		border-radius: 4px;
+		box-shadow: 0px 95px 25px rgba(0,0,0,0.2);
+		transform: translateZ(-90px) rotateX( 65deg );
+	}
+
+.reveal.cube .slides>section.stack {
+	padding: 0;
+	background: none;
+}
+
+.reveal.cube .slides>section.past {
+	transform-origin: 100% 0%;
+	transform: translate3d(-100%, 0, 0) rotateY(-90deg);
+}
+
+.reveal.cube .slides>section.future {
+	transform-origin: 0% 0%;
+	transform: translate3d(100%, 0, 0) rotateY(90deg);
+}
+
+.reveal.cube .slides>section>section.past {
+	transform-origin: 0% 100%;
+	transform: translate3d(0, -100%, 0) rotateX(90deg);
+}
+
+.reveal.cube .slides>section>section.future {
+	transform-origin: 0% 0%;
+	transform: translate3d(0, 100%, 0) rotateX(-90deg);
+}
+
+
+/*********************************************
+ * PAGE TRANSITION
+ *
+ * WARNING:
+ * this is deprecated and will be removed in a
+ * future version.
+ *********************************************/
+
+.reveal.page .slides {
+	perspective-origin: 0% 50%;
+	perspective: 3000px;
+}
+
+.reveal.page .slides section {
+	padding: 30px;
+	min-height: 700px;
+	box-sizing: border-box;
+	transform-style: preserve-3d;
+}
+	.reveal.page .slides section.past {
+		z-index: 12;
+	}
+	.reveal.page .slides section:not(.stack):before {
+		content: '';
+		position: absolute;
+		display: block;
+		width: 100%;
+		height: 100%;
+		left: 0;
+		top: 0;
+		background: rgba(0,0,0,0.1);
+		transform: translateZ( -20px );
+	}
+	.reveal.page .slides section:not(.stack):after {
+		content: '';
+		position: absolute;
+		display: block;
+		width: 90%;
+		height: 30px;
+		left: 5%;
+		bottom: 0;
+		background: none;
+		z-index: 1;
+
+		border-radius: 4px;
+		box-shadow: 0px 95px 25px rgba(0,0,0,0.2);
+
+		-webkit-transform: translateZ(-90px) rotateX( 65deg );
+	}
+
+.reveal.page .slides>section.stack {
+	padding: 0;
+	background: none;
+}
+
+.reveal.page .slides>section.past {
+	transform-origin: 0% 0%;
+	transform: translate3d(-40%, 0, 0) rotateY(-80deg);
+}
+
+.reveal.page .slides>section.future {
+	transform-origin: 100% 0%;
+	transform: translate3d(0, 0, 0);
+}
+
+.reveal.page .slides>section>section.past {
+	transform-origin: 0% 0%;
+	transform: translate3d(0, -40%, 0) rotateX(80deg);
+}
+
+.reveal.page .slides>section>section.future {
+	transform-origin: 0% 100%;
+	transform: translate3d(0, 0, 0);
+}
+
+
+/*********************************************
+ * FADE TRANSITION
+ *********************************************/
+
+.reveal .slides section[data-transition=fade],
+.reveal.fade .slides section:not([data-transition]),
+.reveal.fade .slides>section>section:not([data-transition]) {
+	transform: none;
+	transition: opacity 0.5s;
+}
+
+
+.reveal.fade.overview .slides section,
+.reveal.fade.overview .slides>section>section {
+	transition: none;
+}
+
+
+/*********************************************
+ * NO TRANSITION
+ *********************************************/
+
+@include transition-global(none) {
+	transform: none;
+	transition: none;
+}
+
+
+/*********************************************
+ * PAUSED MODE
+ *********************************************/
+
+.reveal .pause-overlay {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background: black;
+	visibility: hidden;
+	opacity: 0;
+	z-index: 100;
+	transition: all 1s ease;
+}
+
+.reveal .pause-overlay .resume-button {
+	position: absolute;
+	bottom: 20px;
+	right: 20px;
+	color: #ccc;
+	border-radius: 2px;
+	padding: 6px 14px;
+	border: 2px solid #ccc;
+	font-size: 16px;
+	background: transparent;
+	cursor: pointer;
+
+	&:hover {
+		color: #fff;
+		border-color: #fff;
+	}
+}
+
+.reveal.paused .pause-overlay {
+	visibility: visible;
+	opacity: 1;
+}
+
+
+/*********************************************
+ * FALLBACK
+ *********************************************/
+
+.no-transforms {
+	overflow-y: auto;
+}
+
+.no-transforms .reveal {
+	overflow: visible;
+}
+
+.no-transforms .reveal .slides {
+	position: relative;
+	width: 80%;
+	max-width: 1280px;
+	height: auto;
+	top: 0;
+	margin: 0 auto;
+	text-align: center;
+}
+
+.no-transforms .reveal .controls,
+.no-transforms .reveal .progress {
+	display: none;
+}
+
+.no-transforms .reveal .slides section {
+	display: block;
+	opacity: 1;
+	position: relative;
+	height: auto;
+	min-height: 0;
+	top: 0;
+	left: 0;
+	margin: 10vh 0;
+	margin: 70px 0;
+	transform: none;
+}
+
+.reveal .no-transition,
+.reveal .no-transition * {
+	transition: none !important;
+}
+
+
+/*********************************************
+ * PER-SLIDE BACKGROUNDS
+ *********************************************/
+
+.reveal .backgrounds {
+	position: absolute;
+	width: 100%;
+	height: 100%;
+	top: 0;
+	left: 0;
+	perspective: 600px;
+}
+	.reveal .slide-background {
+		display: none;
+		position: absolute;
+		width: 100%;
+		height: 100%;
+		opacity: 0;
+		visibility: hidden;
+		overflow: hidden;
+
+		background-color: rgba( 0, 0, 0, 0 );
+
+		transition: all 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+	}
+
+	.reveal .slide-background-content {
+		position: absolute;
+		width: 100%;
+		height: 100%;
+
+		background-position: 50% 50%;
+		background-repeat: no-repeat;
+		background-size: cover;
+	}
+
+	.reveal .slide-background.stack {
+		display: block;
+	}
+
+	.reveal .slide-background.present {
+		opacity: 1;
+		visibility: visible;
+		z-index: 2;
+	}
+
+	.print-pdf .reveal .slide-background {
+		opacity: 1 !important;
+		visibility: visible !important;
+	}
+
+/* Video backgrounds */
+.reveal .slide-background video {
+	position: absolute;
+	width: 100%;
+	height: 100%;
+	max-width: none;
+	max-height: none;
+	top: 0;
+	left: 0;
+	object-fit: cover;
+}
+	.reveal .slide-background[data-background-size="contain"] video {
+		object-fit: contain;
+	}
+
+/* Immediate transition style */
+.reveal[data-background-transition=none]>.backgrounds .slide-background,
+.reveal>.backgrounds .slide-background[data-background-transition=none] {
+	transition: none;
+}
+
+/* Slide */
+.reveal[data-background-transition=slide]>.backgrounds .slide-background,
+.reveal>.backgrounds .slide-background[data-background-transition=slide] {
+	opacity: 1;
+	backface-visibility: hidden;
+}
+	.reveal[data-background-transition=slide]>.backgrounds .slide-background.past,
+	.reveal>.backgrounds .slide-background.past[data-background-transition=slide] {
+		transform: translate(-100%, 0);
+	}
+	.reveal[data-background-transition=slide]>.backgrounds .slide-background.future,
+	.reveal>.backgrounds .slide-background.future[data-background-transition=slide] {
+		transform: translate(100%, 0);
+	}
+
+	.reveal[data-background-transition=slide]>.backgrounds .slide-background>.slide-background.past,
+	.reveal>.backgrounds .slide-background>.slide-background.past[data-background-transition=slide] {
+		transform: translate(0, -100%);
+	}
+	.reveal[data-background-transition=slide]>.backgrounds .slide-background>.slide-background.future,
+	.reveal>.backgrounds .slide-background>.slide-background.future[data-background-transition=slide] {
+		transform: translate(0, 100%);
+	}
+
+
+/* Convex */
+.reveal[data-background-transition=convex]>.backgrounds .slide-background.past,
+.reveal>.backgrounds .slide-background.past[data-background-transition=convex] {
+	opacity: 0;
+	transform: translate3d(-100%, 0, 0) rotateY(-90deg) translate3d(-100%, 0, 0);
+}
+.reveal[data-background-transition=convex]>.backgrounds .slide-background.future,
+.reveal>.backgrounds .slide-background.future[data-background-transition=convex] {
+	opacity: 0;
+	transform: translate3d(100%, 0, 0) rotateY(90deg) translate3d(100%, 0, 0);
+}
+
+.reveal[data-background-transition=convex]>.backgrounds .slide-background>.slide-background.past,
+.reveal>.backgrounds .slide-background>.slide-background.past[data-background-transition=convex] {
+	opacity: 0;
+	transform: translate3d(0, -100%, 0) rotateX(90deg) translate3d(0, -100%, 0);
+}
+.reveal[data-background-transition=convex]>.backgrounds .slide-background>.slide-background.future,
+.reveal>.backgrounds .slide-background>.slide-background.future[data-background-transition=convex] {
+	opacity: 0;
+	transform: translate3d(0, 100%, 0) rotateX(-90deg) translate3d(0, 100%, 0);
+}
+
+
+/* Concave */
+.reveal[data-background-transition=concave]>.backgrounds .slide-background.past,
+.reveal>.backgrounds .slide-background.past[data-background-transition=concave] {
+	opacity: 0;
+	transform: translate3d(-100%, 0, 0) rotateY(90deg) translate3d(-100%, 0, 0);
+}
+.reveal[data-background-transition=concave]>.backgrounds .slide-background.future,
+.reveal>.backgrounds .slide-background.future[data-background-transition=concave] {
+	opacity: 0;
+	transform: translate3d(100%, 0, 0) rotateY(-90deg) translate3d(100%, 0, 0);
+}
+
+.reveal[data-background-transition=concave]>.backgrounds .slide-background>.slide-background.past,
+.reveal>.backgrounds .slide-background>.slide-background.past[data-background-transition=concave] {
+	opacity: 0;
+	transform: translate3d(0, -100%, 0) rotateX(-90deg) translate3d(0, -100%, 0);
+}
+.reveal[data-background-transition=concave]>.backgrounds .slide-background>.slide-background.future,
+.reveal>.backgrounds .slide-background>.slide-background.future[data-background-transition=concave] {
+	opacity: 0;
+	transform: translate3d(0, 100%, 0) rotateX(90deg) translate3d(0, 100%, 0);
+}
+
+/* Zoom */
+.reveal[data-background-transition=zoom]>.backgrounds .slide-background,
+.reveal>.backgrounds .slide-background[data-background-transition=zoom] {
+	transition-timing-function: ease;
+}
+
+.reveal[data-background-transition=zoom]>.backgrounds .slide-background.past,
+.reveal>.backgrounds .slide-background.past[data-background-transition=zoom] {
+	opacity: 0;
+	visibility: hidden;
+	transform: scale(16);
+}
+.reveal[data-background-transition=zoom]>.backgrounds .slide-background.future,
+.reveal>.backgrounds .slide-background.future[data-background-transition=zoom] {
+	opacity: 0;
+	visibility: hidden;
+	transform: scale(0.2);
+}
+
+.reveal[data-background-transition=zoom]>.backgrounds .slide-background>.slide-background.past,
+.reveal>.backgrounds .slide-background>.slide-background.past[data-background-transition=zoom] {
+	opacity: 0;
+		visibility: hidden;
+		transform: scale(16);
+}
+.reveal[data-background-transition=zoom]>.backgrounds .slide-background>.slide-background.future,
+.reveal>.backgrounds .slide-background>.slide-background.future[data-background-transition=zoom] {
+	opacity: 0;
+	visibility: hidden;
+	transform: scale(0.2);
+}
+
+
+/* Global transition speed settings */
+.reveal[data-transition-speed="fast"]>.backgrounds .slide-background {
+	transition-duration: 400ms;
+}
+.reveal[data-transition-speed="slow"]>.backgrounds .slide-background {
+	transition-duration: 1200ms;
+}
+
+
+/*********************************************
+ * OVERVIEW
+ *********************************************/
+
+.reveal.overview {
+	perspective-origin: 50% 50%;
+	perspective: 700px;
+
+	.slides {
+		// Fixes overview rendering errors in FF48+, not applied to
+		// other browsers since it degrades performance
+		-moz-transform-style: preserve-3d;
+	}
+
+	.slides section {
+		height: 100%;
+		top: 0 !important;
+		opacity: 1 !important;
+		overflow: hidden;
+		visibility: visible !important;
+		cursor: pointer;
+		box-sizing: border-box;
+	}
+	.slides section:hover,
+	.slides section.present {
+		outline: 10px solid rgba(150,150,150,0.4);
+		outline-offset: 10px;
+	}
+	.slides section .fragment {
+		opacity: 1;
+		transition: none;
+	}
+	.slides section:after,
+	.slides section:before {
+		display: none !important;
+	}
+	.slides>section.stack {
+		padding: 0;
+		top: 0 !important;
+		background: none;
+		outline: none;
+		overflow: visible;
+	}
+
+	.backgrounds {
+		perspective: inherit;
+
+		// Fixes overview rendering errors in FF48+, not applied to
+		// other browsers since it degrades performance
+		-moz-transform-style: preserve-3d;
+	}
+
+	.backgrounds .slide-background {
+		opacity: 1;
+		visibility: visible;
+
+		// This can't be applied to the slide itself in Safari
+		outline: 10px solid rgba(150,150,150,0.1);
+		outline-offset: 10px;
+	}
+
+	.backgrounds .slide-background.stack {
+		overflow: visible;
+	}
+}
+
+// Disable transitions transitions while we're activating
+// or deactivating the overview mode.
+.reveal.overview .slides section,
+.reveal.overview-deactivating .slides section {
+	transition: none;
+}
+
+.reveal.overview .backgrounds .slide-background,
+.reveal.overview-deactivating .backgrounds .slide-background {
+	transition: none;
+}
+
+
+/*********************************************
+ * RTL SUPPORT
+ *********************************************/
+
+.reveal.rtl .slides,
+.reveal.rtl .slides h1,
+.reveal.rtl .slides h2,
+.reveal.rtl .slides h3,
+.reveal.rtl .slides h4,
+.reveal.rtl .slides h5,
+.reveal.rtl .slides h6 {
+	direction: rtl;
+	font-family: sans-serif;
+}
+
+.reveal.rtl pre,
+.reveal.rtl code {
+	direction: ltr;
+}
+
+.reveal.rtl ol,
+.reveal.rtl ul {
+	text-align: right;
+}
+
+.reveal.rtl .progress span {
+	float: right
+}
+
+/*********************************************
+ * PARALLAX BACKGROUND
+ *********************************************/
+
+.reveal.has-parallax-background .backgrounds {
+	transition: all 0.8s ease;
+}
+
+/* Global transition speed settings */
+.reveal.has-parallax-background[data-transition-speed="fast"] .backgrounds {
+	transition-duration: 400ms;
+}
+.reveal.has-parallax-background[data-transition-speed="slow"] .backgrounds {
+	transition-duration: 1200ms;
+}
+
+
+/*********************************************
+ * OVERLAY FOR LINK PREVIEWS AND HELP
+ *********************************************/
+
+.reveal > .overlay {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	z-index: 1000;
+	background: rgba( 0, 0, 0, 0.9 );
+	opacity: 0;
+	visibility: hidden;
+	transition: all 0.3s ease;
+}
+	.reveal > .overlay.visible {
+		opacity: 1;
+		visibility: visible;
+	}
+
+	.reveal > .overlay .spinner {
+		position: absolute;
+		display: block;
+		top: 50%;
+		left: 50%;
+		width: 32px;
+		height: 32px;
+		margin: -16px 0 0 -16px;
+		z-index: 10;
+		background-image: url(data:image/gif;base64,R0lGODlhIAAgAPMAAJmZmf%2F%2F%2F6%2Bvr8nJybW1tcDAwOjo6Nvb26ioqKOjo7Ozs%2FLy8vz8%2FAAAAAAAAAAAACH%2FC05FVFNDQVBFMi4wAwEAAAAh%2FhpDcmVhdGVkIHdpdGggYWpheGxvYWQuaW5mbwAh%2BQQJCgAAACwAAAAAIAAgAAAE5xDISWlhperN52JLhSSdRgwVo1ICQZRUsiwHpTJT4iowNS8vyW2icCF6k8HMMBkCEDskxTBDAZwuAkkqIfxIQyhBQBFvAQSDITM5VDW6XNE4KagNh6Bgwe60smQUB3d4Rz1ZBApnFASDd0hihh12BkE9kjAJVlycXIg7CQIFA6SlnJ87paqbSKiKoqusnbMdmDC2tXQlkUhziYtyWTxIfy6BE8WJt5YJvpJivxNaGmLHT0VnOgSYf0dZXS7APdpB309RnHOG5gDqXGLDaC457D1zZ%2FV%2FnmOM82XiHRLYKhKP1oZmADdEAAAh%2BQQJCgAAACwAAAAAIAAgAAAE6hDISWlZpOrNp1lGNRSdRpDUolIGw5RUYhhHukqFu8DsrEyqnWThGvAmhVlteBvojpTDDBUEIFwMFBRAmBkSgOrBFZogCASwBDEY%2FCZSg7GSE0gSCjQBMVG023xWBhklAnoEdhQEfyNqMIcKjhRsjEdnezB%2BA4k8gTwJhFuiW4dokXiloUepBAp5qaKpp6%2BHo7aWW54wl7obvEe0kRuoplCGepwSx2jJvqHEmGt6whJpGpfJCHmOoNHKaHx61WiSR92E4lbFoq%2BB6QDtuetcaBPnW6%2BO7wDHpIiK9SaVK5GgV543tzjgGcghAgAh%2BQQJCgAAACwAAAAAIAAgAAAE7hDISSkxpOrN5zFHNWRdhSiVoVLHspRUMoyUakyEe8PTPCATW9A14E0UvuAKMNAZKYUZCiBMuBakSQKG8G2FzUWox2AUtAQFcBKlVQoLgQReZhQlCIJesQXI5B0CBnUMOxMCenoCfTCEWBsJColTMANldx15BGs8B5wlCZ9Po6OJkwmRpnqkqnuSrayqfKmqpLajoiW5HJq7FL1Gr2mMMcKUMIiJgIemy7xZtJsTmsM4xHiKv5KMCXqfyUCJEonXPN2rAOIAmsfB3uPoAK%2B%2BG%2Bw48edZPK%2BM6hLJpQg484enXIdQFSS1u6UhksENEQAAIfkECQoAAAAsAAAAACAAIAAABOcQyEmpGKLqzWcZRVUQnZYg1aBSh2GUVEIQ2aQOE%2BG%2BcD4ntpWkZQj1JIiZIogDFFyHI0UxQwFugMSOFIPJftfVAEoZLBbcLEFhlQiqGp1Vd140AUklUN3eCA51C1EWMzMCezCBBmkxVIVHBWd3HHl9JQOIJSdSnJ0TDKChCwUJjoWMPaGqDKannasMo6WnM562R5YluZRwur0wpgqZE7NKUm%2BFNRPIhjBJxKZteWuIBMN4zRMIVIhffcgojwCF117i4nlLnY5ztRLsnOk%2BaV%2BoJY7V7m76PdkS4trKcdg0Zc0tTcKkRAAAIfkECQoAAAAsAAAAACAAIAAABO4QyEkpKqjqzScpRaVkXZWQEximw1BSCUEIlDohrft6cpKCk5xid5MNJTaAIkekKGQkWyKHkvhKsR7ARmitkAYDYRIbUQRQjWBwJRzChi9CRlBcY1UN4g0%2FVNB0AlcvcAYHRyZPdEQFYV8ccwR5HWxEJ02YmRMLnJ1xCYp0Y5idpQuhopmmC2KgojKasUQDk5BNAwwMOh2RtRq5uQuPZKGIJQIGwAwGf6I0JXMpC8C7kXWDBINFMxS4DKMAWVWAGYsAdNqW5uaRxkSKJOZKaU3tPOBZ4DuK2LATgJhkPJMgTwKCdFjyPHEnKxFCDhEAACH5BAkKAAAALAAAAAAgACAAAATzEMhJaVKp6s2nIkolIJ2WkBShpkVRWqqQrhLSEu9MZJKK9y1ZrqYK9WiClmvoUaF8gIQSNeF1Er4MNFn4SRSDARWroAIETg1iVwuHjYB1kYc1mwruwXKC9gmsJXliGxc%2BXiUCby9ydh1sOSdMkpMTBpaXBzsfhoc5l58Gm5yToAaZhaOUqjkDgCWNHAULCwOLaTmzswadEqggQwgHuQsHIoZCHQMMQgQGubVEcxOPFAcMDAYUA85eWARmfSRQCdcMe0zeP1AAygwLlJtPNAAL19DARdPzBOWSm1brJBi45soRAWQAAkrQIykShQ9wVhHCwCQCACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiRMDjI0Fd30%2FiI2UA5GSS5UDj2l6NoqgOgN4gksEBgYFf0FDqKgHnyZ9OX8HrgYHdHpcHQULXAS2qKpENRg7eAMLC7kTBaixUYFkKAzWAAnLC7FLVxLWDBLKCwaKTULgEwbLA4hJtOkSBNqITT3xEgfLpBtzE%2FjiuL04RGEBgwWhShRgQExHBAAh%2BQQJCgAAACwAAAAAIAAgAAAE7xDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfZiCqGk5dTESJeaOAlClzsJsqwiJwiqnFrb2nS9kmIcgEsjQydLiIlHehhpejaIjzh9eomSjZR%2BipslWIRLAgMDOR2DOqKogTB9pCUJBagDBXR6XB0EBkIIsaRsGGMMAxoDBgYHTKJiUYEGDAzHC9EACcUGkIgFzgwZ0QsSBcXHiQvOwgDdEwfFs0sDzt4S6BK4xYjkDOzn0unFeBzOBijIm1Dgmg5YFQwsCMjp1oJ8LyIAACH5BAkKAAAALAAAAAAgACAAAATwEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GGl6NoiPOH16iZKNlH6KmyWFOggHhEEvAwwMA0N9GBsEC6amhnVcEwavDAazGwIDaH1ipaYLBUTCGgQDA8NdHz0FpqgTBwsLqAbWAAnIA4FWKdMLGdYGEgraigbT0OITBcg5QwPT4xLrROZL6AuQAPUS7bxLpoWidY0JtxLHKhwwMJBTHgPKdEQAACH5BAkKAAAALAAAAAAgACAAAATrEMhJaVKp6s2nIkqFZF2VIBWhUsJaTokqUCoBq%2BE71SRQeyqUToLA7VxF0JDyIQh%2FMVVPMt1ECZlfcjZJ9mIKoaTl1MRIl5o4CUKXOwmyrCInCKqcWtvadL2SYhyASyNDJ0uIiUd6GAULDJCRiXo1CpGXDJOUjY%2BYip9DhToJA4RBLwMLCwVDfRgbBAaqqoZ1XBMHswsHtxtFaH1iqaoGNgAIxRpbFAgfPQSqpbgGBqUD1wBXeCYp1AYZ19JJOYgH1KwA4UBvQwXUBxPqVD9L3sbp2BNk2xvvFPJd%2BMFCN6HAAIKgNggY0KtEBAAh%2BQQJCgAAACwAAAAAIAAgAAAE6BDISWlSqerNpyJKhWRdlSAVoVLCWk6JKlAqAavhO9UkUHsqlE6CwO1cRdCQ8iEIfzFVTzLdRAmZX3I2SfYIDMaAFdTESJeaEDAIMxYFqrOUaNW4E4ObYcCXaiBVEgULe0NJaxxtYksjh2NLkZISgDgJhHthkpU4mW6blRiYmZOlh4JWkDqILwUGBnE6TYEbCgevr0N1gH4At7gHiRpFaLNrrq8HNgAJA70AWxQIH1%2BvsYMDAzZQPC9VCNkDWUhGkuE5PxJNwiUK4UfLzOlD4WvzAHaoG9nxPi5d%2BjYUqfAhhykOFwJWiAAAIfkECQoAAAAsAAAAACAAIAAABPAQyElpUqnqzaciSoVkXVUMFaFSwlpOCcMYlErAavhOMnNLNo8KsZsMZItJEIDIFSkLGQoQTNhIsFehRww2CQLKF0tYGKYSg%2BygsZIuNqJksKgbfgIGepNo2cIUB3V1B3IvNiBYNQaDSTtfhhx0CwVPI0UJe0%2Bbm4g5VgcGoqOcnjmjqDSdnhgEoamcsZuXO1aWQy8KAwOAuTYYGwi7w5h%2BKr0SJ8MFihpNbx%2B4Erq7BYBuzsdiH1jCAzoSfl0rVirNbRXlBBlLX%2BBP0XJLAPGzTkAuAOqb0WT5AH7OcdCm5B8TgRwSRKIHQtaLCwg1RAAAOwAAAAAAAAAAAA%3D%3D);
+
+		visibility: visible;
+		opacity: 0.6;
+		transition: all 0.3s ease;
+	}
+
+	.reveal > .overlay header {
+		position: absolute;
+		left: 0;
+		top: 0;
+		width: 100%;
+		height: 40px;
+		z-index: 2;
+		border-bottom: 1px solid #222;
+	}
+		.reveal > .overlay header a {
+			display: inline-block;
+			width: 40px;
+			height: 40px;
+			line-height: 36px;
+			padding: 0 10px;
+			float: right;
+			opacity: 0.6;
+
+			box-sizing: border-box;
+		}
+			.reveal > .overlay header a:hover {
+				opacity: 1;
+			}
+			.reveal > .overlay header a .icon {
+				display: inline-block;
+				width: 20px;
+				height: 20px;
+
+				background-position: 50% 50%;
+				background-size: 100%;
+				background-repeat: no-repeat;
+			}
+			.reveal > .overlay header a.close .icon {
+				background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAABkklEQVRYR8WX4VHDMAxG6wnoJrABZQPYBCaBTWAD2g1gE5gg6OOsXuxIlr40d81dfrSJ9V4c2VLK7spHuTJ/5wpM07QXuXc5X0opX2tEJcadjHuV80li/FgxTIEK/5QBCICBD6xEhSMGHgQPgBgLiYVAB1dpSqKDawxTohFw4JSEA3clzgIBPCURwE2JucBR7rhPJJv5OpJwDX+SfDjgx1wACQeJG1aChP9K/IMmdZ8DtESV1WyP3Bt4MwM6sj4NMxMYiqUWHQu4KYA/SYkIjOsm3BXYWMKFDwU2khjCQ4ELJUJ4SmClRArOCmSXGuKma0fYD5CbzHxFpCSGAhfAVSSUGDUk2BWZaff2g6GE15BsBQ9nwmpIGDiyHQddwNTMKkbZaf9fajXQca1EX44puJZUsnY0ObGmITE3GVLCbEhQUjGVt146j6oasWN+49Vph2w1pZ5EansNZqKBm1txbU57iRRcZ86RWMDdWtBJUHBHwoQPi1GV+JCbntmvok7iTX4/Up9mgyTc/FJYDTcndgH/AA5A/CHsyEkVAAAAAElFTkSuQmCC);
+			}
+			.reveal > .overlay header a.external .icon {
+				background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAcElEQVRYR+2WSQoAIQwEzf8f7XiOMkUQxUPlGkM3hVmiQfQR9GYnH1SsAQlI4DiBqkCMoNb9y2e90IAEJPAcgdznU9+engMaeJ7Azh5Y1U67gAho4DqBqmB1buAf0MB1AlVBek83ZPkmJMGc1wAR+AAqod/B97TRpQAAAABJRU5ErkJggg==);
+			}
+
+	.reveal > .overlay .viewport {
+		position: absolute;
+		display: flex;
+		top: 40px;
+		right: 0;
+		bottom: 0;
+		left: 0;
+	}
+
+	.reveal > .overlay.overlay-preview .viewport iframe {
+		width: 100%;
+		height: 100%;
+		max-width: 100%;
+		max-height: 100%;
+		border: 0;
+
+		opacity: 0;
+		visibility: hidden;
+		transition: all 0.3s ease;
+	}
+
+	.reveal > .overlay.overlay-preview.loaded .viewport iframe {
+		opacity: 1;
+		visibility: visible;
+	}
+
+	.reveal > .overlay.overlay-preview.loaded .viewport-inner  {
+		position: absolute;
+		z-index: -1;
+		left: 0;
+		top: 45%;
+		width: 100%;
+		text-align: center;
+		letter-spacing: normal;
+	}
+	.reveal > .overlay.overlay-preview .x-frame-error  {
+		opacity: 0;
+		transition: opacity 0.3s ease 0.3s;
+	}
+	.reveal > .overlay.overlay-preview.loaded .x-frame-error  {
+		opacity: 1;
+	}
+
+	.reveal > .overlay.overlay-preview.loaded .spinner {
+		opacity: 0;
+		visibility: hidden;
+		transform: scale(0.2);
+	}
+
+	.reveal > .overlay.overlay-help .viewport {
+		overflow: auto;
+		color: #fff;
+	}
+
+	.reveal > .overlay.overlay-help .viewport .viewport-inner {
+		width: 600px;
+		margin: auto;
+		padding: 20px 20px 80px 20px;
+		text-align: center;
+		letter-spacing: normal;
+	}
+
+	.reveal > .overlay.overlay-help .viewport .viewport-inner .title {
+		font-size: 20px;
+	}
+
+	.reveal > .overlay.overlay-help .viewport .viewport-inner table {
+		border: 1px solid #fff;
+		border-collapse: collapse;
+		font-size: 16px;
+	}
+
+	.reveal > .overlay.overlay-help .viewport .viewport-inner table th,
+	.reveal > .overlay.overlay-help .viewport .viewport-inner table td {
+		width: 200px;
+		padding: 14px;
+		border: 1px solid #fff;
+		vertical-align: middle;
+	}
+
+	.reveal > .overlay.overlay-help .viewport .viewport-inner table th {
+		padding-top: 20px;
+		padding-bottom: 20px;
+	}
+
+
+/*********************************************
+ * PLAYBACK COMPONENT
+ *********************************************/
+
+.reveal .playback {
+	position: absolute;
+	left: 15px;
+	bottom: 20px;
+	z-index: 30;
+	cursor: pointer;
+	transition: all 400ms ease;
+	-webkit-tap-highlight-color: rgba( 0, 0, 0, 0 );
+}
+
+.reveal.overview .playback {
+	opacity: 0;
+	visibility: hidden;
+}
+
+
+/*********************************************
+ * CODE HIGHLGIHTING
+ *********************************************/
+
+.reveal .hljs table {
+	margin: initial;
+}
+
+.reveal .hljs-ln-code,
+.reveal .hljs-ln-numbers {
+	padding: 0;
+	border: 0;
+}
+
+.reveal .hljs-ln-numbers {
+	opacity: 0.6;
+	padding-right: 0.75em;
+	text-align: right;
+	vertical-align: top;
+}
+
+.reveal .hljs.has-highlights tr:not(.highlight-line) {
+	opacity: 0.4;
+}
+
+.reveal .hljs:not(:first-child).fragment {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	box-sizing: border-box;
+}
+
+
+/*********************************************
+ * ROLLING LINKS
+ *********************************************/
+
+.reveal .roll {
+	display: inline-block;
+	line-height: 1.2;
+	overflow: hidden;
+
+	vertical-align: top;
+	perspective: 400px;
+	perspective-origin: 50% 50%;
+}
+	.reveal .roll:hover {
+		background: none;
+		text-shadow: none;
+	}
+.reveal .roll span {
+	display: block;
+	position: relative;
+	padding: 0 2px;
+
+	pointer-events: none;
+	transition: all 400ms ease;
+	transform-origin: 50% 0%;
+	transform-style: preserve-3d;
+	backface-visibility: hidden;
+}
+	.reveal .roll:hover span {
+	    background: rgba(0,0,0,0.5);
+	    transform: translate3d( 0px, 0px, -45px ) rotateX( 90deg );
+	}
+.reveal .roll span:after {
+	content: attr(data-title);
+
+	display: block;
+	position: absolute;
+	left: 0;
+	top: 0;
+	padding: 0 2px;
+	backface-visibility: hidden;
+	transform-origin: 50% 0%;
+	transform: translate3d( 0px, 110%, 0px ) rotateX( -90deg );
+}
+
+
+/*********************************************
+ * SPEAKER NOTES
+ *********************************************/
+
+$notesWidthPercent: 25%;
+
+// Hide on-page notes
+.reveal aside.notes {
+	display: none;
+}
+
+// An interface element that can optionally be used to show the
+// speaker notes to all viewers, on top of the presentation
+.reveal .speaker-notes {
+	display: none;
+	position: absolute;
+	width: $notesWidthPercent / (1-$notesWidthPercent/100) * 1%;
+	height: 100%;
+	top: 0;
+	left: 100%;
+	padding: 14px 18px 14px 18px;
+	z-index: 1;
+	font-size: 18px;
+	line-height: 1.4;
+	border: 1px solid rgba( 0, 0, 0, 0.05 );
+	color: #222;
+	background-color: #f5f5f5;
+	overflow: auto;
+	box-sizing: border-box;
+	text-align: left;
+	font-family: Helvetica, sans-serif;
+	-webkit-overflow-scrolling: touch;
+
+	.notes-placeholder {
+		color: #ccc;
+		font-style: italic;
+	}
+
+	&:focus {
+		outline: none;
+	}
+
+	&:before {
+		content: 'Speaker notes';
+		display: block;
+		margin-bottom: 10px;
+		opacity: 0.5;
+	}
+}
+
+
+.reveal.show-notes {
+	max-width: 100% - $notesWidthPercent;
+	overflow: visible;
+}
+
+.reveal.show-notes .speaker-notes {
+	display: block;
+}
+
+@media screen and (min-width: 1600px) {
+	.reveal .speaker-notes {
+		font-size: 20px;
+	}
+}
+
+@media screen and (max-width: 1024px) {
+	.reveal.show-notes {
+		border-left: 0;
+		max-width: none;
+		max-height: 70%;
+		max-height: 70vh;
+		overflow: visible;
+	}
+
+	.reveal.show-notes .speaker-notes {
+		top: 100%;
+		left: 0;
+		width: 100%;
+		height: (30/0.7)*1%;
+		height: 30vh;
+		border: 0;
+	}
+}
+
+@media screen and (max-width: 600px) {
+	.reveal.show-notes {
+		max-height: 60%;
+		max-height: 60vh;
+	}
+
+	.reveal.show-notes .speaker-notes {
+		top: 100%;
+		height: (40/0.6)*1%;
+		height: 40vh;
+	}
+
+	.reveal .speaker-notes {
+		font-size: 14px;
+	}
+}
+
+
+/*********************************************
+ * ZOOM PLUGIN
+ *********************************************/
+
+.zoomed .reveal *,
+.zoomed .reveal *:before,
+.zoomed .reveal *:after {
+	backface-visibility: visible !important;
+}
+
+.zoomed .reveal .progress,
+.zoomed .reveal .controls {
+	opacity: 0;
+}
+
+.zoomed .reveal .roll span {
+	background: none;
+}
+
+.zoomed .reveal .roll span:after {
+	visibility: hidden;
+}
diff --git a/static/reveal.js/css/theme/README.md b/static/reveal.js/css/theme/README.md
new file mode 100644
index 0000000..5ebe72a
--- /dev/null
+++ b/static/reveal.js/css/theme/README.md
@@ -0,0 +1,21 @@
+## Dependencies
+
+Themes are written using Sass to keep things modular and reduce the need for repeated selectors across files. Make sure that you have the reveal.js development environment including the Grunt dependencies installed before proceeding: https://github.com/hakimel/reveal.js#full-setup
+
+## Creating a Theme
+
+To create your own theme, start by duplicating a ```.scss``` file in [/css/theme/source](https://github.com/hakimel/reveal.js/blob/master/css/theme/source). It will be automatically compiled by Grunt from Sass to CSS (see the [Gruntfile](https://github.com/hakimel/reveal.js/blob/master/gruntfile.js)) when you run `npm run build -- css-themes`.
+
+Each theme file does four things in the following order:
+
+1. **Include [/css/theme/template/mixins.scss](https://github.com/hakimel/reveal.js/blob/master/css/theme/template/mixins.scss)**
+Shared utility functions.
+
+2. **Include [/css/theme/template/settings.scss](https://github.com/hakimel/reveal.js/blob/master/css/theme/template/settings.scss)**
+Declares a set of custom variables that the template file (step 4) expects. Can be overridden in step 3.
+
+3. **Override**
+This is where you override the default theme. Either by specifying variables (see [settings.scss](https://github.com/hakimel/reveal.js/blob/master/css/theme/template/settings.scss) for reference) or by adding any selectors and styles you please.
+
+4. **Include [/css/theme/template/theme.scss](https://github.com/hakimel/reveal.js/blob/master/css/theme/template/theme.scss)**
+The template theme file which will generate final CSS output based on the currently defined variables.
diff --git a/static/reveal.js/css/theme/beige.css b/static/reveal.js/css/theme/beige.css
new file mode 100644
index 0000000..615dd6d
--- /dev/null
+++ b/static/reveal.js/css/theme/beige.css
@@ -0,0 +1,277 @@
+/**
+ * Beige theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #f7f2d3;
+  background: -moz-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
+  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, white), color-stop(100%, #f7f2d3));
+  background: -webkit-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
+  background: -o-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
+  background: -ms-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
+  background: radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
+  background-color: #f7f3de; }
+
+.reveal {
+  font-family: "Lato", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #333; }
+
+::selection {
+  color: #fff;
+  background: rgba(79, 64, 28, 0.99);
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: rgba(79, 64, 28, 0.99);
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #333;
+  font-family: "League Gothic", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #8b743d;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #c0a86e;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #564826; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #333;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #8b743d;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #8b743d; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #8b743d; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #f7f3de; } }
diff --git a/static/reveal.js/css/theme/black.css b/static/reveal.js/css/theme/black.css
new file mode 100644
index 0000000..7dd88c2
--- /dev/null
+++ b/static/reveal.js/css/theme/black.css
@@ -0,0 +1,273 @@
+/**
+ * Black theme for reveal.js. This is the opposite of the 'white' theme.
+ *
+ * By Hakim El Hattab, http://hakim.se
+ */
+@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+section.has-light-background, section.has-light-background h1, section.has-light-background h2, section.has-light-background h3, section.has-light-background h4, section.has-light-background h5, section.has-light-background h6 {
+  color: #222; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #191919;
+  background-color: #191919; }
+
+.reveal {
+  font-family: "Source Sans Pro", Helvetica, sans-serif;
+  font-size: 42px;
+  font-weight: normal;
+  color: #fff; }
+
+::selection {
+  color: #fff;
+  background: #bee4fd;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #bee4fd;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #fff;
+  font-family: "Source Sans Pro", Helvetica, sans-serif;
+  font-weight: 600;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 2.5em; }
+
+.reveal h2 {
+  font-size: 1.6em; }
+
+.reveal h3 {
+  font-size: 1.3em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #42affa;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #8dcffc;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #068de9; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #fff;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #42affa;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #42affa; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #42affa; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #191919; } }
diff --git a/static/reveal.js/css/theme/blood.css b/static/reveal.js/css/theme/blood.css
new file mode 100644
index 0000000..5cbd488
--- /dev/null
+++ b/static/reveal.js/css/theme/blood.css
@@ -0,0 +1,296 @@
+/**
+ * Blood theme for reveal.js
+ * Author: Walther http://github.com/Walther
+ *
+ * Designed to be used with highlight.js theme
+ * "monokai_sublime.css" available from
+ * https://github.com/isagalaev/highlight.js/
+ *
+ * For other themes, change $codeBackground accordingly.
+ *
+ */
+@import url(https://fonts.googleapis.com/css?family=Ubuntu:300,700,300italic,700italic);
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #222;
+  background-color: #222; }
+
+.reveal {
+  font-family: Ubuntu, "sans-serif";
+  font-size: 40px;
+  font-weight: normal;
+  color: #eee; }
+
+::selection {
+  color: #fff;
+  background: #a23;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #a23;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #eee;
+  font-family: Ubuntu, "sans-serif";
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: 2px 2px 2px #222;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #a23;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #dd5566;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #6a1520; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #eee;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #a23;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #a23; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #a23; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #222; } }
+
+.reveal p {
+  font-weight: 300;
+  text-shadow: 1px 1px #222; }
+
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  font-weight: 700; }
+
+.reveal p code {
+  background-color: #23241f;
+  display: inline-block;
+  border-radius: 7px; }
+
+.reveal small code {
+  vertical-align: baseline; }
diff --git a/static/reveal.js/css/theme/league.css b/static/reveal.js/css/theme/league.css
new file mode 100644
index 0000000..f8fba4d
--- /dev/null
+++ b/static/reveal.js/css/theme/league.css
@@ -0,0 +1,279 @@
+/**
+ * League theme for reveal.js.
+ *
+ * This was the default theme pre-3.0.0.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #1c1e20;
+  background: -moz-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
+  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #555a5f), color-stop(100%, #1c1e20));
+  background: -webkit-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
+  background: -o-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
+  background: -ms-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
+  background: radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
+  background-color: #2b2b2b; }
+
+.reveal {
+  font-family: "Lato", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #eee; }
+
+::selection {
+  color: #fff;
+  background: #FF5E99;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #FF5E99;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #eee;
+  font-family: "League Gothic", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15); }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #13DAEC;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #71e9f4;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #0d99a5; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #eee;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #13DAEC;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #13DAEC; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #13DAEC; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #2b2b2b; } }
diff --git a/static/reveal.js/css/theme/moon.css b/static/reveal.js/css/theme/moon.css
new file mode 100644
index 0000000..d18f526
--- /dev/null
+++ b/static/reveal.js/css/theme/moon.css
@@ -0,0 +1,277 @@
+/**
+ * Solarized Dark theme for reveal.js.
+ * Author: Achim Staebler
+ */
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+/**
+ * Solarized colors by Ethan Schoonover
+ */
+html * {
+  color-profile: sRGB;
+  rendering-intent: auto; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #002b36;
+  background-color: #002b36; }
+
+.reveal {
+  font-family: "Lato", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #93a1a1; }
+
+::selection {
+  color: #fff;
+  background: #d33682;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #d33682;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #eee8d5;
+  font-family: "League Gothic", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #268bd2;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #78b9e6;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #1a6091; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #93a1a1;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #268bd2;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #268bd2; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #268bd2; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #002b36; } }
diff --git a/static/reveal.js/css/theme/night.css b/static/reveal.js/css/theme/night.css
new file mode 100644
index 0000000..f5ccb52
--- /dev/null
+++ b/static/reveal.js/css/theme/night.css
@@ -0,0 +1,271 @@
+/**
+ * Black theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+@import url(https://fonts.googleapis.com/css?family=Montserrat:700);
+@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #111;
+  background-color: #111; }
+
+.reveal {
+  font-family: "Open Sans", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #eee; }
+
+::selection {
+  color: #fff;
+  background: #e7ad52;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #e7ad52;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #eee;
+  font-family: "Montserrat", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: -0.03em;
+  text-transform: none;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #e7ad52;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #f3d7ac;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #d08a1d; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #eee;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #e7ad52;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #e7ad52; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #e7ad52; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #111; } }
diff --git a/static/reveal.js/css/theme/serif.css b/static/reveal.js/css/theme/serif.css
new file mode 100644
index 0000000..6514a6f
--- /dev/null
+++ b/static/reveal.js/css/theme/serif.css
@@ -0,0 +1,273 @@
+/**
+ * A simple theme for reveal.js presentations, similar
+ * to the default theme. The accent color is brown.
+ *
+ * This theme is Copyright (C) 2012-2013 Owen Versteeg, http://owenversteeg.com - it is MIT licensed.
+ */
+.reveal a {
+  line-height: 1.3em; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #F0F1EB;
+  background-color: #F0F1EB; }
+
+.reveal {
+  font-family: "Palatino Linotype", "Book Antiqua", Palatino, FreeSerif, serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #000; }
+
+::selection {
+  color: #fff;
+  background: #26351C;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #26351C;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #383D3D;
+  font-family: "Palatino Linotype", "Book Antiqua", Palatino, FreeSerif, serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: none;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #51483D;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #8b7c69;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #25211c; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #000;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #51483D;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #51483D; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #51483D; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #F0F1EB; } }
diff --git a/static/reveal.js/css/theme/simple.css b/static/reveal.js/css/theme/simple.css
new file mode 100644
index 0000000..a7a29a6
--- /dev/null
+++ b/static/reveal.js/css/theme/simple.css
@@ -0,0 +1,276 @@
+/**
+ * A simple theme for reveal.js presentations, similar
+ * to the default theme. The accent color is darkblue.
+ *
+ * This theme is Copyright (C) 2012 Owen Versteeg, https://github.com/StereotypicalApps. It is MIT licensed.
+ * reveal.js is Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+@import url(https://fonts.googleapis.com/css?family=News+Cycle:400,700);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #fff;
+  background-color: #fff; }
+
+.reveal {
+  font-family: "Lato", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #000; }
+
+::selection {
+  color: #fff;
+  background: rgba(0, 0, 0, 0.99);
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: rgba(0, 0, 0, 0.99);
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #000;
+  font-family: "News Cycle", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: none;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #00008B;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #0000f1;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #00003f; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #000;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #00008B;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #00008B; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #00008B; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #fff; } }
diff --git a/static/reveal.js/css/theme/sky.css b/static/reveal.js/css/theme/sky.css
new file mode 100644
index 0000000..d8734c9
--- /dev/null
+++ b/static/reveal.js/css/theme/sky.css
@@ -0,0 +1,280 @@
+/**
+ * Sky theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+@import url(https://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
+@import url(https://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
+.reveal a {
+  line-height: 1.3em; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #add9e4;
+  background: -moz-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
+  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #f7fbfc), color-stop(100%, #add9e4));
+  background: -webkit-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
+  background: -o-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
+  background: -ms-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
+  background: radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
+  background-color: #f7fbfc; }
+
+.reveal {
+  font-family: "Open Sans", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #333; }
+
+::selection {
+  color: #fff;
+  background: #134674;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #134674;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #333;
+  font-family: "Quicksand", sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: -0.08em;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #3b759e;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #74a7cb;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #264c66; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #333;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #3b759e;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #3b759e; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #3b759e; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #f7fbfc; } }
diff --git a/static/reveal.js/css/theme/solarized.css b/static/reveal.js/css/theme/solarized.css
new file mode 100644
index 0000000..f1a2b9e
--- /dev/null
+++ b/static/reveal.js/css/theme/solarized.css
@@ -0,0 +1,277 @@
+/**
+ * Solarized Light theme for reveal.js.
+ * Author: Achim Staebler
+ */
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+/**
+ * Solarized colors by Ethan Schoonover
+ */
+html * {
+  color-profile: sRGB;
+  rendering-intent: auto; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #fdf6e3;
+  background-color: #fdf6e3; }
+
+.reveal {
+  font-family: "Lato", sans-serif;
+  font-size: 40px;
+  font-weight: normal;
+  color: #657b83; }
+
+::selection {
+  color: #fff;
+  background: #d33682;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #d33682;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #586e75;
+  font-family: "League Gothic", Impact, sans-serif;
+  font-weight: normal;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 3.77em; }
+
+.reveal h2 {
+  font-size: 2.11em; }
+
+.reveal h3 {
+  font-size: 1.55em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #268bd2;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #78b9e6;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #1a6091; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #657b83;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #268bd2;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #268bd2; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #268bd2; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #fdf6e3; } }
diff --git a/static/reveal.js/css/theme/source/beige.scss b/static/reveal.js/css/theme/source/beige.scss
new file mode 100644
index 0000000..5564f53
--- /dev/null
+++ b/static/reveal.js/css/theme/source/beige.scss
@@ -0,0 +1,39 @@
+/**
+ * Beige theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+
+
+// Override theme settings (see ../template/settings.scss)
+$mainColor: #333;
+$headingColor: #333;
+$headingTextShadow: none;
+$backgroundColor: #f7f3de;
+$linkColor: #8b743d;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: rgba(79, 64, 28, 0.99);
+$heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0,0,0,.1), 0 0 5px rgba(0,0,0,.1), 0 1px 3px rgba(0,0,0,.3), 0 3px 5px rgba(0,0,0,.2), 0 5px 10px rgba(0,0,0,.25), 0 20px 20px rgba(0,0,0,.15);
+
+// Background generator
+@mixin bodyBackground() {
+	@include radial-gradient( rgba(247,242,211,1), rgba(255,255,255,1) );
+}
+
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/black.scss b/static/reveal.js/css/theme/source/black.scss
new file mode 100644
index 0000000..4720c8a
--- /dev/null
+++ b/static/reveal.js/css/theme/source/black.scss
@@ -0,0 +1,49 @@
+/**
+ * Black theme for reveal.js. This is the opposite of the 'white' theme.
+ *
+ * By Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #191919;
+
+$mainColor: #fff;
+$headingColor: #fff;
+
+$mainFontSize: 42px;
+$mainFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: normal;
+$headingTextTransform: uppercase;
+$headingFontWeight: 600;
+$linkColor: #42affa;
+$linkColorHover: lighten( $linkColor, 15% );
+$selectionBackgroundColor: lighten( $linkColor, 25% );
+
+$heading1Size: 2.5em;
+$heading2Size: 1.6em;
+$heading3Size: 1.3em;
+$heading4Size: 1.0em;
+
+section.has-light-background {
+	&, h1, h2, h3, h4, h5, h6 {
+		color: #222;
+	}
+}
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/blood.scss b/static/reveal.js/css/theme/source/blood.scss
new file mode 100644
index 0000000..4533fc0
--- /dev/null
+++ b/static/reveal.js/css/theme/source/blood.scss
@@ -0,0 +1,78 @@
+/**
+ * Blood theme for reveal.js
+ * Author: Walther http://github.com/Walther
+ *
+ * Designed to be used with highlight.js theme
+ * "monokai_sublime.css" available from
+ * https://github.com/isagalaev/highlight.js/
+ *
+ * For other themes, change $codeBackground accordingly.
+ *
+ */
+
+ // Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+// Include theme-specific fonts
+
+@import url(https://fonts.googleapis.com/css?family=Ubuntu:300,700,300italic,700italic);
+
+// Colors used in the theme
+$blood: #a23;
+$coal: #222;
+$codeBackground: #23241f;
+
+$backgroundColor: $coal;
+
+// Main text
+$mainFont: Ubuntu, 'sans-serif';
+$mainColor: #eee;
+
+// Headings
+$headingFont: Ubuntu, 'sans-serif';
+$headingTextShadow: 2px 2px 2px $coal;
+
+// h1 shadow, borrowed humbly from 
+// (c) Default theme by Hakim El Hattab
+$heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0,0,0,.1), 0 0 5px rgba(0,0,0,.1), 0 1px 3px rgba(0,0,0,.3), 0 3px 5px rgba(0,0,0,.2), 0 5px 10px rgba(0,0,0,.25), 0 20px 20px rgba(0,0,0,.15);
+
+// Links
+$linkColor: $blood;
+$linkColorHover: lighten( $linkColor, 20% );
+
+// Text selection
+$selectionBackgroundColor: $blood;
+$selectionColor: #fff;
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
+
+// some overrides after theme template import
+
+.reveal p {
+    font-weight: 300;
+    text-shadow: 1px 1px $coal;
+}
+
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+    font-weight: 700;
+}
+
+.reveal p code {
+    background-color: $codeBackground;
+    display: inline-block;
+    border-radius: 7px;
+}
+
+.reveal small code {
+    vertical-align: baseline;
+}
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/league.scss b/static/reveal.js/css/theme/source/league.scss
new file mode 100644
index 0000000..46ea04a
--- /dev/null
+++ b/static/reveal.js/css/theme/source/league.scss
@@ -0,0 +1,34 @@
+/**
+ * League theme for reveal.js.
+ *
+ * This was the default theme pre-3.0.0.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+
+// Override theme settings (see ../template/settings.scss)
+$headingTextShadow: 0px 0px 6px rgba(0,0,0,0.2);
+$heading1TextShadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0,0,0,.1), 0 0 5px rgba(0,0,0,.1), 0 1px 3px rgba(0,0,0,.3), 0 3px 5px rgba(0,0,0,.2), 0 5px 10px rgba(0,0,0,.25), 0 20px 20px rgba(0,0,0,.15);
+
+// Background generator
+@mixin bodyBackground() {
+	@include radial-gradient( rgba(28,30,32,1), rgba(85,90,95,1) );
+}
+
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/moon.scss b/static/reveal.js/css/theme/source/moon.scss
new file mode 100644
index 0000000..e47e5b5
--- /dev/null
+++ b/static/reveal.js/css/theme/source/moon.scss
@@ -0,0 +1,57 @@
+/**
+ * Solarized Dark theme for reveal.js.
+ * Author: Achim Staebler
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+
+/**
+ * Solarized colors by Ethan Schoonover
+ */
+html * {
+	color-profile: sRGB;
+	rendering-intent: auto;
+}
+
+// Solarized colors
+$base03:    #002b36;
+$base02:    #073642;
+$base01:    #586e75;
+$base00:    #657b83;
+$base0:     #839496;
+$base1:     #93a1a1;
+$base2:     #eee8d5;
+$base3:     #fdf6e3;
+$yellow:    #b58900;
+$orange:    #cb4b16;
+$red:       #dc322f;
+$magenta:   #d33682;
+$violet:    #6c71c4;
+$blue:      #268bd2;
+$cyan:      #2aa198;
+$green:     #859900;
+
+// Override theme settings (see ../template/settings.scss)
+$mainColor: $base1;
+$headingColor: $base2;
+$headingTextShadow: none;
+$backgroundColor: $base03;
+$linkColor: $blue;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: $magenta;
+
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
diff --git a/static/reveal.js/css/theme/source/night.scss b/static/reveal.js/css/theme/source/night.scss
new file mode 100644
index 0000000..d49a282
--- /dev/null
+++ b/static/reveal.js/css/theme/source/night.scss
@@ -0,0 +1,34 @@
+/**
+ * Black theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+@import url(https://fonts.googleapis.com/css?family=Montserrat:700);
+@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #111;
+
+$mainFont: 'Open Sans', sans-serif;
+$linkColor: #e7ad52;
+$linkColorHover: lighten( $linkColor, 20% );
+$headingFont: 'Montserrat', Impact, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: -0.03em;
+$headingTextTransform: none;
+$selectionBackgroundColor: #e7ad52;
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/serif.scss b/static/reveal.js/css/theme/source/serif.scss
new file mode 100644
index 0000000..ec3fcb3
--- /dev/null
+++ b/static/reveal.js/css/theme/source/serif.scss
@@ -0,0 +1,35 @@
+/**
+ * A simple theme for reveal.js presentations, similar
+ * to the default theme. The accent color is brown.
+ *
+ * This theme is Copyright (C) 2012-2013 Owen Versteeg, http://owenversteeg.com - it is MIT licensed.
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Override theme settings (see ../template/settings.scss)
+$mainFont: 'Palatino Linotype', 'Book Antiqua', Palatino, FreeSerif, serif;
+$mainColor: #000;
+$headingFont: 'Palatino Linotype', 'Book Antiqua', Palatino, FreeSerif, serif;
+$headingColor: #383D3D;
+$headingTextShadow: none;
+$headingTextTransform: none;
+$backgroundColor: #F0F1EB;
+$linkColor: #51483D;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: #26351C;
+
+.reveal a {
+  line-height: 1.3em;
+}
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
diff --git a/static/reveal.js/css/theme/source/simple.scss b/static/reveal.js/css/theme/source/simple.scss
new file mode 100644
index 0000000..394c9cd
--- /dev/null
+++ b/static/reveal.js/css/theme/source/simple.scss
@@ -0,0 +1,43 @@
+/**
+ * A simple theme for reveal.js presentations, similar
+ * to the default theme. The accent color is darkblue.
+ *
+ * This theme is Copyright (C) 2012 Owen Versteeg, https://github.com/StereotypicalApps. It is MIT licensed.
+ * reveal.js is Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(https://fonts.googleapis.com/css?family=News+Cycle:400,700);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+
+
+// Override theme settings (see ../template/settings.scss)
+$mainFont: 'Lato', sans-serif;
+$mainColor: #000;
+$headingFont: 'News Cycle', Impact, sans-serif;
+$headingColor: #000;
+$headingTextShadow: none;
+$headingTextTransform: none;
+$backgroundColor: #fff;
+$linkColor: #00008B;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: rgba(0, 0, 0, 0.99);
+
+section.has-dark-background {
+	&, h1, h2, h3, h4, h5, h6 {
+		color: #fff;
+	}
+}
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/source/sky.scss b/static/reveal.js/css/theme/source/sky.scss
new file mode 100644
index 0000000..3fee67c
--- /dev/null
+++ b/static/reveal.js/css/theme/source/sky.scss
@@ -0,0 +1,46 @@
+/**
+ * Sky theme for reveal.js.
+ *
+ * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(https://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
+@import url(https://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
+
+
+// Override theme settings (see ../template/settings.scss)
+$mainFont: 'Open Sans', sans-serif;
+$mainColor: #333;
+$headingFont: 'Quicksand', sans-serif;
+$headingColor: #333;
+$headingLetterSpacing: -0.08em;
+$headingTextShadow: none;
+$backgroundColor: #f7fbfc;
+$linkColor: #3b759e;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: #134674;
+
+// Fix links so they are not cut off
+.reveal a {
+	line-height: 1.3em;
+}
+
+// Background generator
+@mixin bodyBackground() {
+	@include radial-gradient( #add9e4, #f7fbfc );
+}
+
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
diff --git a/static/reveal.js/css/theme/source/solarized.scss b/static/reveal.js/css/theme/source/solarized.scss
new file mode 100644
index 0000000..912be56
--- /dev/null
+++ b/static/reveal.js/css/theme/source/solarized.scss
@@ -0,0 +1,63 @@
+/**
+ * Solarized Light theme for reveal.js.
+ * Author: Achim Staebler
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
+
+
+/**
+ * Solarized colors by Ethan Schoonover
+ */
+html * {
+	color-profile: sRGB;
+	rendering-intent: auto;
+}
+
+// Solarized colors
+$base03:    #002b36;
+$base02:    #073642;
+$base01:    #586e75;
+$base00:    #657b83;
+$base0:     #839496;
+$base1:     #93a1a1;
+$base2:     #eee8d5;
+$base3:     #fdf6e3;
+$yellow:    #b58900;
+$orange:    #cb4b16;
+$red:       #dc322f;
+$magenta:   #d33682;
+$violet:    #6c71c4;
+$blue:      #268bd2;
+$cyan:      #2aa198;
+$green:     #859900;
+
+// Override theme settings (see ../template/settings.scss)
+$mainColor: $base00;
+$headingColor: $base01;
+$headingTextShadow: none;
+$backgroundColor: $base3;
+$linkColor: $blue;
+$linkColorHover: lighten( $linkColor, 20% );
+$selectionBackgroundColor: $magenta;
+
+// Background generator
+// @mixin bodyBackground() {
+// 	@include radial-gradient( rgba($base3,1), rgba(lighten($base3, 20%),1) );
+// }
+
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
diff --git a/static/reveal.js/css/theme/source/white.scss b/static/reveal.js/css/theme/source/white.scss
new file mode 100644
index 0000000..7f06ffd
--- /dev/null
+++ b/static/reveal.js/css/theme/source/white.scss
@@ -0,0 +1,49 @@
+/**
+ * White theme for reveal.js. This is the opposite of the 'black' theme.
+ *
+ * By Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../template/mixins";
+@import "../template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #fff;
+
+$mainColor: #222;
+$headingColor: #222;
+
+$mainFontSize: 42px;
+$mainFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: normal;
+$headingTextTransform: uppercase;
+$headingFontWeight: 600;
+$linkColor: #2a76dd;
+$linkColorHover: lighten( $linkColor, 15% );
+$selectionBackgroundColor: lighten( $linkColor, 25% );
+
+$heading1Size: 2.5em;
+$heading2Size: 1.6em;
+$heading3Size: 1.3em;
+$heading4Size: 1.0em;
+
+section.has-dark-background {
+	&, h1, h2, h3, h4, h5, h6 {
+		color: #fff;
+	}
+}
+
+
+// Theme template ------------------------------
+@import "../template/theme";
+// ---------------------------------------------
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/template/mixins.scss b/static/reveal.js/css/theme/template/mixins.scss
new file mode 100644
index 0000000..e0c5606
--- /dev/null
+++ b/static/reveal.js/css/theme/template/mixins.scss
@@ -0,0 +1,29 @@
+@mixin vertical-gradient( $top, $bottom ) {
+	background: $top;
+	background: -moz-linear-gradient( top, $top 0%, $bottom 100% );
+	background: -webkit-gradient( linear, left top, left bottom, color-stop(0%,$top), color-stop(100%,$bottom) );
+	background: -webkit-linear-gradient( top, $top 0%, $bottom 100% );
+	background: -o-linear-gradient( top, $top 0%, $bottom 100% );
+	background: -ms-linear-gradient( top, $top 0%, $bottom 100% );
+	background: linear-gradient( top, $top 0%, $bottom 100% );
+}
+
+@mixin horizontal-gradient( $top, $bottom ) {
+	background: $top;
+	background: -moz-linear-gradient( left, $top 0%, $bottom 100% );
+	background: -webkit-gradient( linear, left top, right top, color-stop(0%,$top), color-stop(100%,$bottom) );
+	background: -webkit-linear-gradient( left, $top 0%, $bottom 100% );
+	background: -o-linear-gradient( left, $top 0%, $bottom 100% );
+	background: -ms-linear-gradient( left, $top 0%, $bottom 100% );
+	background: linear-gradient( left, $top 0%, $bottom 100% );
+}
+
+@mixin radial-gradient( $outer, $inner, $type: circle ) {
+	background: $outer;
+	background: -moz-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+	background: -webkit-gradient( radial, center center, 0px, center center, 100%, color-stop(0%,$inner), color-stop(100%,$outer) );
+	background: -webkit-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+	background: -o-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+	background: -ms-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+	background: radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
+}
\ No newline at end of file
diff --git a/static/reveal.js/css/theme/template/settings.scss b/static/reveal.js/css/theme/template/settings.scss
new file mode 100644
index 0000000..5a917f8
--- /dev/null
+++ b/static/reveal.js/css/theme/template/settings.scss
@@ -0,0 +1,45 @@
+// Base settings for all themes that can optionally be
+// overridden by the super-theme
+
+// Background of the presentation
+$backgroundColor: #2b2b2b;
+
+// Primary/body text
+$mainFont: 'Lato', sans-serif;
+$mainFontSize: 40px;
+$mainColor: #eee;
+
+// Vertical spacing between blocks of text
+$blockMargin: 20px;
+
+// Headings
+$headingMargin: 0 0 $blockMargin 0;
+$headingFont: 'League Gothic', Impact, sans-serif;
+$headingColor: #eee;
+$headingLineHeight: 1.2;
+$headingLetterSpacing: normal;
+$headingTextTransform: uppercase;
+$headingTextShadow: none;
+$headingFontWeight: normal;
+$heading1TextShadow: $headingTextShadow;
+
+$heading1Size: 3.77em;
+$heading2Size: 2.11em;
+$heading3Size: 1.55em;
+$heading4Size: 1.00em;
+
+$codeFont: monospace;
+
+// Links and actions
+$linkColor: #13DAEC;
+$linkColorHover: lighten( $linkColor, 20% );
+
+// Text selection
+$selectionBackgroundColor: #FF5E99;
+$selectionColor: #fff;
+
+// Generates the presentation background, can be overridden
+// to return a background image or gradient
+@mixin bodyBackground() {
+	background: $backgroundColor;
+}
diff --git a/static/reveal.js/css/theme/template/theme.scss b/static/reveal.js/css/theme/template/theme.scss
new file mode 100644
index 0000000..9ccfaf5
--- /dev/null
+++ b/static/reveal.js/css/theme/template/theme.scss
@@ -0,0 +1,325 @@
+// Base theme template for reveal.js
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+
+body {
+	@include bodyBackground();
+	background-color: $backgroundColor;
+}
+
+.reveal {
+	font-family: $mainFont;
+	font-size: $mainFontSize;
+	font-weight: normal;
+	color: $mainColor;
+}
+
+::selection {
+	color: $selectionColor;
+	background: $selectionBackgroundColor;
+	text-shadow: none;
+}
+
+::-moz-selection {
+	color: $selectionColor;
+	background: $selectionBackgroundColor;
+	text-shadow: none;
+}
+
+.reveal .slides section,
+.reveal .slides section>section {
+	line-height: 1.3;
+	font-weight: inherit;
+}
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+	margin: $headingMargin;
+	color: $headingColor;
+
+	font-family: $headingFont;
+	font-weight: $headingFontWeight;
+	line-height: $headingLineHeight;
+	letter-spacing: $headingLetterSpacing;
+
+	text-transform: $headingTextTransform;
+	text-shadow: $headingTextShadow;
+
+	word-wrap: break-word;
+}
+
+.reveal h1 {font-size: $heading1Size; }
+.reveal h2 {font-size: $heading2Size; }
+.reveal h3 {font-size: $heading3Size; }
+.reveal h4 {font-size: $heading4Size; }
+
+.reveal h1 {
+	text-shadow: $heading1TextShadow;
+}
+
+
+/*********************************************
+ * OTHER
+ *********************************************/
+
+.reveal p {
+	margin: $blockMargin 0;
+	line-height: 1.3;
+}
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+	max-width: 95%;
+	max-height: 95%;
+}
+.reveal strong,
+.reveal b {
+	font-weight: bold;
+}
+
+.reveal em {
+	font-style: italic;
+}
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+	display: inline-block;
+
+	text-align: left;
+	margin: 0 0 0 1em;
+}
+
+.reveal ol {
+	list-style-type: decimal;
+}
+
+.reveal ul {
+	list-style-type: disc;
+}
+
+.reveal ul ul {
+	list-style-type: square;
+}
+
+.reveal ul ul ul {
+	list-style-type: circle;
+}
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+	display: block;
+	margin-left: 40px;
+}
+
+.reveal dt {
+	font-weight: bold;
+}
+
+.reveal dd {
+	margin-left: 40px;
+}
+
+.reveal blockquote {
+	display: block;
+	position: relative;
+	width: 70%;
+	margin: $blockMargin auto;
+	padding: 5px;
+
+	font-style: italic;
+	background: rgba(255, 255, 255, 0.05);
+	box-shadow: 0px 0px 2px rgba(0,0,0,0.2);
+}
+	.reveal blockquote p:first-child,
+	.reveal blockquote p:last-child {
+		display: inline-block;
+	}
+
+.reveal q {
+	font-style: italic;
+}
+
+.reveal pre {
+	display: block;
+	position: relative;
+	width: 90%;
+	margin: $blockMargin auto;
+
+	text-align: left;
+	font-size: 0.55em;
+	font-family: $codeFont;
+	line-height: 1.2em;
+
+	word-wrap: break-word;
+
+	box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15);
+}
+
+.reveal code {
+	font-family: $codeFont;
+	text-transform: none;
+}
+
+.reveal pre code {
+	display: block;
+	padding: 5px;
+	overflow: auto;
+	max-height: 400px;
+	word-wrap: normal;
+}
+
+.reveal table {
+	margin: auto;
+	border-collapse: collapse;
+	border-spacing: 0;
+}
+
+.reveal table th {
+	font-weight: bold;
+}
+
+.reveal table th,
+.reveal table td {
+	text-align: left;
+	padding: 0.2em 0.5em 0.2em 0.5em;
+	border-bottom: 1px solid;
+}
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+	text-align: center;
+}
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+	text-align: right;
+}
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+	border-bottom: none;
+}
+
+.reveal sup {
+	vertical-align: super;
+	font-size: smaller;
+}
+.reveal sub {
+	vertical-align: sub;
+	font-size: smaller;
+}
+
+.reveal small {
+	display: inline-block;
+	font-size: 0.6em;
+	line-height: 1.2em;
+	vertical-align: top;
+}
+
+.reveal small * {
+	vertical-align: top;
+}
+
+
+/*********************************************
+ * LINKS
+ *********************************************/
+
+.reveal a {
+	color: $linkColor;
+	text-decoration: none;
+
+	-webkit-transition: color .15s ease;
+	   -moz-transition: color .15s ease;
+	        transition: color .15s ease;
+}
+	.reveal a:hover {
+		color: $linkColorHover;
+
+		text-shadow: none;
+		border: none;
+	}
+
+.reveal .roll span:after {
+	color: #fff;
+	background: darken( $linkColor, 15% );
+}
+
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+
+.reveal section img {
+	margin: 15px 0px;
+	background: rgba(255,255,255,0.12);
+	border: 4px solid $mainColor;
+
+	box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
+}
+
+	.reveal section img.plain {
+		border: 0;
+		box-shadow: none;
+	}
+
+	.reveal a img {
+		-webkit-transition: all .15s linear;
+		   -moz-transition: all .15s linear;
+		        transition: all .15s linear;
+	}
+
+	.reveal a:hover img {
+		background: rgba(255,255,255,0.2);
+		border-color: $linkColor;
+
+		box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+	}
+
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+
+.reveal .controls {
+	color: $linkColor;
+}
+
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+
+.reveal .progress {
+	background: rgba(0,0,0,0.2);
+	color: $linkColor;
+}
+	.reveal .progress span {
+		-webkit-transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+		   -moz-transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+			transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
+	}
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+ @media print {
+    .backgrounds {
+        background-color: $backgroundColor;
+    }
+}
diff --git a/static/reveal.js/css/theme/white.css b/static/reveal.js/css/theme/white.css
new file mode 100644
index 0000000..43ef2c7
--- /dev/null
+++ b/static/reveal.js/css/theme/white.css
@@ -0,0 +1,273 @@
+/**
+ * White theme for reveal.js. This is the opposite of the 'black' theme.
+ *
+ * By Hakim El Hattab, http://hakim.se
+ */
+@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+section.has-dark-background, section.has-dark-background h1, section.has-dark-background h2, section.has-dark-background h3, section.has-dark-background h4, section.has-dark-background h5, section.has-dark-background h6 {
+  color: #fff; }
+
+/*********************************************
+ * GLOBAL STYLES
+ *********************************************/
+body {
+  background: #fff;
+  background-color: #fff; }
+
+.reveal {
+  font-family: "Source Sans Pro", Helvetica, sans-serif;
+  font-size: 42px;
+  font-weight: normal;
+  color: #222; }
+
+::selection {
+  color: #fff;
+  background: #98bdef;
+  text-shadow: none; }
+
+::-moz-selection {
+  color: #fff;
+  background: #98bdef;
+  text-shadow: none; }
+
+.reveal .slides section,
+.reveal .slides section > section {
+  line-height: 1.3;
+  font-weight: inherit; }
+
+/*********************************************
+ * HEADERS
+ *********************************************/
+.reveal h1,
+.reveal h2,
+.reveal h3,
+.reveal h4,
+.reveal h5,
+.reveal h6 {
+  margin: 0 0 20px 0;
+  color: #222;
+  font-family: "Source Sans Pro", Helvetica, sans-serif;
+  font-weight: 600;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-transform: uppercase;
+  text-shadow: none;
+  word-wrap: break-word; }
+
+.reveal h1 {
+  font-size: 2.5em; }
+
+.reveal h2 {
+  font-size: 1.6em; }
+
+.reveal h3 {
+  font-size: 1.3em; }
+
+.reveal h4 {
+  font-size: 1em; }
+
+.reveal h1 {
+  text-shadow: none; }
+
+/*********************************************
+ * OTHER
+ *********************************************/
+.reveal p {
+  margin: 20px 0;
+  line-height: 1.3; }
+
+/* Ensure certain elements are never larger than the slide itself */
+.reveal img,
+.reveal video,
+.reveal iframe {
+  max-width: 95%;
+  max-height: 95%; }
+
+.reveal strong,
+.reveal b {
+  font-weight: bold; }
+
+.reveal em {
+  font-style: italic; }
+
+.reveal ol,
+.reveal dl,
+.reveal ul {
+  display: inline-block;
+  text-align: left;
+  margin: 0 0 0 1em; }
+
+.reveal ol {
+  list-style-type: decimal; }
+
+.reveal ul {
+  list-style-type: disc; }
+
+.reveal ul ul {
+  list-style-type: square; }
+
+.reveal ul ul ul {
+  list-style-type: circle; }
+
+.reveal ul ul,
+.reveal ul ol,
+.reveal ol ol,
+.reveal ol ul {
+  display: block;
+  margin-left: 40px; }
+
+.reveal dt {
+  font-weight: bold; }
+
+.reveal dd {
+  margin-left: 40px; }
+
+.reveal blockquote {
+  display: block;
+  position: relative;
+  width: 70%;
+  margin: 20px auto;
+  padding: 5px;
+  font-style: italic;
+  background: rgba(255, 255, 255, 0.05);
+  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.2); }
+
+.reveal blockquote p:first-child,
+.reveal blockquote p:last-child {
+  display: inline-block; }
+
+.reveal q {
+  font-style: italic; }
+
+.reveal pre {
+  display: block;
+  position: relative;
+  width: 90%;
+  margin: 20px auto;
+  text-align: left;
+  font-size: 0.55em;
+  font-family: monospace;
+  line-height: 1.2em;
+  word-wrap: break-word;
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.15); }
+
+.reveal code {
+  font-family: monospace;
+  text-transform: none; }
+
+.reveal pre code {
+  display: block;
+  padding: 5px;
+  overflow: auto;
+  max-height: 400px;
+  word-wrap: normal; }
+
+.reveal table {
+  margin: auto;
+  border-collapse: collapse;
+  border-spacing: 0; }
+
+.reveal table th {
+  font-weight: bold; }
+
+.reveal table th,
+.reveal table td {
+  text-align: left;
+  padding: 0.2em 0.5em 0.2em 0.5em;
+  border-bottom: 1px solid; }
+
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+  text-align: center; }
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+  text-align: right; }
+
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+  border-bottom: none; }
+
+.reveal sup {
+  vertical-align: super;
+  font-size: smaller; }
+
+.reveal sub {
+  vertical-align: sub;
+  font-size: smaller; }
+
+.reveal small {
+  display: inline-block;
+  font-size: 0.6em;
+  line-height: 1.2em;
+  vertical-align: top; }
+
+.reveal small * {
+  vertical-align: top; }
+
+/*********************************************
+ * LINKS
+ *********************************************/
+.reveal a {
+  color: #2a76dd;
+  text-decoration: none;
+  -webkit-transition: color .15s ease;
+  -moz-transition: color .15s ease;
+  transition: color .15s ease; }
+
+.reveal a:hover {
+  color: #6ca0e8;
+  text-shadow: none;
+  border: none; }
+
+.reveal .roll span:after {
+  color: #fff;
+  background: #1a53a1; }
+
+/*********************************************
+ * IMAGES
+ *********************************************/
+.reveal section img {
+  margin: 15px 0px;
+  background: rgba(255, 255, 255, 0.12);
+  border: 4px solid #222;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.15); }
+
+.reveal section img.plain {
+  border: 0;
+  box-shadow: none; }
+
+.reveal a img {
+  -webkit-transition: all .15s linear;
+  -moz-transition: all .15s linear;
+  transition: all .15s linear; }
+
+.reveal a:hover img {
+  background: rgba(255, 255, 255, 0.2);
+  border-color: #2a76dd;
+  box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
+
+/*********************************************
+ * NAVIGATION CONTROLS
+ *********************************************/
+.reveal .controls {
+  color: #2a76dd; }
+
+/*********************************************
+ * PROGRESS BAR
+ *********************************************/
+.reveal .progress {
+  background: rgba(0, 0, 0, 0.2);
+  color: #2a76dd; }
+
+.reveal .progress span {
+  -webkit-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  -moz-transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985);
+  transition: width 800ms cubic-bezier(0.26, 0.86, 0.44, 0.985); }
+
+/*********************************************
+ * PRINT BACKGROUND
+ *********************************************/
+@media print {
+  .backgrounds {
+    background-color: #fff; } }
diff --git a/static/reveal.js/js/reveal.js b/static/reveal.js/js/reveal.js
new file mode 100644
index 0000000..a1357a6
--- /dev/null
+++ b/static/reveal.js/js/reveal.js
@@ -0,0 +1,6191 @@
+/*!
+ * reveal.js
+ * http://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+ */
+(function( root, factory ) {
+	if( typeof define === 'function' && define.amd ) {
+		// AMD. Register as an anonymous module.
+		define( function() {
+			root.Reveal = factory();
+			return root.Reveal;
+		} );
+	} else if( typeof exports === 'object' ) {
+		// Node. Does not work with strict CommonJS.
+		module.exports = factory();
+	} else {
+		// Browser globals.
+		root.Reveal = factory();
+	}
+}( this, function() {
+
+	'use strict';
+
+	var Reveal;
+
+	// The reveal.js version
+	var VERSION = '3.9.2';
+
+	var SLIDES_SELECTOR = '.slides section',
+		HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
+		VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
+		HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
+
+		UA = navigator.userAgent,
+
+		// Methods that may not be invoked via the postMessage API
+		POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener/,
+
+		// Configuration defaults, can be overridden at initialization time
+		config = {
+
+			// The "normal" size of the presentation, aspect ratio will be preserved
+			// when the presentation is scaled to fit different resolutions
+			width: 960,
+			height: 700,
+
+			// Factor of the display size that should remain empty around the content
+			margin: 0.04,
+
+			// Bounds for smallest/largest possible scale to apply to content
+			minScale: 0.2,
+			maxScale: 2.0,
+
+			// Display presentation control arrows
+			controls: true,
+
+			// Help the user learn the controls by providing hints, for example by
+			// bouncing the down arrow when they first encounter a vertical slide
+			controlsTutorial: true,
+
+			// Determines where controls appear, "edges" or "bottom-right"
+			controlsLayout: 'bottom-right',
+
+			// Visibility rule for backwards navigation arrows; "faded", "hidden"
+			// or "visible"
+			controlsBackArrows: 'faded',
+
+			// Display a presentation progress bar
+			progress: true,
+
+			// Display the page number of the current slide
+			// - true:    Show slide number
+			// - false:   Hide slide number
+			//
+			// Can optionally be set as a string that specifies the number formatting:
+			// - "h.v":	  Horizontal . vertical slide number (default)
+			// - "h/v":	  Horizontal / vertical slide number
+			// - "c":	  Flattened slide number
+			// - "c/t":	  Flattened slide number / total slides
+			//
+			// Alternatively, you can provide a function that returns the slide
+			// number for the current slide. The function should take in a slide
+			// object and return an array with one string [slideNumber] or
+			// three strings [n1,delimiter,n2]. See #formatSlideNumber().
+			slideNumber: false,
+
+			// Can be used to limit the contexts in which the slide number appears
+			// - "all":      Always show the slide number
+			// - "print":    Only when printing to PDF
+			// - "speaker":  Only in the speaker view
+			showSlideNumber: 'all',
+
+			// Use 1 based indexing for # links to match slide number (default is zero
+			// based)
+			hashOneBasedIndex: false,
+
+			// Add the current slide number to the URL hash so that reloading the
+			// page/copying the URL will return you to the same slide
+			hash: false,
+
+			// Push each slide change to the browser history.  Implies `hash: true`
+			history: false,
+
+			// Enable keyboard shortcuts for navigation
+			keyboard: true,
+
+			// Optional function that blocks keyboard events when retuning false
+			keyboardCondition: null,
+
+			// Enable the slide overview mode
+			overview: true,
+
+			// Disables the default reveal.js slide layout so that you can use
+			// custom CSS layout
+			disableLayout: false,
+
+			// Vertical centering of slides
+			center: true,
+
+			// Enables touch navigation on devices with touch input
+			touch: true,
+
+			// Loop the presentation
+			loop: false,
+
+			// Change the presentation direction to be RTL
+			rtl: false,
+
+			// Changes the behavior of our navigation directions.
+			//
+			// "default"
+			// Left/right arrow keys step between horizontal slides, up/down
+			// arrow keys step between vertical slides. Space key steps through
+			// all slides (both horizontal and vertical).
+			//
+			// "linear"
+			// Removes the up/down arrows. Left/right arrows step through all
+			// slides (both horizontal and vertical).
+			//
+			// "grid"
+			// When this is enabled, stepping left/right from a vertical stack
+			// to an adjacent vertical stack will land you at the same vertical
+			// index.
+			//
+			// Consider a deck with six slides ordered in two vertical stacks:
+			// 1.1    2.1
+			// 1.2    2.2
+			// 1.3    2.3
+			//
+			// If you're on slide 1.3 and navigate right, you will normally move
+			// from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
+			// from 1.3 -> 2.3.
+			navigationMode: 'default',
+
+			// Randomizes the order of slides each time the presentation loads
+			shuffle: false,
+
+			// Turns fragments on and off globally
+			fragments: true,
+
+			// Flags whether to include the current fragment in the URL,
+			// so that reloading brings you to the same fragment position
+			fragmentInURL: false,
+
+			// Flags if the presentation is running in an embedded mode,
+			// i.e. contained within a limited portion of the screen
+			embedded: false,
+
+			// Flags if we should show a help overlay when the question-mark
+			// key is pressed
+			help: true,
+
+			// Flags if it should be possible to pause the presentation (blackout)
+			pause: true,
+
+			// Flags if speaker notes should be visible to all viewers
+			showNotes: false,
+
+			// Global override for autolaying embedded media (video/audio/iframe)
+			// - null:   Media will only autoplay if data-autoplay is present
+			// - true:   All media will autoplay, regardless of individual setting
+			// - false:  No media will autoplay, regardless of individual setting
+			autoPlayMedia: null,
+
+			// Global override for preloading lazy-loaded iframes
+			// - null:   Iframes with data-src AND data-preload will be loaded when within
+			//           the viewDistance, iframes with only data-src will be loaded when visible
+			// - true:   All iframes with data-src will be loaded when within the viewDistance
+			// - false:  All iframes with data-src will be loaded only when visible
+			preloadIframes: null,
+
+			// Controls automatic progression to the next slide
+			// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute
+			//           is present on the current slide or fragment
+			// - 1+:     All slides will progress automatically at the given interval
+			// - false:  No auto-sliding, even if data-autoslide is present
+			autoSlide: 0,
+
+			// Stop auto-sliding after user input
+			autoSlideStoppable: true,
+
+			// Use this method for navigation when auto-sliding (defaults to navigateNext)
+			autoSlideMethod: null,
+
+			// Specify the average time in seconds that you think you will spend
+			// presenting each slide. This is used to show a pacing timer in the
+			// speaker view
+			defaultTiming: null,
+
+			// Enable slide navigation via mouse wheel
+			mouseWheel: false,
+
+			// Apply a 3D roll to links on hover
+			rollingLinks: false,
+
+			// Hides the address bar on mobile devices
+			hideAddressBar: true,
+
+			// Opens links in an iframe preview overlay
+			// Add `data-preview-link` and `data-preview-link="false"` to customise each link
+			// individually
+			previewLinks: false,
+
+			// Exposes the reveal.js API through window.postMessage
+			postMessage: true,
+
+			// Dispatches all reveal.js events to the parent window through postMessage
+			postMessageEvents: false,
+
+			// Focuses body when page changes visibility to ensure keyboard shortcuts work
+			focusBodyOnPageVisibilityChange: true,
+
+			// Transition style
+			transition: 'slide', // none/fade/slide/convex/concave/zoom
+
+			// Transition speed
+			transitionSpeed: 'default', // default/fast/slow
+
+			// Transition style for full page slide backgrounds
+			backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
+
+			// Parallax background image
+			parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
+
+			// Parallax background size
+			parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
+
+			// Parallax background repeat
+			parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
+
+			// Parallax background position
+			parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
+
+			// Amount of pixels to move the parallax background per slide step
+			parallaxBackgroundHorizontal: null,
+			parallaxBackgroundVertical: null,
+
+			// The maximum number of pages a single slide can expand onto when printing
+			// to PDF, unlimited by default
+			pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
+
+			// Prints each fragment on a separate slide
+			pdfSeparateFragments: true,
+
+			// Offset used to reduce the height of content within exported PDF pages.
+			// This exists to account for environment differences based on how you
+			// print to PDF. CLI printing options, like phantomjs and wkpdf, can end
+			// on precisely the total height of the document whereas in-browser
+			// printing has to end one pixel before.
+			pdfPageHeightOffset: -1,
+
+			// Number of slides away from the current that are visible
+			viewDistance: 3,
+
+			// Number of slides away from the current that are visible on mobile
+			// devices. It is advisable to set this to a lower number than
+			// viewDistance in order to save resources.
+			mobileViewDistance: 2,
+
+			// The display mode that will be used to show slides
+			display: 'block',
+
+			// Hide cursor if inactive
+			hideInactiveCursor: true,
+
+			// Time before the cursor is hidden (in ms)
+			hideCursorTime: 5000,
+
+			// Script dependencies to load
+			dependencies: []
+
+		},
+
+		// Flags if Reveal.initialize() has been called
+		initialized = false,
+
+		// Flags if reveal.js is loaded (has dispatched the 'ready' event)
+		loaded = false,
+
+		// Flags if the overview mode is currently active
+		overview = false,
+
+		// Holds the dimensions of our overview slides, including margins
+		overviewSlideWidth = null,
+		overviewSlideHeight = null,
+
+		// The horizontal and vertical index of the currently active slide
+		indexh,
+		indexv,
+
+		// The previous and current slide HTML elements
+		previousSlide,
+		currentSlide,
+
+		previousBackground,
+
+		// Remember which directions that the user has navigated towards
+		hasNavigatedRight = false,
+		hasNavigatedDown = false,
+
+		// Slides may hold a data-state attribute which we pick up and apply
+		// as a class to the body. This list contains the combined state of
+		// all current slides.
+		state = [],
+
+		// The current scale of the presentation (see width/height config)
+		scale = 1,
+
+		// CSS transform that is currently applied to the slides container,
+		// split into two groups
+		slidesTransform = { layout: '', overview: '' },
+
+		// Cached references to DOM elements
+		dom = {},
+
+		// A list of registered reveal.js plugins
+		plugins = {},
+
+		// List of asynchronously loaded reveal.js dependencies
+		asyncDependencies = [],
+
+		// Features supported by the browser, see #checkCapabilities()
+		features = {},
+
+		// Client is a mobile device, see #checkCapabilities()
+		isMobileDevice,
+
+		// Client is a desktop Chrome, see #checkCapabilities()
+		isChrome,
+
+		// Throttles mouse wheel navigation
+		lastMouseWheelStep = 0,
+
+		// Delays updates to the URL due to a Chrome thumbnailer bug
+		writeURLTimeout = 0,
+
+		// Is the mouse pointer currently hidden from view
+		cursorHidden = false,
+
+		// Timeout used to determine when the cursor is inactive
+		cursorInactiveTimeout = 0,
+
+		// Flags if the interaction event listeners are bound
+		eventsAreBound = false,
+
+		// The current auto-slide duration
+		autoSlide = 0,
+
+		// Auto slide properties
+		autoSlidePlayer,
+		autoSlideTimeout = 0,
+		autoSlideStartTime = -1,
+		autoSlidePaused = false,
+
+		// Holds information about the currently ongoing touch input
+		touch = {
+			startX: 0,
+			startY: 0,
+			startCount: 0,
+			captured: false,
+			threshold: 40
+		},
+
+		// A key:value map of shortcut keyboard keys and descriptions of
+		// the actions they trigger, generated in #configure()
+		keyboardShortcuts = {},
+
+		// Holds custom key code mappings
+		registeredKeyBindings = {};
+
+	/**
+	 * Starts up the presentation if the client is capable.
+	 */
+	function initialize( options ) {
+
+		// Make sure we only initialize once
+		if( initialized === true ) return;
+
+		initialized = true;
+
+		checkCapabilities();
+
+		if( !features.transforms2d && !features.transforms3d ) {
+			document.body.setAttribute( 'class', 'no-transforms' );
+
+			// Since JS won't be running any further, we load all lazy
+			// loading elements upfront
+			var images = toArray( document.getElementsByTagName( 'img' ) ),
+				iframes = toArray( document.getElementsByTagName( 'iframe' ) );
+
+			var lazyLoadable = images.concat( iframes );
+
+			for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
+				var element = lazyLoadable[i];
+				if( element.getAttribute( 'data-src' ) ) {
+					element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+					element.removeAttribute( 'data-src' );
+				}
+			}
+
+			// If the browser doesn't support core features we won't be
+			// using JavaScript to control the presentation
+			return;
+		}
+
+		// Cache references to key DOM elements
+		dom.wrapper = document.querySelector( '.reveal' );
+		dom.slides = document.querySelector( '.reveal .slides' );
+
+		// Force a layout when the whole page, incl fonts, has loaded
+		window.addEventListener( 'load', layout, false );
+
+		var query = Reveal.getQueryHash();
+
+		// Do not accept new dependencies via query config to avoid
+		// the potential of malicious script injection
+		if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
+
+		// Copy options over to our config object
+		extend( config, options );
+		extend( config, query );
+
+		// Hide the address bar in mobile browsers
+		hideAddressBar();
+
+		// Loads dependencies and continues to #start() once done
+		load();
+
+	}
+
+	/**
+	 * Inspect the client to see what it's capable of, this
+	 * should only happens once per runtime.
+	 */
+	function checkCapabilities() {
+
+		isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
+							( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
+		isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
+
+		var testElement = document.createElement( 'div' );
+
+		features.transforms3d = 'WebkitPerspective' in testElement.style ||
+								'MozPerspective' in testElement.style ||
+								'msPerspective' in testElement.style ||
+								'OPerspective' in testElement.style ||
+								'perspective' in testElement.style;
+
+		features.transforms2d = 'WebkitTransform' in testElement.style ||
+								'MozTransform' in testElement.style ||
+								'msTransform' in testElement.style ||
+								'OTransform' in testElement.style ||
+								'transform' in testElement.style;
+
+		features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
+		features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
+
+		features.canvas = !!document.createElement( 'canvas' ).getContext;
+
+		// Transitions in the overview are disabled in desktop and
+		// Safari due to lag
+		features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
+
+		// Flags if we should use zoom instead of transform to scale
+		// up slides. Zoom produces crisper results but has a lot of
+		// xbrowser quirks so we only use it in whitelsited browsers.
+		features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
+						( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
+
+	}
+
+	/**
+	 * Loads the dependencies of reveal.js. Dependencies are
+	 * defined via the configuration option 'dependencies'
+	 * and will be loaded prior to starting/binding reveal.js.
+	 * Some dependencies may have an 'async' flag, if so they
+	 * will load after reveal.js has been started up.
+	 */
+	function load() {
+
+		var scripts = [],
+			scriptsToLoad = 0;
+
+		config.dependencies.forEach( function( s ) {
+			// Load if there's no condition or the condition is truthy
+			if( !s.condition || s.condition() ) {
+				if( s.async ) {
+					asyncDependencies.push( s );
+				}
+				else {
+					scripts.push( s );
+				}
+			}
+		} );
+
+		if( scripts.length ) {
+			scriptsToLoad = scripts.length;
+
+			// Load synchronous scripts
+			scripts.forEach( function( s ) {
+				loadScript( s.src, function() {
+
+					if( typeof s.callback === 'function' ) s.callback();
+
+					if( --scriptsToLoad === 0 ) {
+						initPlugins();
+					}
+
+				} );
+			} );
+		}
+		else {
+			initPlugins();
+		}
+
+	}
+
+	/**
+	 * Initializes our plugins and waits for them to be ready
+	 * before proceeding.
+	 */
+	function initPlugins() {
+
+		var pluginsToInitialize = Object.keys( plugins ).length;
+
+		// If there are no plugins, skip this step
+		if( pluginsToInitialize === 0 ) {
+			loadAsyncDependencies();
+		}
+		// ... otherwise initialize plugins
+		else {
+
+			var afterPlugInitialized = function() {
+				if( --pluginsToInitialize === 0 ) {
+					loadAsyncDependencies();
+				}
+			};
+
+			for( var i in plugins ) {
+
+				var plugin = plugins[i];
+
+				// If the plugin has an 'init' method, invoke it
+				if( typeof plugin.init === 'function' ) {
+					var callback = plugin.init();
+
+					// If the plugin returned a Promise, wait for it
+					if( callback && typeof callback.then === 'function' ) {
+						callback.then( afterPlugInitialized );
+					}
+					else {
+						afterPlugInitialized();
+					}
+				}
+				else {
+					afterPlugInitialized();
+				}
+
+			}
+
+		}
+
+	}
+
+	/**
+	 * Loads all async reveal.js dependencies.
+	 */
+	function loadAsyncDependencies() {
+
+		if( asyncDependencies.length ) {
+			asyncDependencies.forEach( function( s ) {
+				loadScript( s.src, s.callback );
+			} );
+		}
+
+		start();
+
+	}
+
+	/**
+	 * Loads a JavaScript file from the given URL and executes it.
+	 *
+	 * @param {string} url Address of the .js file to load
+	 * @param {function} callback Method to invoke when the script
+	 * has loaded and executed
+	 */
+	function loadScript( url, callback ) {
+
+		var script = document.createElement( 'script' );
+		script.type = 'text/javascript';
+		script.async = false;
+		script.defer = false;
+		script.src = url;
+
+		if( callback ) {
+
+			// Success callback
+			script.onload = script.onreadystatechange = function( event ) {
+				if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
+
+					// Kill event listeners
+					script.onload = script.onreadystatechange = script.onerror = null;
+
+					callback();
+
+				}
+			};
+
+			// Error callback
+			script.onerror = function( err ) {
+
+				// Kill event listeners
+				script.onload = script.onreadystatechange = script.onerror = null;
+
+				callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
+
+			};
+
+		}
+
+		// Append the script at the end of <head>
+		var head = document.querySelector( 'head' );
+		head.insertBefore( script, head.lastChild );
+
+	}
+
+	/**
+	 * Starts up reveal.js by binding input events and navigating
+	 * to the current URL deeplink if there is one.
+	 */
+	function start() {
+
+		loaded = true;
+
+		// Make sure we've got all the DOM elements we need
+		setupDOM();
+
+		// Listen to messages posted to this window
+		setupPostMessage();
+
+		// Prevent the slides from being scrolled out of view
+		setupScrollPrevention();
+
+		// Resets all vertical slides so that only the first is visible
+		resetVerticalSlides();
+
+		// Updates the presentation to match the current configuration values
+		configure();
+
+		// Read the initial hash
+		readURL();
+
+		// Update all backgrounds
+		updateBackground( true );
+
+		// Notify listeners that the presentation is ready but use a 1ms
+		// timeout to ensure it's not fired synchronously after #initialize()
+		setTimeout( function() {
+			// Enable transitions now that we're loaded
+			dom.slides.classList.remove( 'no-transition' );
+
+			dom.wrapper.classList.add( 'ready' );
+
+			dispatchEvent( 'ready', {
+				'indexh': indexh,
+				'indexv': indexv,
+				'currentSlide': currentSlide
+			} );
+		}, 1 );
+
+		// Special setup and config is required when printing to PDF
+		if( isPrintingPDF() ) {
+			removeEventListeners();
+
+			// The document needs to have loaded for the PDF layout
+			// measurements to be accurate
+			if( document.readyState === 'complete' ) {
+				setupPDF();
+			}
+			else {
+				window.addEventListener( 'load', setupPDF );
+			}
+		}
+
+	}
+
+	/**
+	 * Finds and stores references to DOM elements which are
+	 * required by the presentation. If a required element is
+	 * not found, it is created.
+	 */
+	function setupDOM() {
+
+		// Prevent transitions while we're loading
+		dom.slides.classList.add( 'no-transition' );
+
+		if( isMobileDevice ) {
+			dom.wrapper.classList.add( 'no-hover' );
+		}
+		else {
+			dom.wrapper.classList.remove( 'no-hover' );
+		}
+
+		if( /iphone/gi.test( UA ) ) {
+			dom.wrapper.classList.add( 'ua-iphone' );
+		}
+		else {
+			dom.wrapper.classList.remove( 'ua-iphone' );
+		}
+
+		// Background element
+		dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
+
+		// Progress bar
+		dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
+		dom.progressbar = dom.progress.querySelector( 'span' );
+
+		// Arrow controls
+		dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
+			'<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
+			'<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
+			'<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
+			'<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
+
+		// Slide number
+		dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
+
+		// Element containing notes that are visible to the audience
+		dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
+		dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
+		dom.speakerNotes.setAttribute( 'tabindex', '0' );
+
+		// Overlay graphic which is displayed during the paused mode
+		dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
+
+		dom.wrapper.setAttribute( 'role', 'application' );
+
+		// There can be multiple instances of controls throughout the page
+		dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
+		dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
+		dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
+		dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
+		dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
+		dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
+
+		// The right and down arrows in the standard reveal.js controls
+		dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
+		dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
+
+		dom.statusDiv = createStatusDiv();
+	}
+
+	/**
+	 * Creates a hidden div with role aria-live to announce the
+	 * current slide content. Hide the div off-screen to make it
+	 * available only to Assistive Technologies.
+	 *
+	 * @return {HTMLElement}
+	 */
+	function createStatusDiv() {
+
+		var statusDiv = document.getElementById( 'aria-status-div' );
+		if( !statusDiv ) {
+			statusDiv = document.createElement( 'div' );
+			statusDiv.style.position = 'absolute';
+			statusDiv.style.height = '1px';
+			statusDiv.style.width = '1px';
+			statusDiv.style.overflow = 'hidden';
+			statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
+			statusDiv.setAttribute( 'id', 'aria-status-div' );
+			statusDiv.setAttribute( 'aria-live', 'polite' );
+			statusDiv.setAttribute( 'aria-atomic','true' );
+			dom.wrapper.appendChild( statusDiv );
+		}
+		return statusDiv;
+
+	}
+
+	/**
+	 * Converts the given HTML element into a string of text
+	 * that can be announced to a screen reader. Hidden
+	 * elements are excluded.
+	 */
+	function getStatusText( node ) {
+
+		var text = '';
+
+		// Text node
+		if( node.nodeType === 3 ) {
+			text += node.textContent;
+		}
+		// Element node
+		else if( node.nodeType === 1 ) {
+
+			var isAriaHidden = node.getAttribute( 'aria-hidden' );
+			var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
+			if( isAriaHidden !== 'true' && !isDisplayHidden ) {
+
+				toArray( node.childNodes ).forEach( function( child ) {
+					text += getStatusText( child );
+				} );
+
+			}
+
+		}
+
+		return text;
+
+	}
+
+	/**
+	 * Configures the presentation for printing to a static
+	 * PDF.
+	 */
+	function setupPDF() {
+
+		var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
+
+		// Dimensions of the PDF pages
+		var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+			pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
+
+		// Dimensions of slides within the pages
+		var slideWidth = slideSize.width,
+			slideHeight = slideSize.height;
+
+		// Let the browser know what page size we want to print
+		injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
+
+		// Limit the size of certain elements to the dimensions of the slide
+		injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
+
+		document.body.classList.add( 'print-pdf' );
+		document.body.style.width = pageWidth + 'px';
+		document.body.style.height = pageHeight + 'px';
+
+		// Make sure stretch elements fit on slide
+		layoutSlideContents( slideWidth, slideHeight );
+
+		// Compute slide numbers now, before we start duplicating slides
+		var doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+		toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+			slide.setAttribute( 'data-slide-number', getSlideNumber( slide ) );
+		} );
+
+		// Slide and slide background layout
+		toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+
+			// Vertical stacks are not centred since their section
+			// children will be
+			if( slide.classList.contains( 'stack' ) === false ) {
+				// Center the slide inside of the page, giving the slide some margin
+				var left = ( pageWidth - slideWidth ) / 2,
+					top = ( pageHeight - slideHeight ) / 2;
+
+				var contentHeight = slide.scrollHeight;
+				var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
+
+				// Adhere to configured pages per slide limit
+				numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
+
+				// Center slides vertically
+				if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
+					top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
+				}
+
+				// Wrap the slide in a page element and hide its overflow
+				// so that no page ever flows onto another
+				var page = document.createElement( 'div' );
+				page.className = 'pdf-page';
+				page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
+				slide.parentNode.insertBefore( page, slide );
+				page.appendChild( slide );
+
+				// Position the slide inside of the page
+				slide.style.left = left + 'px';
+				slide.style.top = top + 'px';
+				slide.style.width = slideWidth + 'px';
+
+				if( slide.slideBackgroundElement ) {
+					page.insertBefore( slide.slideBackgroundElement, slide );
+				}
+
+				// Inject notes if `showNotes` is enabled
+				if( config.showNotes ) {
+
+					// Are there notes for this slide?
+					var notes = getSlideNotes( slide );
+					if( notes ) {
+
+						var notesSpacing = 8;
+						var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+						var notesElement = document.createElement( 'div' );
+						notesElement.classList.add( 'speaker-notes' );
+						notesElement.classList.add( 'speaker-notes-pdf' );
+						notesElement.setAttribute( 'data-layout', notesLayout );
+						notesElement.innerHTML = notes;
+
+						if( notesLayout === 'separate-page' ) {
+							page.parentNode.insertBefore( notesElement, page.nextSibling );
+						}
+						else {
+							notesElement.style.left = notesSpacing + 'px';
+							notesElement.style.bottom = notesSpacing + 'px';
+							notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
+							page.appendChild( notesElement );
+						}
+
+					}
+
+				}
+
+				// Inject slide numbers if `slideNumbers` are enabled
+				if( doingSlideNumbers ) {
+					var numberElement = document.createElement( 'div' );
+					numberElement.classList.add( 'slide-number' );
+					numberElement.classList.add( 'slide-number-pdf' );
+					numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
+					page.appendChild( numberElement );
+				}
+
+				// Copy page and show fragments one after another
+				if( config.pdfSeparateFragments ) {
+
+					// Each fragment 'group' is an array containing one or more
+					// fragments. Multiple fragments that appear at the same time
+					// are part of the same group.
+					var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
+
+					var previousFragmentStep;
+					var previousPage;
+
+					fragmentGroups.forEach( function( fragments ) {
+
+						// Remove 'current-fragment' from the previous group
+						if( previousFragmentStep ) {
+							previousFragmentStep.forEach( function( fragment ) {
+								fragment.classList.remove( 'current-fragment' );
+							} );
+						}
+
+						// Show the fragments for the current index
+						fragments.forEach( function( fragment ) {
+							fragment.classList.add( 'visible', 'current-fragment' );
+						} );
+
+						// Create a separate page for the current fragment state
+						var clonedPage = page.cloneNode( true );
+						page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
+
+						previousFragmentStep = fragments;
+						previousPage = clonedPage;
+
+					} );
+
+					// Reset the first/original page so that all fragments are hidden
+					fragmentGroups.forEach( function( fragments ) {
+						fragments.forEach( function( fragment ) {
+							fragment.classList.remove( 'visible', 'current-fragment' );
+						} );
+					} );
+
+				}
+				// Show all fragments
+				else {
+					toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
+						fragment.classList.add( 'visible' );
+					} );
+				}
+
+			}
+
+		} );
+
+		// Notify subscribers that the PDF layout is good to go
+		dispatchEvent( 'pdf-ready' );
+
+	}
+
+	/**
+	 * This is an unfortunate necessity. Some actions – such as
+	 * an input field being focused in an iframe or using the
+	 * keyboard to expand text selection beyond the bounds of
+	 * a slide – can trigger our content to be pushed out of view.
+	 * This scrolling can not be prevented by hiding overflow in
+	 * CSS (we already do) so we have to resort to repeatedly
+	 * checking if the slides have been offset :(
+	 */
+	function setupScrollPrevention() {
+
+		setInterval( function() {
+			if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
+				dom.wrapper.scrollTop = 0;
+				dom.wrapper.scrollLeft = 0;
+			}
+		}, 1000 );
+
+	}
+
+	/**
+	 * Creates an HTML element and returns a reference to it.
+	 * If the element already exists the existing instance will
+	 * be returned.
+	 *
+	 * @param {HTMLElement} container
+	 * @param {string} tagname
+	 * @param {string} classname
+	 * @param {string} innerHTML
+	 *
+	 * @return {HTMLElement}
+	 */
+	function createSingletonNode( container, tagname, classname, innerHTML ) {
+
+		// Find all nodes matching the description
+		var nodes = container.querySelectorAll( '.' + classname );
+
+		// Check all matches to find one which is a direct child of
+		// the specified container
+		for( var i = 0; i < nodes.length; i++ ) {
+			var testNode = nodes[i];
+			if( testNode.parentNode === container ) {
+				return testNode;
+			}
+		}
+
+		// If no node was found, create it now
+		var node = document.createElement( tagname );
+		node.className = classname;
+		if( typeof innerHTML === 'string' ) {
+			node.innerHTML = innerHTML;
+		}
+		container.appendChild( node );
+
+		return node;
+
+	}
+
+	/**
+	 * Creates the slide background elements and appends them
+	 * to the background container. One element is created per
+	 * slide no matter if the given slide has visible background.
+	 */
+	function createBackgrounds() {
+
+		var printMode = isPrintingPDF();
+
+		// Clear prior backgrounds
+		dom.background.innerHTML = '';
+		dom.background.classList.add( 'no-transition' );
+
+		// Iterate over all horizontal slides
+		toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
+
+			var backgroundStack = createBackground( slideh, dom.background );
+
+			// Iterate over all vertical slides
+			toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
+
+				createBackground( slidev, backgroundStack );
+
+				backgroundStack.classList.add( 'stack' );
+
+			} );
+
+		} );
+
+		// Add parallax background if specified
+		if( config.parallaxBackgroundImage ) {
+
+			dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
+			dom.background.style.backgroundSize = config.parallaxBackgroundSize;
+			dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
+			dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
+
+			// Make sure the below properties are set on the element - these properties are
+			// needed for proper transitions to be set on the element via CSS. To remove
+			// annoying background slide-in effect when the presentation starts, apply
+			// these properties after short time delay
+			setTimeout( function() {
+				dom.wrapper.classList.add( 'has-parallax-background' );
+			}, 1 );
+
+		}
+		else {
+
+			dom.background.style.backgroundImage = '';
+			dom.wrapper.classList.remove( 'has-parallax-background' );
+
+		}
+
+	}
+
+	/**
+	 * Creates a background for the given slide.
+	 *
+	 * @param {HTMLElement} slide
+	 * @param {HTMLElement} container The element that the background
+	 * should be appended to
+	 * @return {HTMLElement} New background div
+	 */
+	function createBackground( slide, container ) {
+
+
+		// Main slide background element
+		var element = document.createElement( 'div' );
+		element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
+
+		// Inner background element that wraps images/videos/iframes
+		var contentElement = document.createElement( 'div' );
+		contentElement.className = 'slide-background-content';
+
+		element.appendChild( contentElement );
+		container.appendChild( element );
+
+		slide.slideBackgroundElement = element;
+		slide.slideBackgroundContentElement = contentElement;
+
+		// Syncs the background to reflect all current background settings
+		syncBackground( slide );
+
+		return element;
+
+	}
+
+	/**
+	 * Renders all of the visual properties of a slide background
+	 * based on the various background attributes.
+	 *
+	 * @param {HTMLElement} slide
+	 */
+	function syncBackground( slide ) {
+
+		var element = slide.slideBackgroundElement,
+			contentElement = slide.slideBackgroundContentElement;
+
+		// Reset the prior background state in case this is not the
+		// initial sync
+		slide.classList.remove( 'has-dark-background' );
+		slide.classList.remove( 'has-light-background' );
+
+		element.removeAttribute( 'data-loaded' );
+		element.removeAttribute( 'data-background-hash' );
+		element.removeAttribute( 'data-background-size' );
+		element.removeAttribute( 'data-background-transition' );
+		element.style.backgroundColor = '';
+
+		contentElement.style.backgroundSize = '';
+		contentElement.style.backgroundRepeat = '';
+		contentElement.style.backgroundPosition = '';
+		contentElement.style.backgroundImage = '';
+		contentElement.style.opacity = '';
+		contentElement.innerHTML = '';
+
+		var data = {
+			background: slide.getAttribute( 'data-background' ),
+			backgroundSize: slide.getAttribute( 'data-background-size' ),
+			backgroundImage: slide.getAttribute( 'data-background-image' ),
+			backgroundVideo: slide.getAttribute( 'data-background-video' ),
+			backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
+			backgroundColor: slide.getAttribute( 'data-background-color' ),
+			backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
+			backgroundPosition: slide.getAttribute( 'data-background-position' ),
+			backgroundTransition: slide.getAttribute( 'data-background-transition' ),
+			backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
+		};
+
+		if( data.background ) {
+			// Auto-wrap image urls in url(...)
+			if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
+				slide.setAttribute( 'data-background-image', data.background );
+			}
+			else {
+				element.style.background = data.background;
+			}
+		}
+
+		// Create a hash for this combination of background settings.
+		// This is used to determine when two slide backgrounds are
+		// the same.
+		if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
+			element.setAttribute( 'data-background-hash', data.background +
+															data.backgroundSize +
+															data.backgroundImage +
+															data.backgroundVideo +
+															data.backgroundIframe +
+															data.backgroundColor +
+															data.backgroundRepeat +
+															data.backgroundPosition +
+															data.backgroundTransition +
+															data.backgroundOpacity );
+		}
+
+		// Additional and optional background properties
+		if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
+		if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
+		if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
+
+		if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
+
+		// Background image options are set on the content wrapper
+		if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
+		if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
+		if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
+		if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
+
+		// If this slide has a background color, we add a class that
+		// signals if it is light or dark. If the slide has no background
+		// color, no class will be added
+		var contrastColor = data.backgroundColor;
+
+		// If no bg color was found, check the computed background
+		if( !contrastColor ) {
+			var computedBackgroundStyle = window.getComputedStyle( element );
+			if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
+				contrastColor = computedBackgroundStyle.backgroundColor;
+			}
+		}
+
+		if( contrastColor ) {
+			var rgb = colorToRgb( contrastColor );
+
+			// Ignore fully transparent backgrounds. Some browsers return
+			// rgba(0,0,0,0) when reading the computed background color of
+			// an element with no background
+			if( rgb && rgb.a !== 0 ) {
+				if( colorBrightness( contrastColor ) < 128 ) {
+					slide.classList.add( 'has-dark-background' );
+				}
+				else {
+					slide.classList.add( 'has-light-background' );
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * Registers a listener to postMessage events, this makes it
+	 * possible to call all reveal.js API methods from another
+	 * window. For example:
+	 *
+	 * revealWindow.postMessage( JSON.stringify({
+	 *   method: 'slide',
+	 *   args: [ 2 ]
+	 * }), '*' );
+	 */
+	function setupPostMessage() {
+
+		if( config.postMessage ) {
+			window.addEventListener( 'message', function ( event ) {
+				var data = event.data;
+
+				// Make sure we're dealing with JSON
+				if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
+					data = JSON.parse( data );
+
+					// Check if the requested method can be found
+					if( data.method && typeof Reveal[data.method] === 'function' ) {
+
+						if( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {
+
+							var result = Reveal[data.method].apply( Reveal, data.args );
+
+							// Dispatch a postMessage event with the returned value from
+							// our method invocation for getter functions
+							dispatchPostMessage( 'callback', { method: data.method, result: result } );
+
+						}
+						else {
+							console.warn( 'reveal.js: "'+ data.method +'" is is blacklisted from the postMessage API' );
+						}
+
+					}
+				}
+			}, false );
+		}
+
+	}
+
+	/**
+	 * Applies the configuration settings from the config
+	 * object. May be called multiple times.
+	 *
+	 * @param {object} options
+	 */
+	function configure( options ) {
+
+		var oldTransition = config.transition;
+
+		// New config options may be passed when this method
+		// is invoked through the API after initialization
+		if( typeof options === 'object' ) extend( config, options );
+
+		// Abort if reveal.js hasn't finished loading, config
+		// changes will be applied automatically once loading
+		// finishes
+		if( loaded === false ) return;
+
+		var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
+
+		// Remove the previously configured transition class
+		dom.wrapper.classList.remove( oldTransition );
+
+		// Force linear transition based on browser capabilities
+		if( features.transforms3d === false ) config.transition = 'linear';
+
+		dom.wrapper.classList.add( config.transition );
+
+		dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
+		dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
+
+		dom.controls.style.display = config.controls ? 'block' : 'none';
+		dom.progress.style.display = config.progress ? 'block' : 'none';
+
+		dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
+		dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
+
+		if( config.shuffle ) {
+			shuffle();
+		}
+
+		if( config.rtl ) {
+			dom.wrapper.classList.add( 'rtl' );
+		}
+		else {
+			dom.wrapper.classList.remove( 'rtl' );
+		}
+
+		if( config.center ) {
+			dom.wrapper.classList.add( 'center' );
+		}
+		else {
+			dom.wrapper.classList.remove( 'center' );
+		}
+
+		// Exit the paused mode if it was configured off
+		if( config.pause === false ) {
+			resume();
+		}
+
+		if( config.showNotes ) {
+			dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
+		}
+
+		if( config.mouseWheel ) {
+			document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
+			document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
+		}
+		else {
+			document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
+			document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
+		}
+
+		// Rolling 3D links
+		if( config.rollingLinks ) {
+			enableRollingLinks();
+		}
+		else {
+			disableRollingLinks();
+		}
+
+		// Auto-hide the mouse pointer when its inactive
+		if( config.hideInactiveCursor ) {
+			document.addEventListener( 'mousemove', onDocumentCursorActive, false );
+			document.addEventListener( 'mousedown', onDocumentCursorActive, false );
+		}
+		else {
+			showCursor();
+
+			document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
+			document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
+		}
+
+		// Iframe link previews
+		if( config.previewLinks ) {
+			enablePreviewLinks();
+			disablePreviewLinks( '[data-preview-link=false]' );
+		}
+		else {
+			disablePreviewLinks();
+			enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
+		}
+
+		// Remove existing auto-slide controls
+		if( autoSlidePlayer ) {
+			autoSlidePlayer.destroy();
+			autoSlidePlayer = null;
+		}
+
+		// Generate auto-slide controls if needed
+		if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
+			autoSlidePlayer = new Playback( dom.wrapper, function() {
+				return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
+			} );
+
+			autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
+			autoSlidePaused = false;
+		}
+
+		// When fragments are turned off they should be visible
+		if( config.fragments === false ) {
+			toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
+				element.classList.add( 'visible' );
+				element.classList.remove( 'current-fragment' );
+			} );
+		}
+
+		// Slide numbers
+		var slideNumberDisplay = 'none';
+		if( config.slideNumber && !isPrintingPDF() ) {
+			if( config.showSlideNumber === 'all' ) {
+				slideNumberDisplay = 'block';
+			}
+			else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
+				slideNumberDisplay = 'block';
+			}
+		}
+
+		dom.slideNumber.style.display = slideNumberDisplay;
+
+		// Add the navigation mode to the DOM so we can adjust styling
+		if( config.navigationMode !== 'default' ) {
+			dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
+		}
+		else {
+			dom.wrapper.removeAttribute( 'data-navigation-mode' );
+		}
+
+		// Define our contextual list of keyboard shortcuts
+		if( config.navigationMode === 'linear' ) {
+			keyboardShortcuts['&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';
+			keyboardShortcuts['&#8592;  ,  &#8593;  ,  P  ,  H  ,  K']           = 'Previous slide';
+		}
+		else {
+			keyboardShortcuts['N  ,  SPACE']   = 'Next slide';
+			keyboardShortcuts['P']             = 'Previous slide';
+			keyboardShortcuts['&#8592;  ,  H'] = 'Navigate left';
+			keyboardShortcuts['&#8594;  ,  L'] = 'Navigate right';
+			keyboardShortcuts['&#8593;  ,  K'] = 'Navigate up';
+			keyboardShortcuts['&#8595;  ,  J'] = 'Navigate down';
+		}
+
+		keyboardShortcuts['Home  ,  Shift &#8592;']        = 'First slide';
+		keyboardShortcuts['End  ,  Shift &#8594;']         = 'Last slide';
+		keyboardShortcuts['B  ,  .']                       = 'Pause';
+		keyboardShortcuts['F']                             = 'Fullscreen';
+		keyboardShortcuts['ESC, O']                        = 'Slide overview';
+
+		sync();
+
+	}
+
+	/**
+	 * Binds all event listeners.
+	 */
+	function addEventListeners() {
+
+		eventsAreBound = true;
+
+		window.addEventListener( 'hashchange', onWindowHashChange, false );
+		window.addEventListener( 'resize', onWindowResize, false );
+
+		if( config.touch ) {
+			if( 'onpointerdown' in window ) {
+				// Use W3C pointer events
+				dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
+				dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
+				dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
+			}
+			else if( window.navigator.msPointerEnabled ) {
+				// IE 10 uses prefixed version of pointer events
+				dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
+				dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
+				dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
+			}
+			else {
+				// Fall back to touch events
+				dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
+				dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
+				dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
+			}
+		}
+
+		if( config.keyboard ) {
+			document.addEventListener( 'keydown', onDocumentKeyDown, false );
+			document.addEventListener( 'keypress', onDocumentKeyPress, false );
+		}
+
+		if( config.progress && dom.progress ) {
+			dom.progress.addEventListener( 'click', onProgressClicked, false );
+		}
+
+		dom.pauseOverlay.addEventListener( 'click', resume, false );
+
+		if( config.focusBodyOnPageVisibilityChange ) {
+			var visibilityChange;
+
+			if( 'hidden' in document ) {
+				visibilityChange = 'visibilitychange';
+			}
+			else if( 'msHidden' in document ) {
+				visibilityChange = 'msvisibilitychange';
+			}
+			else if( 'webkitHidden' in document ) {
+				visibilityChange = 'webkitvisibilitychange';
+			}
+
+			if( visibilityChange ) {
+				document.addEventListener( visibilityChange, onPageVisibilityChange, false );
+			}
+		}
+
+		// Listen to both touch and click events, in case the device
+		// supports both
+		var pointerEvents = [ 'touchstart', 'click' ];
+
+		// Only support touch for Android, fixes double navigations in
+		// stock browser
+		if( UA.match( /android/gi ) ) {
+			pointerEvents = [ 'touchstart' ];
+		}
+
+		pointerEvents.forEach( function( eventName ) {
+			dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
+			dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
+			dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
+			dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
+			dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
+			dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
+		} );
+
+	}
+
+	/**
+	 * Unbinds all event listeners.
+	 */
+	function removeEventListeners() {
+
+		eventsAreBound = false;
+
+		document.removeEventListener( 'keydown', onDocumentKeyDown, false );
+		document.removeEventListener( 'keypress', onDocumentKeyPress, false );
+		window.removeEventListener( 'hashchange', onWindowHashChange, false );
+		window.removeEventListener( 'resize', onWindowResize, false );
+
+		dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
+		dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
+		dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
+
+		dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
+		dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
+		dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
+
+		dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
+		dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
+		dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
+
+		dom.pauseOverlay.removeEventListener( 'click', resume, false );
+
+		if ( config.progress && dom.progress ) {
+			dom.progress.removeEventListener( 'click', onProgressClicked, false );
+		}
+
+		[ 'touchstart', 'click' ].forEach( function( eventName ) {
+			dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
+			dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
+			dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
+			dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
+			dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
+			dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
+		} );
+
+	}
+
+	/**
+	 * Registers a new plugin with this reveal.js instance.
+	 *
+	 * reveal.js waits for all regisered plugins to initialize
+	 * before considering itself ready, as long as the plugin
+	 * is registered before calling `Reveal.initialize()`.
+	 */
+	function registerPlugin( id, plugin ) {
+
+		if( plugins[id] === undefined ) {
+			plugins[id] = plugin;
+
+			// If a plugin is registered after reveal.js is loaded,
+			// initialize it right away
+			if( loaded && typeof plugin.init === 'function' ) {
+				plugin.init();
+			}
+		}
+		else {
+			console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
+		}
+
+	}
+
+	/**
+	 * Checks if a specific plugin has been registered.
+	 *
+	 * @param {String} id Unique plugin identifier
+	 */
+	function hasPlugin( id ) {
+
+		return !!plugins[id];
+
+	}
+
+	/**
+	 * Returns the specific plugin instance, if a plugin
+	 * with the given ID has been registered.
+	 *
+	 * @param {String} id Unique plugin identifier
+	 */
+	function getPlugin( id ) {
+
+		return plugins[id];
+
+	}
+
+	/**
+	 * Add a custom key binding with optional description to
+	 * be added to the help screen.
+	 */
+	function addKeyBinding( binding, callback ) {
+
+		if( typeof binding === 'object' && binding.keyCode ) {
+			registeredKeyBindings[binding.keyCode] = {
+				callback: callback,
+				key: binding.key,
+				description: binding.description
+			};
+		}
+		else {
+			registeredKeyBindings[binding] = {
+				callback: callback,
+				key: null,
+				description: null
+			};
+		}
+
+	}
+
+	/**
+	 * Removes the specified custom key binding.
+	 */
+	function removeKeyBinding( keyCode ) {
+
+		delete registeredKeyBindings[keyCode];
+
+	}
+
+	/**
+	 * Extend object a with the properties of object b.
+	 * If there's a conflict, object b takes precedence.
+	 *
+	 * @param {object} a
+	 * @param {object} b
+	 */
+	function extend( a, b ) {
+
+		for( var i in b ) {
+			a[ i ] = b[ i ];
+		}
+
+		return a;
+
+	}
+
+	/**
+	 * Converts the target object to an array.
+	 *
+	 * @param {object} o
+	 * @return {object[]}
+	 */
+	function toArray( o ) {
+
+		return Array.prototype.slice.call( o );
+
+	}
+
+	/**
+	 * Utility for deserializing a value.
+	 *
+	 * @param {*} value
+	 * @return {*}
+	 */
+	function deserialize( value ) {
+
+		if( typeof value === 'string' ) {
+			if( value === 'null' ) return null;
+			else if( value === 'true' ) return true;
+			else if( value === 'false' ) return false;
+			else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
+		}
+
+		return value;
+
+	}
+
+	/**
+	 * Measures the distance in pixels between point a
+	 * and point b.
+	 *
+	 * @param {object} a point with x/y properties
+	 * @param {object} b point with x/y properties
+	 *
+	 * @return {number}
+	 */
+	function distanceBetween( a, b ) {
+
+		var dx = a.x - b.x,
+			dy = a.y - b.y;
+
+		return Math.sqrt( dx*dx + dy*dy );
+
+	}
+
+	/**
+	 * Applies a CSS transform to the target element.
+	 *
+	 * @param {HTMLElement} element
+	 * @param {string} transform
+	 */
+	function transformElement( element, transform ) {
+
+		element.style.WebkitTransform = transform;
+		element.style.MozTransform = transform;
+		element.style.msTransform = transform;
+		element.style.transform = transform;
+
+	}
+
+	/**
+	 * Applies CSS transforms to the slides container. The container
+	 * is transformed from two separate sources: layout and the overview
+	 * mode.
+	 *
+	 * @param {object} transforms
+	 */
+	function transformSlides( transforms ) {
+
+		// Pick up new transforms from arguments
+		if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
+		if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
+
+		// Apply the transforms to the slides container
+		if( slidesTransform.layout ) {
+			transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
+		}
+		else {
+			transformElement( dom.slides, slidesTransform.overview );
+		}
+
+	}
+
+	/**
+	 * Injects the given CSS styles into the DOM.
+	 *
+	 * @param {string} value
+	 */
+	function injectStyleSheet( value ) {
+
+		var tag = document.createElement( 'style' );
+		tag.type = 'text/css';
+		if( tag.styleSheet ) {
+			tag.styleSheet.cssText = value;
+		}
+		else {
+			tag.appendChild( document.createTextNode( value ) );
+		}
+		document.getElementsByTagName( 'head' )[0].appendChild( tag );
+
+	}
+
+	/**
+	 * Find the closest parent that matches the given
+	 * selector.
+	 *
+	 * @param {HTMLElement} target The child element
+	 * @param {String} selector The CSS selector to match
+	 * the parents against
+	 *
+	 * @return {HTMLElement} The matched parent or null
+	 * if no matching parent was found
+	 */
+	function closestParent( target, selector ) {
+
+		var parent = target.parentNode;
+
+		while( parent ) {
+
+			// There's some overhead doing this each time, we don't
+			// want to rewrite the element prototype but should still
+			// be enough to feature detect once at startup...
+			var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
+
+			// If we find a match, we're all set
+			if( matchesMethod && matchesMethod.call( parent, selector ) ) {
+				return parent;
+			}
+
+			// Keep searching
+			parent = parent.parentNode;
+
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * Converts various color input formats to an {r:0,g:0,b:0} object.
+	 *
+	 * @param {string} color The string representation of a color
+	 * @example
+	 * colorToRgb('#000');
+	 * @example
+	 * colorToRgb('#000000');
+	 * @example
+	 * colorToRgb('rgb(0,0,0)');
+	 * @example
+	 * colorToRgb('rgba(0,0,0)');
+	 *
+	 * @return {{r: number, g: number, b: number, [a]: number}|null}
+	 */
+	function colorToRgb( color ) {
+
+		var hex3 = color.match( /^#([0-9a-f]{3})$/i );
+		if( hex3 && hex3[1] ) {
+			hex3 = hex3[1];
+			return {
+				r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
+				g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
+				b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
+			};
+		}
+
+		var hex6 = color.match( /^#([0-9a-f]{6})$/i );
+		if( hex6 && hex6[1] ) {
+			hex6 = hex6[1];
+			return {
+				r: parseInt( hex6.substr( 0, 2 ), 16 ),
+				g: parseInt( hex6.substr( 2, 2 ), 16 ),
+				b: parseInt( hex6.substr( 4, 2 ), 16 )
+			};
+		}
+
+		var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
+		if( rgb ) {
+			return {
+				r: parseInt( rgb[1], 10 ),
+				g: parseInt( rgb[2], 10 ),
+				b: parseInt( rgb[3], 10 )
+			};
+		}
+
+		var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
+		if( rgba ) {
+			return {
+				r: parseInt( rgba[1], 10 ),
+				g: parseInt( rgba[2], 10 ),
+				b: parseInt( rgba[3], 10 ),
+				a: parseFloat( rgba[4] )
+			};
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * Calculates brightness on a scale of 0-255.
+	 *
+	 * @param {string} color See colorToRgb for supported formats.
+	 * @see {@link colorToRgb}
+	 */
+	function colorBrightness( color ) {
+
+		if( typeof color === 'string' ) color = colorToRgb( color );
+
+		if( color ) {
+			return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * Returns the remaining height within the parent of the
+	 * target element.
+	 *
+	 * remaining height = [ configured parent height ] - [ current parent height ]
+	 *
+	 * @param {HTMLElement} element
+	 * @param {number} [height]
+	 */
+	function getRemainingHeight( element, height ) {
+
+		height = height || 0;
+
+		if( element ) {
+			var newHeight, oldHeight = element.style.height;
+
+			// Change the .stretch element height to 0 in order find the height of all
+			// the other elements
+			element.style.height = '0px';
+
+			// In Overview mode, the parent (.slide) height is set of 700px.
+			// Restore it temporarily to its natural height.
+			element.parentNode.style.height = 'auto';
+
+			newHeight = height - element.parentNode.offsetHeight;
+
+			// Restore the old height, just in case
+			element.style.height = oldHeight + 'px';
+
+			// Clear the parent (.slide) height. .removeProperty works in IE9+
+			element.parentNode.style.removeProperty('height');
+
+			return newHeight;
+		}
+
+		return height;
+
+	}
+
+	/**
+	 * Checks if this instance is being used to print a PDF.
+	 */
+	function isPrintingPDF() {
+
+		return ( /print-pdf/gi ).test( window.location.search );
+
+	}
+
+	/**
+	 * Hides the address bar if we're on a mobile device.
+	 */
+	function hideAddressBar() {
+
+		if( config.hideAddressBar && isMobileDevice ) {
+			// Events that should trigger the address bar to hide
+			window.addEventListener( 'load', removeAddressBar, false );
+			window.addEventListener( 'orientationchange', removeAddressBar, false );
+		}
+
+	}
+
+	/**
+	 * Causes the address bar to hide on mobile devices,
+	 * more vertical space ftw.
+	 */
+	function removeAddressBar() {
+
+		setTimeout( function() {
+			window.scrollTo( 0, 1 );
+		}, 10 );
+
+	}
+
+	/**
+	 * Dispatches an event of the specified type from the
+	 * reveal DOM element.
+	 */
+	function dispatchEvent( type, args ) {
+
+		var event = document.createEvent( 'HTMLEvents', 1, 2 );
+		event.initEvent( type, true, true );
+		extend( event, args );
+		dom.wrapper.dispatchEvent( event );
+
+		// If we're in an iframe, post each reveal.js event to the
+		// parent window. Used by the notes plugin
+		dispatchPostMessage( type );
+
+	}
+
+	/**
+	 * Dispatched a postMessage of the given type from our window.
+	 */
+	function dispatchPostMessage( type, data ) {
+
+		if( config.postMessageEvents && window.parent !== window.self ) {
+			var message = {
+				namespace: 'reveal',
+				eventName: type,
+				state: getState()
+			};
+
+			extend( message, data );
+
+			window.parent.postMessage( JSON.stringify( message ), '*' );
+		}
+
+	}
+
+	/**
+	 * Wrap all links in 3D goodness.
+	 */
+	function enableRollingLinks() {
+
+		if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
+			var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
+
+			for( var i = 0, len = anchors.length; i < len; i++ ) {
+				var anchor = anchors[i];
+
+				if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
+					var span = document.createElement('span');
+					span.setAttribute('data-title', anchor.text);
+					span.innerHTML = anchor.innerHTML;
+
+					anchor.classList.add( 'roll' );
+					anchor.innerHTML = '';
+					anchor.appendChild(span);
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * Unwrap all 3D links.
+	 */
+	function disableRollingLinks() {
+
+		var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
+
+		for( var i = 0, len = anchors.length; i < len; i++ ) {
+			var anchor = anchors[i];
+			var span = anchor.querySelector( 'span' );
+
+			if( span ) {
+				anchor.classList.remove( 'roll' );
+				anchor.innerHTML = span.innerHTML;
+			}
+		}
+
+	}
+
+	/**
+	 * Bind preview frame links.
+	 *
+	 * @param {string} [selector=a] - selector for anchors
+	 */
+	function enablePreviewLinks( selector ) {
+
+		var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
+
+		anchors.forEach( function( element ) {
+			if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
+				element.addEventListener( 'click', onPreviewLinkClicked, false );
+			}
+		} );
+
+	}
+
+	/**
+	 * Unbind preview frame links.
+	 */
+	function disablePreviewLinks( selector ) {
+
+		var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
+
+		anchors.forEach( function( element ) {
+			if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
+				element.removeEventListener( 'click', onPreviewLinkClicked, false );
+			}
+		} );
+
+	}
+
+	/**
+	 * Opens a preview window for the target URL.
+	 *
+	 * @param {string} url - url for preview iframe src
+	 */
+	function showPreview( url ) {
+
+		closeOverlay();
+
+		dom.overlay = document.createElement( 'div' );
+		dom.overlay.classList.add( 'overlay' );
+		dom.overlay.classList.add( 'overlay-preview' );
+		dom.wrapper.appendChild( dom.overlay );
+
+		dom.overlay.innerHTML = [
+			'<header>',
+				'<a class="close" href="#"><span class="icon"></span></a>',
+				'<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
+			'</header>',
+			'<div class="spinner"></div>',
+			'<div class="viewport">',
+				'<iframe src="'+ url +'"></iframe>',
+				'<small class="viewport-inner">',
+					'<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
+				'</small>',
+			'</div>'
+		].join('');
+
+		dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
+			dom.overlay.classList.add( 'loaded' );
+		}, false );
+
+		dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
+			closeOverlay();
+			event.preventDefault();
+		}, false );
+
+		dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
+			closeOverlay();
+		}, false );
+
+		setTimeout( function() {
+			dom.overlay.classList.add( 'visible' );
+		}, 1 );
+
+	}
+
+	/**
+	 * Open or close help overlay window.
+	 *
+	 * @param {Boolean} [override] Flag which overrides the
+	 * toggle logic and forcibly sets the desired state. True means
+	 * help is open, false means it's closed.
+	 */
+	function toggleHelp( override ){
+
+		if( typeof override === 'boolean' ) {
+			override ? showHelp() : closeOverlay();
+		}
+		else {
+			if( dom.overlay ) {
+				closeOverlay();
+			}
+			else {
+				showHelp();
+			}
+		}
+	}
+
+	/**
+	 * Opens an overlay window with help material.
+	 */
+	function showHelp() {
+
+		if( config.help ) {
+
+			closeOverlay();
+
+			dom.overlay = document.createElement( 'div' );
+			dom.overlay.classList.add( 'overlay' );
+			dom.overlay.classList.add( 'overlay-help' );
+			dom.wrapper.appendChild( dom.overlay );
+
+			var html = '<p class="title">Keyboard Shortcuts</p><br/>';
+
+			html += '<table><th>KEY</th><th>ACTION</th>';
+			for( var key in keyboardShortcuts ) {
+				html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
+			}
+
+			// Add custom key bindings that have associated descriptions
+			for( var binding in registeredKeyBindings ) {
+				if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
+					html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
+				}
+			}
+
+			html += '</table>';
+
+			dom.overlay.innerHTML = [
+				'<header>',
+					'<a class="close" href="#"><span class="icon"></span></a>',
+				'</header>',
+				'<div class="viewport">',
+					'<div class="viewport-inner">'+ html +'</div>',
+				'</div>'
+			].join('');
+
+			dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
+				closeOverlay();
+				event.preventDefault();
+			}, false );
+
+			setTimeout( function() {
+				dom.overlay.classList.add( 'visible' );
+			}, 1 );
+
+		}
+
+	}
+
+	/**
+	 * Closes any currently open overlay.
+	 */
+	function closeOverlay() {
+
+		if( dom.overlay ) {
+			dom.overlay.parentNode.removeChild( dom.overlay );
+			dom.overlay = null;
+		}
+
+	}
+
+	/**
+	 * Applies JavaScript-controlled layout rules to the
+	 * presentation.
+	 */
+	function layout() {
+
+		if( dom.wrapper && !isPrintingPDF() ) {
+
+			if( !config.disableLayout ) {
+
+				// On some mobile devices '100vh' is taller than the visible
+				// viewport which leads to part of the presentation being
+				// cut off. To work around this we define our own '--vh' custom
+				// property where 100x adds up to the correct height.
+				//
+				// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
+				if( isMobileDevice ) {
+					document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
+				}
+
+				var size = getComputedSlideSize();
+
+				var oldScale = scale;
+
+				// Layout the contents of the slides
+				layoutSlideContents( config.width, config.height );
+
+				dom.slides.style.width = size.width + 'px';
+				dom.slides.style.height = size.height + 'px';
+
+				// Determine scale of content to fit within available space
+				scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
+
+				// Respect max/min scale settings
+				scale = Math.max( scale, config.minScale );
+				scale = Math.min( scale, config.maxScale );
+
+				// Don't apply any scaling styles if scale is 1
+				if( scale === 1 ) {
+					dom.slides.style.zoom = '';
+					dom.slides.style.left = '';
+					dom.slides.style.top = '';
+					dom.slides.style.bottom = '';
+					dom.slides.style.right = '';
+					transformSlides( { layout: '' } );
+				}
+				else {
+					// Zoom Scaling
+					// Content remains crisp no matter how much we scale. Side
+					// effects are minor differences in text layout and iframe
+					// viewports changing size. A 200x200 iframe viewport in a
+					// 2x zoomed presentation ends up having a 400x400 viewport.
+					if( scale > 1 && features.zoom && window.devicePixelRatio < 2 ) {
+						dom.slides.style.zoom = scale;
+						dom.slides.style.left = '';
+						dom.slides.style.top = '';
+						dom.slides.style.bottom = '';
+						dom.slides.style.right = '';
+						transformSlides( { layout: '' } );
+					}
+					// Transform Scaling
+					// Content layout remains the exact same when scaled up.
+					// Side effect is content becoming blurred, especially with
+					// high scale values on ldpi screens.
+					else {
+						dom.slides.style.zoom = '';
+						dom.slides.style.left = '50%';
+						dom.slides.style.top = '50%';
+						dom.slides.style.bottom = 'auto';
+						dom.slides.style.right = 'auto';
+						transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
+					}
+				}
+
+				// Select all slides, vertical and horizontal
+				var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
+
+				for( var i = 0, len = slides.length; i < len; i++ ) {
+					var slide = slides[ i ];
+
+					// Don't bother updating invisible slides
+					if( slide.style.display === 'none' ) {
+						continue;
+					}
+
+					if( config.center || slide.classList.contains( 'center' ) ) {
+						// Vertical stacks are not centred since their section
+						// children will be
+						if( slide.classList.contains( 'stack' ) ) {
+							slide.style.top = 0;
+						}
+						else {
+							slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
+						}
+					}
+					else {
+						slide.style.top = '';
+					}
+
+				}
+
+				if( oldScale !== scale ) {
+					dispatchEvent( 'resize', {
+						'oldScale': oldScale,
+						'scale': scale,
+						'size': size
+					} );
+				}
+			}
+
+			updateProgress();
+			updateParallax();
+
+			if( isOverview() ) {
+				updateOverview();
+			}
+
+		}
+
+	}
+
+	/**
+	 * Applies layout logic to the contents of all slides in
+	 * the presentation.
+	 *
+	 * @param {string|number} width
+	 * @param {string|number} height
+	 */
+	function layoutSlideContents( width, height ) {
+
+		// Handle sizing of elements with the 'stretch' class
+		toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
+
+			// Determine how much vertical space we can use
+			var remainingHeight = getRemainingHeight( element, height );
+
+			// Consider the aspect ratio of media elements
+			if( /(img|video)/gi.test( element.nodeName ) ) {
+				var nw = element.naturalWidth || element.videoWidth,
+					nh = element.naturalHeight || element.videoHeight;
+
+				var es = Math.min( width / nw, remainingHeight / nh );
+
+				element.style.width = ( nw * es ) + 'px';
+				element.style.height = ( nh * es ) + 'px';
+
+			}
+			else {
+				element.style.width = width + 'px';
+				element.style.height = remainingHeight + 'px';
+			}
+
+		} );
+
+	}
+
+	/**
+	 * Calculates the computed pixel size of our slides. These
+	 * values are based on the width and height configuration
+	 * options.
+	 *
+	 * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
+	 * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
+	 */
+	function getComputedSlideSize( presentationWidth, presentationHeight ) {
+
+		var size = {
+			// Slide size
+			width: config.width,
+			height: config.height,
+
+			// Presentation size
+			presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
+			presentationHeight: presentationHeight || dom.wrapper.offsetHeight
+		};
+
+		// Reduce available space by margin
+		size.presentationWidth -= ( size.presentationWidth * config.margin );
+		size.presentationHeight -= ( size.presentationHeight * config.margin );
+
+		// Slide width may be a percentage of available width
+		if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
+			size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
+		}
+
+		// Slide height may be a percentage of available height
+		if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
+			size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
+		}
+
+		return size;
+
+	}
+
+	/**
+	 * Stores the vertical index of a stack so that the same
+	 * vertical slide can be selected when navigating to and
+	 * from the stack.
+	 *
+	 * @param {HTMLElement} stack The vertical stack element
+	 * @param {string|number} [v=0] Index to memorize
+	 */
+	function setPreviousVerticalIndex( stack, v ) {
+
+		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
+			stack.setAttribute( 'data-previous-indexv', v || 0 );
+		}
+
+	}
+
+	/**
+	 * Retrieves the vertical index which was stored using
+	 * #setPreviousVerticalIndex() or 0 if no previous index
+	 * exists.
+	 *
+	 * @param {HTMLElement} stack The vertical stack element
+	 */
+	function getPreviousVerticalIndex( stack ) {
+
+		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
+			// Prefer manually defined start-indexv
+			var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
+
+			return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
+		}
+
+		return 0;
+
+	}
+
+	/**
+	 * Displays the overview of slides (quick nav) by scaling
+	 * down and arranging all slide elements.
+	 */
+	function activateOverview() {
+
+		// Only proceed if enabled in config
+		if( config.overview && !isOverview() ) {
+
+			overview = true;
+
+			dom.wrapper.classList.add( 'overview' );
+			dom.wrapper.classList.remove( 'overview-deactivating' );
+
+			if( features.overviewTransitions ) {
+				setTimeout( function() {
+					dom.wrapper.classList.add( 'overview-animated' );
+				}, 1 );
+			}
+
+			// Don't auto-slide while in overview mode
+			cancelAutoSlide();
+
+			// Move the backgrounds element into the slide container to
+			// that the same scaling is applied
+			dom.slides.appendChild( dom.background );
+
+			// Clicking on an overview slide navigates to it
+			toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+				if( !slide.classList.contains( 'stack' ) ) {
+					slide.addEventListener( 'click', onOverviewSlideClicked, true );
+				}
+			} );
+
+			// Calculate slide sizes
+			var margin = 70;
+			var slideSize = getComputedSlideSize();
+			overviewSlideWidth = slideSize.width + margin;
+			overviewSlideHeight = slideSize.height + margin;
+
+			// Reverse in RTL mode
+			if( config.rtl ) {
+				overviewSlideWidth = -overviewSlideWidth;
+			}
+
+			updateSlidesVisibility();
+			layoutOverview();
+			updateOverview();
+
+			layout();
+
+			// Notify observers of the overview showing
+			dispatchEvent( 'overviewshown', {
+				'indexh': indexh,
+				'indexv': indexv,
+				'currentSlide': currentSlide
+			} );
+
+		}
+
+	}
+
+	/**
+	 * Uses CSS transforms to position all slides in a grid for
+	 * display inside of the overview mode.
+	 */
+	function layoutOverview() {
+
+		// Layout slides
+		toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
+			hslide.setAttribute( 'data-index-h', h );
+			transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
+
+			if( hslide.classList.contains( 'stack' ) ) {
+
+				toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
+					vslide.setAttribute( 'data-index-h', h );
+					vslide.setAttribute( 'data-index-v', v );
+
+					transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
+				} );
+
+			}
+		} );
+
+		// Layout slide backgrounds
+		toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
+			transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
+
+			toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
+				transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
+			} );
+		} );
+
+	}
+
+	/**
+	 * Moves the overview viewport to the current slides.
+	 * Called each time the current slide changes.
+	 */
+	function updateOverview() {
+
+		var vmin = Math.min( window.innerWidth, window.innerHeight );
+		var scale = Math.max( vmin / 5, 150 ) / vmin;
+
+		transformSlides( {
+			overview: [
+				'scale('+ scale +')',
+				'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
+				'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
+			].join( ' ' )
+		} );
+
+	}
+
+	/**
+	 * Exits the slide overview and enters the currently
+	 * active slide.
+	 */
+	function deactivateOverview() {
+
+		// Only proceed if enabled in config
+		if( config.overview ) {
+
+			overview = false;
+
+			dom.wrapper.classList.remove( 'overview' );
+			dom.wrapper.classList.remove( 'overview-animated' );
+
+			// Temporarily add a class so that transitions can do different things
+			// depending on whether they are exiting/entering overview, or just
+			// moving from slide to slide
+			dom.wrapper.classList.add( 'overview-deactivating' );
+
+			setTimeout( function () {
+				dom.wrapper.classList.remove( 'overview-deactivating' );
+			}, 1 );
+
+			// Move the background element back out
+			dom.wrapper.appendChild( dom.background );
+
+			// Clean up changes made to slides
+			toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
+				transformElement( slide, '' );
+
+				slide.removeEventListener( 'click', onOverviewSlideClicked, true );
+			} );
+
+			// Clean up changes made to backgrounds
+			toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
+				transformElement( background, '' );
+			} );
+
+			transformSlides( { overview: '' } );
+
+			slide( indexh, indexv );
+
+			layout();
+
+			cueAutoSlide();
+
+			// Notify observers of the overview hiding
+			dispatchEvent( 'overviewhidden', {
+				'indexh': indexh,
+				'indexv': indexv,
+				'currentSlide': currentSlide
+			} );
+
+		}
+	}
+
+	/**
+	 * Toggles the slide overview mode on and off.
+	 *
+	 * @param {Boolean} [override] Flag which overrides the
+	 * toggle logic and forcibly sets the desired state. True means
+	 * overview is open, false means it's closed.
+	 */
+	function toggleOverview( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? activateOverview() : deactivateOverview();
+		}
+		else {
+			isOverview() ? deactivateOverview() : activateOverview();
+		}
+
+	}
+
+	/**
+	 * Checks if the overview is currently active.
+	 *
+	 * @return {Boolean} true if the overview is active,
+	 * false otherwise
+	 */
+	function isOverview() {
+
+		return overview;
+
+	}
+
+	/**
+	 * Return a hash URL that will resolve to the given slide location.
+	 *
+	 * @param {HTMLElement} [slide=currentSlide] The slide to link to
+	 */
+	function locationHash( slide ) {
+
+		var url = '/';
+
+		// Attempt to create a named link based on the slide's ID
+		var s = slide || currentSlide;
+		var id = s ? s.getAttribute( 'id' ) : null;
+		if( id ) {
+			id = encodeURIComponent( id );
+		}
+
+		var index = getIndices( slide );
+		if( !config.fragmentInURL ) {
+			index.f = undefined;
+		}
+
+		// If the current slide has an ID, use that as a named link,
+		// but we don't support named links with a fragment index
+		if( typeof id === 'string' && id.length && index.f === undefined ) {
+			url = '/' + id;
+		}
+		// Otherwise use the /h/v index
+		else {
+			var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+			if( index.h > 0 || index.v > 0 || index.f !== undefined ) url += index.h + hashIndexBase;
+			if( index.v > 0 || index.f !== undefined ) url += '/' + (index.v + hashIndexBase );
+			if( index.f !== undefined ) url += '/' + index.f;
+		}
+
+		return url;
+
+	}
+
+	/**
+	 * Checks if the current or specified slide is vertical
+	 * (nested within another slide).
+	 *
+	 * @param {HTMLElement} [slide=currentSlide] The slide to check
+	 * orientation of
+	 * @return {Boolean}
+	 */
+	function isVerticalSlide( slide ) {
+
+		// Prefer slide argument, otherwise use current slide
+		slide = slide ? slide : currentSlide;
+
+		return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
+
+	}
+
+	/**
+	 * Handling the fullscreen functionality via the fullscreen API
+	 *
+	 * @see http://fullscreen.spec.whatwg.org/
+	 * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
+	 */
+	function enterFullscreen() {
+
+		var element = document.documentElement;
+
+		// Check which implementation is available
+		var requestMethod = element.requestFullscreen ||
+							element.webkitRequestFullscreen ||
+							element.webkitRequestFullScreen ||
+							element.mozRequestFullScreen ||
+							element.msRequestFullscreen;
+
+		if( requestMethod ) {
+			requestMethod.apply( element );
+		}
+
+	}
+
+	/**
+	 * Shows the mouse pointer after it has been hidden with
+	 * #hideCursor.
+	 */
+	function showCursor() {
+
+		if( cursorHidden ) {
+			cursorHidden = false;
+			dom.wrapper.style.cursor = '';
+		}
+
+	}
+
+	/**
+	 * Hides the mouse pointer when it's on top of the .reveal
+	 * container.
+	 */
+	function hideCursor() {
+
+		if( cursorHidden === false ) {
+			cursorHidden = true;
+			dom.wrapper.style.cursor = 'none';
+		}
+
+	}
+
+	/**
+	 * Enters the paused mode which fades everything on screen to
+	 * black.
+	 */
+	function pause() {
+
+		if( config.pause ) {
+			var wasPaused = dom.wrapper.classList.contains( 'paused' );
+
+			cancelAutoSlide();
+			dom.wrapper.classList.add( 'paused' );
+
+			if( wasPaused === false ) {
+				dispatchEvent( 'paused' );
+			}
+		}
+
+	}
+
+	/**
+	 * Exits from the paused mode.
+	 */
+	function resume() {
+
+		var wasPaused = dom.wrapper.classList.contains( 'paused' );
+		dom.wrapper.classList.remove( 'paused' );
+
+		cueAutoSlide();
+
+		if( wasPaused ) {
+			dispatchEvent( 'resumed' );
+		}
+
+	}
+
+	/**
+	 * Toggles the paused mode on and off.
+	 */
+	function togglePause( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? pause() : resume();
+		}
+		else {
+			isPaused() ? resume() : pause();
+		}
+
+	}
+
+	/**
+	 * Checks if we are currently in the paused mode.
+	 *
+	 * @return {Boolean}
+	 */
+	function isPaused() {
+
+		return dom.wrapper.classList.contains( 'paused' );
+
+	}
+
+	/**
+	 * Toggles the auto slide mode on and off.
+	 *
+	 * @param {Boolean} [override] Flag which sets the desired state.
+	 * True means autoplay starts, false means it stops.
+	 */
+
+	function toggleAutoSlide( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? resumeAutoSlide() : pauseAutoSlide();
+		}
+
+		else {
+			autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
+		}
+
+	}
+
+	/**
+	 * Checks if the auto slide mode is currently on.
+	 *
+	 * @return {Boolean}
+	 */
+	function isAutoSliding() {
+
+		return !!( autoSlide && !autoSlidePaused );
+
+	}
+
+	/**
+	 * Steps from the current point in the presentation to the
+	 * slide which matches the specified horizontal and vertical
+	 * indices.
+	 *
+	 * @param {number} [h=indexh] Horizontal index of the target slide
+	 * @param {number} [v=indexv] Vertical index of the target slide
+	 * @param {number} [f] Index of a fragment within the
+	 * target slide to activate
+	 * @param {number} [o] Origin for use in multimaster environments
+	 */
+	function slide( h, v, f, o ) {
+
+		// Remember where we were at before
+		previousSlide = currentSlide;
+
+		// Query all horizontal slides in the deck
+		var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
+
+		// Abort if there are no slides
+		if( horizontalSlides.length === 0 ) return;
+
+		// If no vertical index is specified and the upcoming slide is a
+		// stack, resume at its previous vertical index
+		if( v === undefined && !isOverview() ) {
+			v = getPreviousVerticalIndex( horizontalSlides[ h ] );
+		}
+
+		// If we were on a vertical stack, remember what vertical index
+		// it was on so we can resume at the same position when returning
+		if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
+			setPreviousVerticalIndex( previousSlide.parentNode, indexv );
+		}
+
+		// Remember the state before this slide
+		var stateBefore = state.concat();
+
+		// Reset the state array
+		state.length = 0;
+
+		var indexhBefore = indexh || 0,
+			indexvBefore = indexv || 0;
+
+		// Activate and transition to the new slide
+		indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
+		indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
+
+		// Update the visibility of slides now that the indices have changed
+		updateSlidesVisibility();
+
+		layout();
+
+		// Update the overview if it's currently active
+		if( isOverview() ) {
+			updateOverview();
+		}
+
+		// Find the current horizontal slide and any possible vertical slides
+		// within it
+		var currentHorizontalSlide = horizontalSlides[ indexh ],
+			currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
+
+		// Store references to the previous and current slides
+		currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
+
+		// Show fragment, if specified
+		if( typeof f !== 'undefined' ) {
+			navigateFragment( f );
+		}
+
+		// Dispatch an event if the slide changed
+		var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
+		if (!slideChanged) {
+			// Ensure that the previous slide is never the same as the current
+			previousSlide = null;
+		}
+
+		// Solves an edge case where the previous slide maintains the
+		// 'present' class when navigating between adjacent vertical
+		// stacks
+		if( previousSlide && previousSlide !== currentSlide ) {
+			previousSlide.classList.remove( 'present' );
+			previousSlide.setAttribute( 'aria-hidden', 'true' );
+
+			// Reset all slides upon navigate to home
+			// Issue: #285
+			if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
+				// Launch async task
+				setTimeout( function () {
+					var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
+					for( i in slides ) {
+						if( slides[i] ) {
+							// Reset stack
+							setPreviousVerticalIndex( slides[i], 0 );
+						}
+					}
+				}, 0 );
+			}
+		}
+
+		// Apply the new state
+		stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
+			// Check if this state existed on the previous slide. If it
+			// did, we will avoid adding it repeatedly
+			for( var j = 0; j < stateBefore.length; j++ ) {
+				if( stateBefore[j] === state[i] ) {
+					stateBefore.splice( j, 1 );
+					continue stateLoop;
+				}
+			}
+
+			document.documentElement.classList.add( state[i] );
+
+			// Dispatch custom event matching the state's name
+			dispatchEvent( state[i] );
+		}
+
+		// Clean up the remains of the previous state
+		while( stateBefore.length ) {
+			document.documentElement.classList.remove( stateBefore.pop() );
+		}
+
+		if( slideChanged ) {
+			dispatchEvent( 'slidechanged', {
+				'indexh': indexh,
+				'indexv': indexv,
+				'previousSlide': previousSlide,
+				'currentSlide': currentSlide,
+				'origin': o
+			} );
+		}
+
+		// Handle embedded content
+		if( slideChanged || !previousSlide ) {
+			stopEmbeddedContent( previousSlide );
+			startEmbeddedContent( currentSlide );
+		}
+
+		// Announce the current slide contents, for screen readers
+		dom.statusDiv.textContent = getStatusText( currentSlide );
+
+		updateControls();
+		updateProgress();
+		updateBackground();
+		updateParallax();
+		updateSlideNumber();
+		updateNotes();
+		updateFragments();
+
+		// Update the URL hash
+		writeURL();
+
+		cueAutoSlide();
+
+	}
+
+	/**
+	 * Syncs the presentation with the current DOM. Useful
+	 * when new slides or control elements are added or when
+	 * the configuration has changed.
+	 */
+	function sync() {
+
+		// Subscribe to input
+		removeEventListeners();
+		addEventListeners();
+
+		// Force a layout to make sure the current config is accounted for
+		layout();
+
+		// Reflect the current autoSlide value
+		autoSlide = config.autoSlide;
+
+		// Start auto-sliding if it's enabled
+		cueAutoSlide();
+
+		// Re-create the slide backgrounds
+		createBackgrounds();
+
+		// Write the current hash to the URL
+		writeURL();
+
+		sortAllFragments();
+
+		updateControls();
+		updateProgress();
+		updateSlideNumber();
+		updateSlidesVisibility();
+		updateBackground( true );
+		updateNotesVisibility();
+		updateNotes();
+
+		formatEmbeddedContent();
+
+		// Start or stop embedded content depending on global config
+		if( config.autoPlayMedia === false ) {
+			stopEmbeddedContent( currentSlide, { unloadIframes: false } );
+		}
+		else {
+			startEmbeddedContent( currentSlide );
+		}
+
+		if( isOverview() ) {
+			layoutOverview();
+		}
+
+	}
+
+	/**
+	 * Updates reveal.js to keep in sync with new slide attributes. For
+	 * example, if you add a new `data-background-image` you can call
+	 * this to have reveal.js render the new background image.
+	 *
+	 * Similar to #sync() but more efficient when you only need to
+	 * refresh a specific slide.
+	 *
+	 * @param {HTMLElement} slide
+	 */
+	function syncSlide( slide ) {
+
+		// Default to the current slide
+		slide = slide || currentSlide;
+
+		syncBackground( slide );
+		syncFragments( slide );
+
+		loadSlide( slide );
+
+		updateBackground();
+		updateNotes();
+
+	}
+
+	/**
+	 * Formats the fragments on the given slide so that they have
+	 * valid indices. Call this if fragments are changed in the DOM
+	 * after reveal.js has already initialized.
+	 *
+	 * @param {HTMLElement} slide
+	 * @return {Array} a list of the HTML fragments that were synced
+	 */
+	function syncFragments( slide ) {
+
+		// Default to the current slide
+		slide = slide || currentSlide;
+
+		return sortFragments( slide.querySelectorAll( '.fragment' ) );
+
+	}
+
+	/**
+	 * Resets all vertical slides so that only the first
+	 * is visible.
+	 */
+	function resetVerticalSlides() {
+
+		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+		horizontalSlides.forEach( function( horizontalSlide ) {
+
+			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
+			verticalSlides.forEach( function( verticalSlide, y ) {
+
+				if( y > 0 ) {
+					verticalSlide.classList.remove( 'present' );
+					verticalSlide.classList.remove( 'past' );
+					verticalSlide.classList.add( 'future' );
+					verticalSlide.setAttribute( 'aria-hidden', 'true' );
+				}
+
+			} );
+
+		} );
+
+	}
+
+	/**
+	 * Sorts and formats all of fragments in the
+	 * presentation.
+	 */
+	function sortAllFragments() {
+
+		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+		horizontalSlides.forEach( function( horizontalSlide ) {
+
+			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
+			verticalSlides.forEach( function( verticalSlide, y ) {
+
+				sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
+
+			} );
+
+			if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
+
+		} );
+
+	}
+
+	/**
+	 * Randomly shuffles all slides in the deck.
+	 */
+	function shuffle() {
+
+		var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+
+		slides.forEach( function( slide ) {
+
+			// Insert this slide next to another random slide. This may
+			// cause the slide to insert before itself but that's fine.
+			dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
+
+		} );
+
+	}
+
+	/**
+	 * Updates one dimension of slides by showing the slide
+	 * with the specified index.
+	 *
+	 * @param {string} selector A CSS selector that will fetch
+	 * the group of slides we are working with
+	 * @param {number} index The index of the slide that should be
+	 * shown
+	 *
+	 * @return {number} The index of the slide that is now shown,
+	 * might differ from the passed in index if it was out of
+	 * bounds.
+	 */
+	function updateSlides( selector, index ) {
+
+		// Select all slides and convert the NodeList result to
+		// an array
+		var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
+			slidesLength = slides.length;
+
+		var printMode = isPrintingPDF();
+
+		if( slidesLength ) {
+
+			// Should the index loop?
+			if( config.loop ) {
+				index %= slidesLength;
+
+				if( index < 0 ) {
+					index = slidesLength + index;
+				}
+			}
+
+			// Enforce max and minimum index bounds
+			index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
+
+			for( var i = 0; i < slidesLength; i++ ) {
+				var element = slides[i];
+
+				var reverse = config.rtl && !isVerticalSlide( element );
+
+				element.classList.remove( 'past' );
+				element.classList.remove( 'present' );
+				element.classList.remove( 'future' );
+
+				// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
+				element.setAttribute( 'hidden', '' );
+				element.setAttribute( 'aria-hidden', 'true' );
+
+				// If this element contains vertical slides
+				if( element.querySelector( 'section' ) ) {
+					element.classList.add( 'stack' );
+				}
+
+				// If we're printing static slides, all slides are "present"
+				if( printMode ) {
+					element.classList.add( 'present' );
+					continue;
+				}
+
+				if( i < index ) {
+					// Any element previous to index is given the 'past' class
+					element.classList.add( reverse ? 'future' : 'past' );
+
+					if( config.fragments ) {
+						// Show all fragments in prior slides
+						toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
+							fragment.classList.add( 'visible' );
+							fragment.classList.remove( 'current-fragment' );
+						} );
+					}
+				}
+				else if( i > index ) {
+					// Any element subsequent to index is given the 'future' class
+					element.classList.add( reverse ? 'past' : 'future' );
+
+					if( config.fragments ) {
+						// Hide all fragments in future slides
+						toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
+							fragment.classList.remove( 'visible' );
+							fragment.classList.remove( 'current-fragment' );
+						} );
+					}
+				}
+			}
+
+			// Mark the current slide as present
+			slides[index].classList.add( 'present' );
+			slides[index].removeAttribute( 'hidden' );
+			slides[index].removeAttribute( 'aria-hidden' );
+
+			// If this slide has a state associated with it, add it
+			// onto the current state of the deck
+			var slideState = slides[index].getAttribute( 'data-state' );
+			if( slideState ) {
+				state = state.concat( slideState.split( ' ' ) );
+			}
+
+		}
+		else {
+			// Since there are no slides we can't be anywhere beyond the
+			// zeroth index
+			index = 0;
+		}
+
+		return index;
+
+	}
+
+	/**
+	 * Optimization method; hide all slides that are far away
+	 * from the present slide.
+	 */
+	function updateSlidesVisibility() {
+
+		// Select all slides and convert the NodeList result to
+		// an array
+		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
+			horizontalSlidesLength = horizontalSlides.length,
+			distanceX,
+			distanceY;
+
+		if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
+
+			// The number of steps away from the present slide that will
+			// be visible
+			var viewDistance = isOverview() ? 10 : config.viewDistance;
+
+			// Shorten the view distance on devices that typically have
+			// less resources
+			if( isMobileDevice ) {
+				viewDistance = isOverview() ? 6 : config.mobileViewDistance;
+			}
+
+			// All slides need to be visible when exporting to PDF
+			if( isPrintingPDF() ) {
+				viewDistance = Number.MAX_VALUE;
+			}
+
+			for( var x = 0; x < horizontalSlidesLength; x++ ) {
+				var horizontalSlide = horizontalSlides[x];
+
+				var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
+					verticalSlidesLength = verticalSlides.length;
+
+				// Determine how far away this slide is from the present
+				distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
+
+				// If the presentation is looped, distance should measure
+				// 1 between the first and last slides
+				if( config.loop ) {
+					distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
+				}
+
+				// Show the horizontal slide if it's within the view distance
+				if( distanceX < viewDistance ) {
+					loadSlide( horizontalSlide );
+				}
+				else {
+					unloadSlide( horizontalSlide );
+				}
+
+				if( verticalSlidesLength ) {
+
+					var oy = getPreviousVerticalIndex( horizontalSlide );
+
+					for( var y = 0; y < verticalSlidesLength; y++ ) {
+						var verticalSlide = verticalSlides[y];
+
+						distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
+
+						if( distanceX + distanceY < viewDistance ) {
+							loadSlide( verticalSlide );
+						}
+						else {
+							unloadSlide( verticalSlide );
+						}
+					}
+
+				}
+			}
+
+			// Flag if there are ANY vertical slides, anywhere in the deck
+			if( hasVerticalSlides() ) {
+				dom.wrapper.classList.add( 'has-vertical-slides' );
+			}
+			else {
+				dom.wrapper.classList.remove( 'has-vertical-slides' );
+			}
+
+			// Flag if there are ANY horizontal slides, anywhere in the deck
+			if( hasHorizontalSlides() ) {
+				dom.wrapper.classList.add( 'has-horizontal-slides' );
+			}
+			else {
+				dom.wrapper.classList.remove( 'has-horizontal-slides' );
+			}
+
+		}
+
+	}
+
+	/**
+	 * Pick up notes from the current slide and display them
+	 * to the viewer.
+	 *
+	 * @see {@link config.showNotes}
+	 */
+	function updateNotes() {
+
+		if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
+
+			dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
+
+		}
+
+	}
+
+	/**
+	 * Updates the visibility of the speaker notes sidebar that
+	 * is used to share annotated slides. The notes sidebar is
+	 * only visible if showNotes is true and there are notes on
+	 * one or more slides in the deck.
+	 */
+	function updateNotesVisibility() {
+
+		if( config.showNotes && hasNotes() ) {
+			dom.wrapper.classList.add( 'show-notes' );
+		}
+		else {
+			dom.wrapper.classList.remove( 'show-notes' );
+		}
+
+	}
+
+	/**
+	 * Checks if there are speaker notes for ANY slide in the
+	 * presentation.
+	 */
+	function hasNotes() {
+
+		return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
+
+	}
+
+	/**
+	 * Updates the progress bar to reflect the current slide.
+	 */
+	function updateProgress() {
+
+		// Update progress if enabled
+		if( config.progress && dom.progressbar ) {
+
+			dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
+
+		}
+
+	}
+
+
+	/**
+	 * Updates the slide number to match the current slide.
+	 */
+	function updateSlideNumber() {
+
+		// Update slide number if enabled
+		if( config.slideNumber && dom.slideNumber ) {
+			dom.slideNumber.innerHTML = getSlideNumber();
+		}
+
+	}
+
+	/**
+	 * Returns the HTML string corresponding to the current slide number,
+	 * including formatting.
+	 */
+	function getSlideNumber( slide ) {
+
+		var value;
+		var format = 'h.v';
+		if( slide === undefined ) {
+			slide = currentSlide;
+		}
+
+		if ( typeof config.slideNumber === 'function' ) {
+			value = config.slideNumber( slide );
+		} else {
+			// Check if a custom number format is available
+			if( typeof config.slideNumber === 'string' ) {
+				format = config.slideNumber;
+			}
+
+			// If there are ONLY vertical slides in this deck, always use
+			// a flattened slide number
+			if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
+				format = 'c';
+			}
+
+			value = [];
+			switch( format ) {
+				case 'c':
+					value.push( getSlidePastCount( slide ) + 1 );
+					break;
+				case 'c/t':
+					value.push( getSlidePastCount( slide ) + 1, '/', getTotalSlides() );
+					break;
+				default:
+					var indices = getIndices( slide );
+					value.push( indices.h + 1 );
+					var sep = format === 'h/v' ? '/' : '.';
+					if( isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
+			}
+		}
+
+		var url = '#' + locationHash( slide );
+		return formatSlideNumber( value[0], value[1], value[2], url );
+
+	}
+
+	/**
+	 * Applies HTML formatting to a slide number before it's
+	 * written to the DOM.
+	 *
+	 * @param {number} a Current slide
+	 * @param {string} delimiter Character to separate slide numbers
+	 * @param {(number|*)} b Total slides
+	 * @param {HTMLElement} [url='#'+locationHash()] The url to link to
+	 * @return {string} HTML string fragment
+	 */
+	function formatSlideNumber( a, delimiter, b, url ) {
+
+		if( url === undefined ) {
+			url = '#' + locationHash();
+		}
+		if( typeof b === 'number' && !isNaN( b ) ) {
+			return  '<a href="' + url + '">' +
+					'<span class="slide-number-a">'+ a +'</span>' +
+					'<span class="slide-number-delimiter">'+ delimiter +'</span>' +
+					'<span class="slide-number-b">'+ b +'</span>' +
+					'</a>';
+		}
+		else {
+			return '<a href="' + url + '">' +
+			       '<span class="slide-number-a">'+ a +'</span>' +
+			       '</a>';
+		}
+
+	}
+
+	/**
+	 * Updates the state of all control/navigation arrows.
+	 */
+	function updateControls() {
+
+		var routes = availableRoutes();
+		var fragments = availableFragments();
+
+		// Remove the 'enabled' class from all directions
+		dom.controlsLeft.concat( dom.controlsRight )
+						.concat( dom.controlsUp )
+						.concat( dom.controlsDown )
+						.concat( dom.controlsPrev )
+						.concat( dom.controlsNext ).forEach( function( node ) {
+			node.classList.remove( 'enabled' );
+			node.classList.remove( 'fragmented' );
+
+			// Set 'disabled' attribute on all directions
+			node.setAttribute( 'disabled', 'disabled' );
+		} );
+
+		// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
+		if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+		// Prev/next buttons
+		if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+		// Highlight fragment directions
+		if( currentSlide ) {
+
+			// Always apply fragment decorator to prev/next buttons
+			if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+			// Apply fragment decorators to directional buttons based on
+			// what slide axis they are in
+			if( isVerticalSlide( currentSlide ) ) {
+				if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+				if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			}
+			else {
+				if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+				if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			}
+
+		}
+
+		if( config.controlsTutorial ) {
+
+			// Highlight control arrows with an animation to ensure
+			// that the viewer knows how to navigate
+			if( !hasNavigatedDown && routes.down ) {
+				dom.controlsDownArrow.classList.add( 'highlight' );
+			}
+			else {
+				dom.controlsDownArrow.classList.remove( 'highlight' );
+
+				if( !hasNavigatedRight && routes.right && indexv === 0 ) {
+					dom.controlsRightArrow.classList.add( 'highlight' );
+				}
+				else {
+					dom.controlsRightArrow.classList.remove( 'highlight' );
+				}
+			}
+
+		}
+
+	}
+
+	/**
+	 * Updates the background elements to reflect the current
+	 * slide.
+	 *
+	 * @param {boolean} includeAll If true, the backgrounds of
+	 * all vertical slides (not just the present) will be updated.
+	 */
+	function updateBackground( includeAll ) {
+
+		var currentBackground = null;
+
+		// Reverse past/future classes when in RTL mode
+		var horizontalPast = config.rtl ? 'future' : 'past',
+			horizontalFuture = config.rtl ? 'past' : 'future';
+
+		// Update the classes of all backgrounds to match the
+		// states of their slides (past/present/future)
+		toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
+
+			backgroundh.classList.remove( 'past' );
+			backgroundh.classList.remove( 'present' );
+			backgroundh.classList.remove( 'future' );
+
+			if( h < indexh ) {
+				backgroundh.classList.add( horizontalPast );
+			}
+			else if ( h > indexh ) {
+				backgroundh.classList.add( horizontalFuture );
+			}
+			else {
+				backgroundh.classList.add( 'present' );
+
+				// Store a reference to the current background element
+				currentBackground = backgroundh;
+			}
+
+			if( includeAll || h === indexh ) {
+				toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
+
+					backgroundv.classList.remove( 'past' );
+					backgroundv.classList.remove( 'present' );
+					backgroundv.classList.remove( 'future' );
+
+					if( v < indexv ) {
+						backgroundv.classList.add( 'past' );
+					}
+					else if ( v > indexv ) {
+						backgroundv.classList.add( 'future' );
+					}
+					else {
+						backgroundv.classList.add( 'present' );
+
+						// Only if this is the present horizontal and vertical slide
+						if( h === indexh ) currentBackground = backgroundv;
+					}
+
+				} );
+			}
+
+		} );
+
+		// Stop content inside of previous backgrounds
+		if( previousBackground ) {
+
+			stopEmbeddedContent( previousBackground, { unloadIframes: !shouldPreload( previousBackground ) } );
+
+		}
+
+		// Start content in the current background
+		if( currentBackground ) {
+
+			startEmbeddedContent( currentBackground );
+
+			var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
+			if( currentBackgroundContent ) {
+
+				var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
+
+				// Restart GIFs (doesn't work in Firefox)
+				if( /\.gif/i.test( backgroundImageURL ) ) {
+					currentBackgroundContent.style.backgroundImage = '';
+					window.getComputedStyle( currentBackgroundContent ).opacity;
+					currentBackgroundContent.style.backgroundImage = backgroundImageURL;
+				}
+
+			}
+
+			// Don't transition between identical backgrounds. This
+			// prevents unwanted flicker.
+			var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
+			var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
+			if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
+				dom.background.classList.add( 'no-transition' );
+			}
+
+			previousBackground = currentBackground;
+
+		}
+
+		// If there's a background brightness flag for this slide,
+		// bubble it to the .reveal container
+		if( currentSlide ) {
+			[ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
+				if( currentSlide.classList.contains( classToBubble ) ) {
+					dom.wrapper.classList.add( classToBubble );
+				}
+				else {
+					dom.wrapper.classList.remove( classToBubble );
+				}
+			} );
+		}
+
+		// Allow the first background to apply without transition
+		setTimeout( function() {
+			dom.background.classList.remove( 'no-transition' );
+		}, 1 );
+
+	}
+
+	/**
+	 * Updates the position of the parallax background based
+	 * on the current slide index.
+	 */
+	function updateParallax() {
+
+		if( config.parallaxBackgroundImage ) {
+
+			var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
+				verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
+
+			var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
+				backgroundWidth, backgroundHeight;
+
+			if( backgroundSize.length === 1 ) {
+				backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
+			}
+			else {
+				backgroundWidth = parseInt( backgroundSize[0], 10 );
+				backgroundHeight = parseInt( backgroundSize[1], 10 );
+			}
+
+			var slideWidth = dom.background.offsetWidth,
+				horizontalSlideCount = horizontalSlides.length,
+				horizontalOffsetMultiplier,
+				horizontalOffset;
+
+			if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
+				horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
+			}
+			else {
+				horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
+			}
+
+			horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
+
+			var slideHeight = dom.background.offsetHeight,
+				verticalSlideCount = verticalSlides.length,
+				verticalOffsetMultiplier,
+				verticalOffset;
+
+			if( typeof config.parallaxBackgroundVertical === 'number' ) {
+				verticalOffsetMultiplier = config.parallaxBackgroundVertical;
+			}
+			else {
+				verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
+			}
+
+			verticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indexv : 0;
+
+			dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
+
+		}
+
+	}
+
+	/**
+	 * Should the given element be preloaded?
+	 * Decides based on local element attributes and global config.
+	 *
+	 * @param {HTMLElement} element
+	 */
+	function shouldPreload( element ) {
+
+		// Prefer an explicit global preload setting
+		var preload = config.preloadIframes;
+
+		// If no global setting is available, fall back on the element's
+		// own preload setting
+		if( typeof preload !== 'boolean' ) {
+			preload = element.hasAttribute( 'data-preload' );
+		}
+
+		return preload;
+	}
+
+	/**
+	 * Called when the given slide is within the configured view
+	 * distance. Shows the slide element and loads any content
+	 * that is set to load lazily (data-src).
+	 *
+	 * @param {HTMLElement} slide Slide to show
+	 */
+	function loadSlide( slide, options ) {
+
+		options = options || {};
+
+		// Show the slide element
+		slide.style.display = config.display;
+
+		// Media elements with data-src attributes
+		toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
+			if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
+				element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+				element.setAttribute( 'data-lazy-loaded', '' );
+				element.removeAttribute( 'data-src' );
+			}
+		} );
+
+		// Media elements with <source> children
+		toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
+			var sources = 0;
+
+			toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
+				source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
+				source.removeAttribute( 'data-src' );
+				source.setAttribute( 'data-lazy-loaded', '' );
+				sources += 1;
+			} );
+
+			// If we rewrote sources for this video/audio element, we need
+			// to manually tell it to load from its new origin
+			if( sources > 0 ) {
+				media.load();
+			}
+		} );
+
+
+		// Show the corresponding background element
+		var background = slide.slideBackgroundElement;
+		if( background ) {
+			background.style.display = 'block';
+
+			var backgroundContent = slide.slideBackgroundContentElement;
+			var backgroundIframe = slide.getAttribute( 'data-background-iframe' );
+
+			// If the background contains media, load it
+			if( background.hasAttribute( 'data-loaded' ) === false ) {
+				background.setAttribute( 'data-loaded', 'true' );
+
+				var backgroundImage = slide.getAttribute( 'data-background-image' ),
+					backgroundVideo = slide.getAttribute( 'data-background-video' ),
+					backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
+					backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
+
+				// Images
+				if( backgroundImage ) {
+					backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
+				}
+				// Videos
+				else if ( backgroundVideo && !isSpeakerNotes() ) {
+					var video = document.createElement( 'video' );
+
+					if( backgroundVideoLoop ) {
+						video.setAttribute( 'loop', '' );
+					}
+
+					if( backgroundVideoMuted ) {
+						video.muted = true;
+					}
+
+					// Inline video playback works (at least in Mobile Safari) as
+					// long as the video is muted and the `playsinline` attribute is
+					// present
+					if( isMobileDevice ) {
+						video.muted = true;
+						video.autoplay = true;
+						video.setAttribute( 'playsinline', '' );
+					}
+
+					// Support comma separated lists of video sources
+					backgroundVideo.split( ',' ).forEach( function( source ) {
+						video.innerHTML += '<source src="'+ source +'">';
+					} );
+
+					backgroundContent.appendChild( video );
+				}
+				// Iframes
+				else if( backgroundIframe && options.excludeIframes !== true ) {
+					var iframe = document.createElement( 'iframe' );
+					iframe.setAttribute( 'allowfullscreen', '' );
+					iframe.setAttribute( 'mozallowfullscreen', '' );
+					iframe.setAttribute( 'webkitallowfullscreen', '' );
+					iframe.setAttribute( 'allow', 'autoplay' );
+
+					iframe.setAttribute( 'data-src', backgroundIframe );
+
+					iframe.style.width  = '100%';
+					iframe.style.height = '100%';
+					iframe.style.maxHeight = '100%';
+					iframe.style.maxWidth = '100%';
+
+					backgroundContent.appendChild( iframe );
+				}
+			}
+
+			// Start loading preloadable iframes
+			var backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
+			if( backgroundIframeElement ) {
+
+				// Check if this iframe is eligible to be preloaded
+				if( shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
+					if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
+						backgroundIframeElement.setAttribute( 'src', backgroundIframe );
+					}
+				}
+
+			}
+
+		}
+
+	}
+
+	/**
+	 * Unloads and hides the given slide. This is called when the
+	 * slide is moved outside of the configured view distance.
+	 *
+	 * @param {HTMLElement} slide
+	 */
+	function unloadSlide( slide ) {
+
+		// Hide the slide element
+		slide.style.display = 'none';
+
+		// Hide the corresponding background element
+		var background = getSlideBackground( slide );
+		if( background ) {
+			background.style.display = 'none';
+
+			// Unload any background iframes
+			toArray( background.querySelectorAll( 'iframe[src]' ) ).forEach( function( element ) {
+				element.removeAttribute( 'src' );
+			} );
+		}
+
+		// Reset lazy-loaded media elements with src attributes
+		toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
+			element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
+			element.removeAttribute( 'src' );
+		} );
+
+		// Reset lazy-loaded media elements with <source> children
+		toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
+			source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
+			source.removeAttribute( 'src' );
+		} );
+
+	}
+
+	/**
+	 * Determine what available routes there are for navigation.
+	 *
+	 * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
+	 */
+	function availableRoutes() {
+
+		var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
+			verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
+
+		var routes = {
+			left: indexh > 0,
+			right: indexh < horizontalSlides.length - 1,
+			up: indexv > 0,
+			down: indexv < verticalSlides.length - 1
+		};
+
+		// Looped presentations can always be navigated as long as
+		// there are slides available
+		if( config.loop ) {
+			if( horizontalSlides.length > 1 ) {
+				routes.left = true;
+				routes.right = true;
+			}
+
+			if( verticalSlides.length > 1 ) {
+				routes.up = true;
+				routes.down = true;
+			}
+		}
+
+		// Reverse horizontal controls for rtl
+		if( config.rtl ) {
+			var left = routes.left;
+			routes.left = routes.right;
+			routes.right = left;
+		}
+
+		return routes;
+
+	}
+
+	/**
+	 * Returns an object describing the available fragment
+	 * directions.
+	 *
+	 * @return {{prev: boolean, next: boolean}}
+	 */
+	function availableFragments() {
+
+		if( currentSlide && config.fragments ) {
+			var fragments = currentSlide.querySelectorAll( '.fragment' );
+			var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
+
+			return {
+				prev: fragments.length - hiddenFragments.length > 0,
+				next: !!hiddenFragments.length
+			};
+		}
+		else {
+			return { prev: false, next: false };
+		}
+
+	}
+
+	/**
+	 * Enforces origin-specific format rules for embedded media.
+	 */
+	function formatEmbeddedContent() {
+
+		var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
+			toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
+				var src = el.getAttribute( sourceAttribute );
+				if( src && src.indexOf( param ) === -1 ) {
+					el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
+				}
+			});
+		};
+
+		// YouTube frames must include "?enablejsapi=1"
+		_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
+		_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
+
+		// Vimeo frames must include "?api=1"
+		_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
+		_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
+
+	}
+
+	/**
+	 * Start playback of any embedded content inside of
+	 * the given element.
+	 *
+	 * @param {HTMLElement} element
+	 */
+	function startEmbeddedContent( element ) {
+
+		if( element && !isSpeakerNotes() ) {
+
+			// Restart GIFs
+			toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
+				// Setting the same unchanged source like this was confirmed
+				// to work in Chrome, FF & Safari
+				el.setAttribute( 'src', el.getAttribute( 'src' ) );
+			} );
+
+			// HTML5 media elements
+			toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				// Prefer an explicit global autoplay setting
+				var autoplay = config.autoPlayMedia;
+
+				// If no global setting is available, fall back on the element's
+				// own autoplay setting
+				if( typeof autoplay !== 'boolean' ) {
+					autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
+				}
+
+				if( autoplay && typeof el.play === 'function' ) {
+
+					// If the media is ready, start playback
+					if( el.readyState > 1 ) {
+						startEmbeddedMedia( { target: el } );
+					}
+					// Mobile devices never fire a loaded event so instead
+					// of waiting, we initiate playback
+					else if( isMobileDevice ) {
+						var promise = el.play();
+
+						// If autoplay does not work, ensure that the controls are visible so
+						// that the viewer can start the media on their own
+						if( promise && typeof promise.catch === 'function' && el.controls === false ) {
+							promise.catch( function() {
+								el.controls = true;
+
+								// Once the video does start playing, hide the controls again
+								el.addEventListener( 'play', function() {
+									el.controls = false;
+								} );
+							} );
+						}
+					}
+					// If the media isn't loaded, wait before playing
+					else {
+						el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
+						el.addEventListener( 'loadeddata', startEmbeddedMedia );
+					}
+
+				}
+			} );
+
+			// Normal iframes
+			toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				startEmbeddedIframe( { target: el } );
+			} );
+
+			// Lazy loading iframes
+			toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
+					el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
+					el.addEventListener( 'load', startEmbeddedIframe );
+					el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
+				}
+			} );
+
+		}
+
+	}
+
+	/**
+	 * Starts playing an embedded video/audio element after
+	 * it has finished loading.
+	 *
+	 * @param {object} event
+	 */
+	function startEmbeddedMedia( event ) {
+
+		var isAttachedToDOM = !!closestParent( event.target, 'html' ),
+			isVisible  		= !!closestParent( event.target, '.present' );
+
+		if( isAttachedToDOM && isVisible ) {
+			event.target.currentTime = 0;
+			event.target.play();
+		}
+
+		event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
+
+	}
+
+	/**
+	 * "Starts" the content of an embedded iframe using the
+	 * postMessage API.
+	 *
+	 * @param {object} event
+	 */
+	function startEmbeddedIframe( event ) {
+
+		var iframe = event.target;
+
+		if( iframe && iframe.contentWindow ) {
+
+			var isAttachedToDOM = !!closestParent( event.target, 'html' ),
+				isVisible  		= !!closestParent( event.target, '.present' );
+
+			if( isAttachedToDOM && isVisible ) {
+
+				// Prefer an explicit global autoplay setting
+				var autoplay = config.autoPlayMedia;
+
+				// If no global setting is available, fall back on the element's
+				// own autoplay setting
+				if( typeof autoplay !== 'boolean' ) {
+					autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
+				}
+
+				// YouTube postMessage API
+				if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
+					iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
+				}
+				// Vimeo postMessage API
+				else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
+					iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
+				}
+				// Generic postMessage API
+				else {
+					iframe.contentWindow.postMessage( 'slide:start', '*' );
+				}
+
+			}
+
+		}
+
+	}
+
+	/**
+	 * Stop playback of any embedded content inside of
+	 * the targeted slide.
+	 *
+	 * @param {HTMLElement} element
+	 */
+	function stopEmbeddedContent( element, options ) {
+
+		options = extend( {
+			// Defaults
+			unloadIframes: true
+		}, options || {} );
+
+		if( element && element.parentNode ) {
+			// HTML5 media elements
+			toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
+				if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
+					el.setAttribute('data-paused-by-reveal', '');
+					el.pause();
+				}
+			} );
+
+			// Generic postMessage API for non-lazy loaded iframes
+			toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
+				if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
+				el.removeEventListener( 'load', startEmbeddedIframe );
+			});
+
+			// YouTube postMessage API
+			toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
+				if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
+					el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
+				}
+			});
+
+			// Vimeo postMessage API
+			toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
+				if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
+					el.contentWindow.postMessage( '{"method":"pause"}', '*' );
+				}
+			});
+
+			if( options.unloadIframes === true ) {
+				// Unload lazy-loaded iframes
+				toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
+					// Only removing the src doesn't actually unload the frame
+					// in all browsers (Firefox) so we set it to blank first
+					el.setAttribute( 'src', 'about:blank' );
+					el.removeAttribute( 'src' );
+				} );
+			}
+		}
+
+	}
+
+	/**
+	 * Returns the number of past slides. This can be used as a global
+	 * flattened index for slides.
+	 *
+	 * @param {HTMLElement} [slide=currentSlide] The slide we're counting before
+	 *
+	 * @return {number} Past slide count
+	 */
+	function getSlidePastCount( slide ) {
+
+		if( slide === undefined ) {
+			slide = currentSlide;
+		}
+
+		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+
+		// The number of past slides
+		var pastCount = 0;
+
+		// Step through all slides and count the past ones
+		mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
+
+			var horizontalSlide = horizontalSlides[i];
+			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
+
+			for( var j = 0; j < verticalSlides.length; j++ ) {
+
+				// Stop as soon as we arrive at the present
+				if( verticalSlides[j] === slide ) {
+					break mainLoop;
+				}
+
+				pastCount++;
+
+			}
+
+			// Stop as soon as we arrive at the present
+			if( horizontalSlide === slide ) {
+				break;
+			}
+
+			// Don't count the wrapping section for vertical slides
+			if( horizontalSlide.classList.contains( 'stack' ) === false ) {
+				pastCount++;
+			}
+
+		}
+
+		return pastCount;
+
+	}
+
+	/**
+	 * Returns a value ranging from 0-1 that represents
+	 * how far into the presentation we have navigated.
+	 *
+	 * @return {number}
+	 */
+	function getProgress() {
+
+		// The number of past and total slides
+		var totalCount = getTotalSlides();
+		var pastCount = getSlidePastCount();
+
+		if( currentSlide ) {
+
+			var allFragments = currentSlide.querySelectorAll( '.fragment' );
+
+			// If there are fragments in the current slide those should be
+			// accounted for in the progress.
+			if( allFragments.length > 0 ) {
+				var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
+
+				// This value represents how big a portion of the slide progress
+				// that is made up by its fragments (0-1)
+				var fragmentWeight = 0.9;
+
+				// Add fragment progress to the past slide count
+				pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
+			}
+
+		}
+
+		return Math.min( pastCount / ( totalCount - 1 ), 1 );
+
+	}
+
+	/**
+	 * Checks if this presentation is running inside of the
+	 * speaker notes window.
+	 *
+	 * @return {boolean}
+	 */
+	function isSpeakerNotes() {
+
+		return !!window.location.search.match( /receiver/gi );
+
+	}
+
+	/**
+	 * Reads the current URL (hash) and navigates accordingly.
+	 */
+	function readURL() {
+
+		var hash = window.location.hash;
+
+		// Attempt to parse the hash as either an index or name
+		var bits = hash.slice( 2 ).split( '/' ),
+			name = hash.replace( /#|\//gi, '' );
+
+		// If the first bit is not fully numeric and there is a name we
+		// can assume that this is a named link
+		if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
+			var element;
+
+			// Ensure the named link is a valid HTML ID attribute
+			try {
+				element = document.getElementById( decodeURIComponent( name ) );
+			}
+			catch ( error ) { }
+
+			// Ensure that we're not already on a slide with the same name
+			var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
+
+			if( element ) {
+				// If the slide exists and is not the current slide...
+				if ( !isSameNameAsCurrentSlide ) {
+					// ...find the position of the named slide and navigate to it
+					var indices = Reveal.getIndices(element);
+					slide(indices.h, indices.v);
+				}
+			}
+			// If the slide doesn't exist, navigate to the current slide
+			else {
+				slide( indexh || 0, indexv || 0 );
+			}
+		}
+		else {
+			var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+
+			// Read the index components of the hash
+			var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
+				v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
+				f;
+
+			if( config.fragmentInURL ) {
+				f = parseInt( bits[2], 10 );
+				if( isNaN( f ) ) {
+					f = undefined;
+				}
+			}
+
+			if( h !== indexh || v !== indexv || f !== undefined ) {
+				slide( h, v, f );
+			}
+		}
+
+	}
+
+	/**
+	 * Updates the page URL (hash) to reflect the current
+	 * state.
+	 *
+	 * @param {number} delay The time in ms to wait before
+	 * writing the hash
+	 */
+	function writeURL( delay ) {
+
+		// Make sure there's never more than one timeout running
+		clearTimeout( writeURLTimeout );
+
+		// If a delay is specified, timeout this call
+		if( typeof delay === 'number' ) {
+			writeURLTimeout = setTimeout( writeURL, delay );
+		}
+		else if( currentSlide ) {
+			// If we're configured to push to history OR the history
+			// API is not avaialble.
+			if( config.history || !window.history ) {
+				window.location.hash = locationHash();
+			}
+			// If we're configured to reflect the current slide in the
+			// URL without pushing to history.
+			else if( config.hash ) {
+				window.history.replaceState( null, null, '#' + locationHash() );
+			}
+			// If history and hash are both disabled, a hash may still
+			// be added to the URL by clicking on a href with a hash
+			// target. Counter this by always removing the hash.
+			else {
+				window.history.replaceState( null, null, window.location.pathname + window.location.search );
+			}
+		}
+
+	}
+	/**
+	 * Retrieves the h/v location and fragment of the current,
+	 * or specified, slide.
+	 *
+	 * @param {HTMLElement} [slide] If specified, the returned
+	 * index will be for this slide rather than the currently
+	 * active one
+	 *
+	 * @return {{h: number, v: number, f: number}}
+	 */
+	function getIndices( slide ) {
+
+		// By default, return the current indices
+		var h = indexh,
+			v = indexv,
+			f;
+
+		// If a slide is specified, return the indices of that slide
+		if( slide ) {
+			var isVertical = isVerticalSlide( slide );
+			var slideh = isVertical ? slide.parentNode : slide;
+
+			// Select all horizontal slides
+			var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+
+			// Now that we know which the horizontal slide is, get its index
+			h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
+
+			// Assume we're not vertical
+			v = undefined;
+
+			// If this is a vertical slide, grab the vertical index
+			if( isVertical ) {
+				v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
+			}
+		}
+
+		if( !slide && currentSlide ) {
+			var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
+			if( hasFragments ) {
+				var currentFragment = currentSlide.querySelector( '.current-fragment' );
+				if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
+					f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
+				}
+				else {
+					f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
+				}
+			}
+		}
+
+		return { h: h, v: v, f: f };
+
+	}
+
+	/**
+	 * Retrieves all slides in this presentation.
+	 */
+	function getSlides() {
+
+		return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ) );
+
+	}
+
+	/**
+	 * Returns a list of all horizontal slides in the deck. Each
+	 * vertical stack is included as one horizontal slide in the
+	 * resulting array.
+	 */
+	function getHorizontalSlides() {
+
+		return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
+
+	}
+
+	/**
+	 * Returns all vertical slides that exist within this deck.
+	 */
+	function getVerticalSlides() {
+
+		return toArray( dom.wrapper.querySelectorAll( '.slides>section>section' ) );
+
+	}
+
+	/**
+	 * Returns true if there are at least two horizontal slides.
+	 */
+	function hasHorizontalSlides() {
+
+		return getHorizontalSlides().length > 1;
+	}
+
+	/**
+	 * Returns true if there are at least two vertical slides.
+	 */
+	function hasVerticalSlides() {
+
+		return getVerticalSlides().length > 1;
+
+	}
+
+	/**
+	 * Returns an array of objects where each object represents the
+	 * attributes on its respective slide.
+	 */
+	function getSlidesAttributes() {
+
+		return getSlides().map( function( slide ) {
+
+			var attributes = {};
+			for( var i = 0; i < slide.attributes.length; i++ ) {
+				var attribute = slide.attributes[ i ];
+				attributes[ attribute.name ] = attribute.value;
+			}
+			return attributes;
+
+		} );
+
+	}
+
+	/**
+	 * Retrieves the total number of slides in this presentation.
+	 *
+	 * @return {number}
+	 */
+	function getTotalSlides() {
+
+		return getSlides().length;
+
+	}
+
+	/**
+	 * Returns the slide element matching the specified index.
+	 *
+	 * @return {HTMLElement}
+	 */
+	function getSlide( x, y ) {
+
+		var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
+		var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
+
+		if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
+			return verticalSlides ? verticalSlides[ y ] : undefined;
+		}
+
+		return horizontalSlide;
+
+	}
+
+	/**
+	 * Returns the background element for the given slide.
+	 * All slides, even the ones with no background properties
+	 * defined, have a background element so as long as the
+	 * index is valid an element will be returned.
+	 *
+	 * @param {mixed} x Horizontal background index OR a slide
+	 * HTML element
+	 * @param {number} y Vertical background index
+	 * @return {(HTMLElement[]|*)}
+	 */
+	function getSlideBackground( x, y ) {
+
+		var slide = typeof x === 'number' ? getSlide( x, y ) : x;
+		if( slide ) {
+			return slide.slideBackgroundElement;
+		}
+
+		return undefined;
+
+	}
+
+	/**
+	 * Retrieves the speaker notes from a slide. Notes can be
+	 * defined in two ways:
+	 * 1. As a data-notes attribute on the slide <section>
+	 * 2. As an <aside class="notes"> inside of the slide
+	 *
+	 * @param {HTMLElement} [slide=currentSlide]
+	 * @return {(string|null)}
+	 */
+	function getSlideNotes( slide ) {
+
+		// Default to the current slide
+		slide = slide || currentSlide;
+
+		// Notes can be specified via the data-notes attribute...
+		if( slide.hasAttribute( 'data-notes' ) ) {
+			return slide.getAttribute( 'data-notes' );
+		}
+
+		// ... or using an <aside class="notes"> element
+		var notesElement = slide.querySelector( 'aside.notes' );
+		if( notesElement ) {
+			return notesElement.innerHTML;
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * Retrieves the current state of the presentation as
+	 * an object. This state can then be restored at any
+	 * time.
+	 *
+	 * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
+	 */
+	function getState() {
+
+		var indices = getIndices();
+
+		return {
+			indexh: indices.h,
+			indexv: indices.v,
+			indexf: indices.f,
+			paused: isPaused(),
+			overview: isOverview()
+		};
+
+	}
+
+	/**
+	 * Restores the presentation to the given state.
+	 *
+	 * @param {object} state As generated by getState()
+	 * @see {@link getState} generates the parameter `state`
+	 */
+	function setState( state ) {
+
+		if( typeof state === 'object' ) {
+			slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
+
+			var pausedFlag = deserialize( state.paused ),
+				overviewFlag = deserialize( state.overview );
+
+			if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
+				togglePause( pausedFlag );
+			}
+
+			if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
+				toggleOverview( overviewFlag );
+			}
+		}
+
+	}
+
+	/**
+	 * Return a sorted fragments list, ordered by an increasing
+	 * "data-fragment-index" attribute.
+	 *
+	 * Fragments will be revealed in the order that they are returned by
+	 * this function, so you can use the index attributes to control the
+	 * order of fragment appearance.
+	 *
+	 * To maintain a sensible default fragment order, fragments are presumed
+	 * to be passed in document order. This function adds a "fragment-index"
+	 * attribute to each node if such an attribute is not already present,
+	 * and sets that attribute to an integer value which is the position of
+	 * the fragment within the fragments list.
+	 *
+	 * @param {object[]|*} fragments
+	 * @param {boolean} grouped If true the returned array will contain
+	 * nested arrays for all fragments with the same index
+	 * @return {object[]} sorted Sorted array of fragments
+	 */
+	function sortFragments( fragments, grouped ) {
+
+		fragments = toArray( fragments );
+
+		var ordered = [],
+			unordered = [],
+			sorted = [];
+
+		// Group ordered and unordered elements
+		fragments.forEach( function( fragment, i ) {
+			if( fragment.hasAttribute( 'data-fragment-index' ) ) {
+				var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
+
+				if( !ordered[index] ) {
+					ordered[index] = [];
+				}
+
+				ordered[index].push( fragment );
+			}
+			else {
+				unordered.push( [ fragment ] );
+			}
+		} );
+
+		// Append fragments without explicit indices in their
+		// DOM order
+		ordered = ordered.concat( unordered );
+
+		// Manually count the index up per group to ensure there
+		// are no gaps
+		var index = 0;
+
+		// Push all fragments in their sorted order to an array,
+		// this flattens the groups
+		ordered.forEach( function( group ) {
+			group.forEach( function( fragment ) {
+				sorted.push( fragment );
+				fragment.setAttribute( 'data-fragment-index', index );
+			} );
+
+			index ++;
+		} );
+
+		return grouped === true ? ordered : sorted;
+
+	}
+
+	/**
+	 * Refreshes the fragments on the current slide so that they
+	 * have the appropriate classes (.visible + .current-fragment).
+	 *
+	 * @param {number} [index] The index of the current fragment
+	 * @param {array} [fragments] Array containing all fragments
+	 * in the current slide
+	 *
+	 * @return {{shown: array, hidden: array}}
+	 */
+	function updateFragments( index, fragments ) {
+
+		var changedFragments = {
+			shown: [],
+			hidden: []
+		};
+
+		if( currentSlide && config.fragments ) {
+
+			fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
+
+			if( fragments.length ) {
+
+				var maxIndex = 0;
+
+				if( typeof index !== 'number' ) {
+					var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
+					if( currentFragment ) {
+						index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+					}
+				}
+
+				toArray( fragments ).forEach( function( el, i ) {
+
+					if( el.hasAttribute( 'data-fragment-index' ) ) {
+						i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
+					}
+
+					maxIndex = Math.max( maxIndex, i );
+
+					// Visible fragments
+					if( i <= index ) {
+						if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
+						el.classList.add( 'visible' );
+						el.classList.remove( 'current-fragment' );
+
+						// Announce the fragments one by one to the Screen Reader
+						dom.statusDiv.textContent = getStatusText( el );
+
+						if( i === index ) {
+							el.classList.add( 'current-fragment' );
+							startEmbeddedContent( el );
+						}
+					}
+					// Hidden fragments
+					else {
+						if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
+						el.classList.remove( 'visible' );
+						el.classList.remove( 'current-fragment' );
+					}
+
+				} );
+
+				// Write the current fragment index to the slide <section>.
+				// This can be used by end users to apply styles based on
+				// the current fragment index.
+				index = typeof index === 'number' ? index : -1;
+				index = Math.max( Math.min( index, maxIndex ), -1 );
+				currentSlide.setAttribute( 'data-fragment', index );
+
+			}
+
+		}
+
+		return changedFragments;
+
+	}
+
+	/**
+	 * Navigate to the specified slide fragment.
+	 *
+	 * @param {?number} index The index of the fragment that
+	 * should be shown, -1 means all are invisible
+	 * @param {number} offset Integer offset to apply to the
+	 * fragment index
+	 *
+	 * @return {boolean} true if a change was made in any
+	 * fragments visibility as part of this call
+	 */
+	function navigateFragment( index, offset ) {
+
+		if( currentSlide && config.fragments ) {
+
+			var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
+			if( fragments.length ) {
+
+				// If no index is specified, find the current
+				if( typeof index !== 'number' ) {
+					var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
+
+					if( lastVisibleFragment ) {
+						index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+					}
+					else {
+						index = -1;
+					}
+				}
+
+				// If an offset is specified, apply it to the index
+				if( typeof offset === 'number' ) {
+					index += offset;
+				}
+
+				var changedFragments = updateFragments( index, fragments );
+
+				if( changedFragments.hidden.length ) {
+					dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
+				}
+
+				if( changedFragments.shown.length ) {
+					dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
+				}
+
+				updateControls();
+				updateProgress();
+
+				if( config.fragmentInURL ) {
+					writeURL();
+				}
+
+				return !!( changedFragments.shown.length || changedFragments.hidden.length );
+
+			}
+
+		}
+
+		return false;
+
+	}
+
+	/**
+	 * Navigate to the next slide fragment.
+	 *
+	 * @return {boolean} true if there was a next fragment,
+	 * false otherwise
+	 */
+	function nextFragment() {
+
+		return navigateFragment( null, 1 );
+
+	}
+
+	/**
+	 * Navigate to the previous slide fragment.
+	 *
+	 * @return {boolean} true if there was a previous fragment,
+	 * false otherwise
+	 */
+	function previousFragment() {
+
+		return navigateFragment( null, -1 );
+
+	}
+
+	/**
+	 * Cues a new automated slide if enabled in the config.
+	 */
+	function cueAutoSlide() {
+
+		cancelAutoSlide();
+
+		if( currentSlide && config.autoSlide !== false ) {
+
+			var fragment = currentSlide.querySelector( '.current-fragment' );
+
+			// When the slide first appears there is no "current" fragment so
+			// we look for a data-autoslide timing on the first fragment
+			if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
+
+			var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
+			var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
+			var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
+
+			// Pick value in the following priority order:
+			// 1. Current fragment's data-autoslide
+			// 2. Current slide's data-autoslide
+			// 3. Parent slide's data-autoslide
+			// 4. Global autoSlide setting
+			if( fragmentAutoSlide ) {
+				autoSlide = parseInt( fragmentAutoSlide, 10 );
+			}
+			else if( slideAutoSlide ) {
+				autoSlide = parseInt( slideAutoSlide, 10 );
+			}
+			else if( parentAutoSlide ) {
+				autoSlide = parseInt( parentAutoSlide, 10 );
+			}
+			else {
+				autoSlide = config.autoSlide;
+			}
+
+			// If there are media elements with data-autoplay,
+			// automatically set the autoSlide duration to the
+			// length of that media. Not applicable if the slide
+			// is divided up into fragments.
+			// playbackRate is accounted for in the duration.
+			if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
+				toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
+					if( el.hasAttribute( 'data-autoplay' ) ) {
+						if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
+							autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
+						}
+					}
+				} );
+			}
+
+			// Cue the next auto-slide if:
+			// - There is an autoSlide value
+			// - Auto-sliding isn't paused by the user
+			// - The presentation isn't paused
+			// - The overview isn't active
+			// - The presentation isn't over
+			if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
+				autoSlideTimeout = setTimeout( function() {
+					typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
+					cueAutoSlide();
+				}, autoSlide );
+				autoSlideStartTime = Date.now();
+			}
+
+			if( autoSlidePlayer ) {
+				autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
+			}
+
+		}
+
+	}
+
+	/**
+	 * Cancels any ongoing request to auto-slide.
+	 */
+	function cancelAutoSlide() {
+
+		clearTimeout( autoSlideTimeout );
+		autoSlideTimeout = -1;
+
+	}
+
+	function pauseAutoSlide() {
+
+		if( autoSlide && !autoSlidePaused ) {
+			autoSlidePaused = true;
+			dispatchEvent( 'autoslidepaused' );
+			clearTimeout( autoSlideTimeout );
+
+			if( autoSlidePlayer ) {
+				autoSlidePlayer.setPlaying( false );
+			}
+		}
+
+	}
+
+	function resumeAutoSlide() {
+
+		if( autoSlide && autoSlidePaused ) {
+			autoSlidePaused = false;
+			dispatchEvent( 'autoslideresumed' );
+			cueAutoSlide();
+		}
+
+	}
+
+	function navigateLeft() {
+
+		// Reverse for RTL
+		if( config.rtl ) {
+			if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
+				slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
+			}
+		}
+		// Normal navigation
+		else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
+			slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
+		}
+
+	}
+
+	function navigateRight() {
+
+		hasNavigatedRight = true;
+
+		// Reverse for RTL
+		if( config.rtl ) {
+			if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
+				slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
+			}
+		}
+		// Normal navigation
+		else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
+			slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
+		}
+
+	}
+
+	function navigateUp() {
+
+		// Prioritize hiding fragments
+		if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
+			slide( indexh, indexv - 1 );
+		}
+
+	}
+
+	function navigateDown() {
+
+		hasNavigatedDown = true;
+
+		// Prioritize revealing fragments
+		if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
+			slide( indexh, indexv + 1 );
+		}
+
+	}
+
+	/**
+	 * Navigates backwards, prioritized in the following order:
+	 * 1) Previous fragment
+	 * 2) Previous vertical slide
+	 * 3) Previous horizontal slide
+	 */
+	function navigatePrev() {
+
+		// Prioritize revealing fragments
+		if( previousFragment() === false ) {
+			if( availableRoutes().up ) {
+				navigateUp();
+			}
+			else {
+				// Fetch the previous horizontal slide, if there is one
+				var previousSlide;
+
+				if( config.rtl ) {
+					previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
+				}
+				else {
+					previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
+				}
+
+				if( previousSlide ) {
+					var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
+					var h = indexh - 1;
+					slide( h, v );
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * The reverse of #navigatePrev().
+	 */
+	function navigateNext() {
+
+		hasNavigatedRight = true;
+		hasNavigatedDown = true;
+
+		// Prioritize revealing fragments
+		if( nextFragment() === false ) {
+
+			var routes = availableRoutes();
+
+			// When looping is enabled `routes.down` is always available
+			// so we need a separate check for when we've reached the
+			// end of a stack and should move horizontally
+			if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
+				routes.down = false;
+			}
+
+			if( routes.down ) {
+				navigateDown();
+			}
+			else if( config.rtl ) {
+				navigateLeft();
+			}
+			else {
+				navigateRight();
+			}
+		}
+
+	}
+
+	/**
+	 * Checks if the target element prevents the triggering of
+	 * swipe navigation.
+	 */
+	function isSwipePrevented( target ) {
+
+		while( target && typeof target.hasAttribute === 'function' ) {
+			if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
+			target = target.parentNode;
+		}
+
+		return false;
+
+	}
+
+
+	// --------------------------------------------------------------------//
+	// ----------------------------- EVENTS -------------------------------//
+	// --------------------------------------------------------------------//
+
+	/**
+	 * Called by all event handlers that are based on user
+	 * input.
+	 *
+	 * @param {object} [event]
+	 */
+	function onUserInput( event ) {
+
+		if( config.autoSlideStoppable ) {
+			pauseAutoSlide();
+		}
+
+	}
+
+	/**
+	 * Called whenever there is mouse input at the document level
+	 * to determine if the cursor is active or not.
+	 *
+	 * @param {object} event
+	 */
+	function onDocumentCursorActive( event ) {
+
+		showCursor();
+
+		clearTimeout( cursorInactiveTimeout );
+
+		cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
+
+	}
+
+	/**
+	 * Handler for the document level 'keypress' event.
+	 *
+	 * @param {object} event
+	 */
+	function onDocumentKeyPress( event ) {
+
+		// Check if the pressed key is question mark
+		if( event.shiftKey && event.charCode === 63 ) {
+			toggleHelp();
+		}
+
+	}
+
+	/**
+	 * Handler for the document level 'keydown' event.
+	 *
+	 * @param {object} event
+	 */
+	function onDocumentKeyDown( event ) {
+
+		// If there's a condition specified and it returns false,
+		// ignore this event
+		if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
+			return true;
+		}
+
+		// Shorthand
+		var keyCode = event.keyCode;
+
+		// Remember if auto-sliding was paused so we can toggle it
+		var autoSlideWasPaused = autoSlidePaused;
+
+		onUserInput( event );
+
+		// Is there a focused element that could be using the keyboard?
+		var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
+		var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
+		var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
+
+		// Whitelist specific modified + keycode combinations
+		var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
+		var firstSlideShortcut = event.shiftKey && keyCode === 37;
+		var lastSlideShortcut = event.shiftKey && keyCode === 39;
+
+		// Prevent all other events when a modifier is pressed
+		var unusedModifier = 	!prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
+								( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
+
+		// Disregard the event if there's a focused element or a
+		// keyboard modifier key is present
+		if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
+
+		// While paused only allow resume keyboard events; 'b', 'v', '.'
+		var resumeKeyCodes = [66,86,190,191];
+		var key;
+
+		// Custom key bindings for togglePause should be able to resume
+		if( typeof config.keyboard === 'object' ) {
+			for( key in config.keyboard ) {
+				if( config.keyboard[key] === 'togglePause' ) {
+					resumeKeyCodes.push( parseInt( key, 10 ) );
+				}
+			}
+		}
+
+		if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
+			return false;
+		}
+
+		// Use linear navigation if we're configured to OR if
+		// the presentation is one-dimensional
+		var useLinearMode = config.navigationMode === 'linear' || !hasHorizontalSlides() || !hasVerticalSlides();
+
+		var triggered = false;
+
+		// 1. User defined key bindings
+		if( typeof config.keyboard === 'object' ) {
+
+			for( key in config.keyboard ) {
+
+				// Check if this binding matches the pressed key
+				if( parseInt( key, 10 ) === keyCode ) {
+
+					var value = config.keyboard[ key ];
+
+					// Callback function
+					if( typeof value === 'function' ) {
+						value.apply( null, [ event ] );
+					}
+					// String shortcuts to reveal.js API
+					else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
+						Reveal[ value ].call();
+					}
+
+					triggered = true;
+
+				}
+
+			}
+
+		}
+
+		// 2. Registered custom key bindings
+		if( triggered === false ) {
+
+			for( key in registeredKeyBindings ) {
+
+				// Check if this binding matches the pressed key
+				if( parseInt( key, 10 ) === keyCode ) {
+
+					var action = registeredKeyBindings[ key ].callback;
+
+					// Callback function
+					if( typeof action === 'function' ) {
+						action.apply( null, [ event ] );
+					}
+					// String shortcuts to reveal.js API
+					else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
+						Reveal[ action ].call();
+					}
+
+					triggered = true;
+				}
+			}
+		}
+
+		// 3. System defined key bindings
+		if( triggered === false ) {
+
+			// Assume true and try to prove false
+			triggered = true;
+
+			// P, PAGE UP
+			if( keyCode === 80 || keyCode === 33 ) {
+				navigatePrev();
+			}
+			// N, PAGE DOWN
+			else if( keyCode === 78 || keyCode === 34 ) {
+				navigateNext();
+			}
+			// H, LEFT
+			else if( keyCode === 72 || keyCode === 37 ) {
+				if( firstSlideShortcut ) {
+					slide( 0 );
+				}
+				else if( !isOverview() && useLinearMode ) {
+					navigatePrev();
+				}
+				else {
+					navigateLeft();
+				}
+			}
+			// L, RIGHT
+			else if( keyCode === 76 || keyCode === 39 ) {
+				if( lastSlideShortcut ) {
+					slide( Number.MAX_VALUE );
+				}
+				else if( !isOverview() && useLinearMode ) {
+					navigateNext();
+				}
+				else {
+					navigateRight();
+				}
+			}
+			// K, UP
+			else if( keyCode === 75 || keyCode === 38 ) {
+				if( !isOverview() && useLinearMode ) {
+					navigatePrev();
+				}
+				else {
+					navigateUp();
+				}
+			}
+			// J, DOWN
+			else if( keyCode === 74 || keyCode === 40 ) {
+				if( !isOverview() && useLinearMode ) {
+					navigateNext();
+				}
+				else {
+					navigateDown();
+				}
+			}
+			// HOME
+			else if( keyCode === 36 ) {
+				slide( 0 );
+			}
+			// END
+			else if( keyCode === 35 ) {
+				slide( Number.MAX_VALUE );
+			}
+			// SPACE
+			else if( keyCode === 32 ) {
+				if( isOverview() ) {
+					deactivateOverview();
+				}
+				if( event.shiftKey ) {
+					navigatePrev();
+				}
+				else {
+					navigateNext();
+				}
+			}
+			// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
+			else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
+				togglePause();
+			}
+			// F
+			else if( keyCode === 70 ) {
+				enterFullscreen();
+			}
+			// A
+			else if( keyCode === 65 ) {
+				if ( config.autoSlideStoppable ) {
+					toggleAutoSlide( autoSlideWasPaused );
+				}
+			}
+			else {
+				triggered = false;
+			}
+
+		}
+
+		// If the input resulted in a triggered action we should prevent
+		// the browsers default behavior
+		if( triggered ) {
+			event.preventDefault && event.preventDefault();
+		}
+		// ESC or O key
+		else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
+			if( dom.overlay ) {
+				closeOverlay();
+			}
+			else {
+				toggleOverview();
+			}
+
+			event.preventDefault && event.preventDefault();
+		}
+
+		// If auto-sliding is enabled we need to cue up
+		// another timeout
+		cueAutoSlide();
+
+	}
+
+	/**
+	 * Handler for the 'touchstart' event, enables support for
+	 * swipe and pinch gestures.
+	 *
+	 * @param {object} event
+	 */
+	function onTouchStart( event ) {
+
+		if( isSwipePrevented( event.target ) ) return true;
+
+		touch.startX = event.touches[0].clientX;
+		touch.startY = event.touches[0].clientY;
+		touch.startCount = event.touches.length;
+
+	}
+
+	/**
+	 * Handler for the 'touchmove' event.
+	 *
+	 * @param {object} event
+	 */
+	function onTouchMove( event ) {
+
+		if( isSwipePrevented( event.target ) ) return true;
+
+		// Each touch should only trigger one action
+		if( !touch.captured ) {
+			onUserInput( event );
+
+			var currentX = event.touches[0].clientX;
+			var currentY = event.touches[0].clientY;
+
+			// There was only one touch point, look for a swipe
+			if( event.touches.length === 1 && touch.startCount !== 2 ) {
+
+				var deltaX = currentX - touch.startX,
+					deltaY = currentY - touch.startY;
+
+				if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+					touch.captured = true;
+					if( config.navigationMode === 'linear' ) {
+						if( config.rtl ) {
+							navigateNext();
+						}
+						else {
+							navigatePrev();
+						}
+					}
+					else {
+						navigateLeft();
+					}
+				}
+				else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+					touch.captured = true;
+					if( config.navigationMode === 'linear' ) {
+						if( config.rtl ) {
+							navigatePrev();
+						}
+						else {
+							navigateNext();
+						}
+					}
+					else {
+						navigateRight();
+					}
+				}
+				else if( deltaY > touch.threshold ) {
+					touch.captured = true;
+					if( config.navigationMode === 'linear' ) {
+						navigatePrev();
+					}
+					else {
+						navigateUp();
+					}
+				}
+				else if( deltaY < -touch.threshold ) {
+					touch.captured = true;
+					if( config.navigationMode === 'linear' ) {
+						navigateNext();
+					}
+					else {
+						navigateDown();
+					}
+				}
+
+				// If we're embedded, only block touch events if they have
+				// triggered an action
+				if( config.embedded ) {
+					if( touch.captured || isVerticalSlide( currentSlide ) ) {
+						event.preventDefault();
+					}
+				}
+				// Not embedded? Block them all to avoid needless tossing
+				// around of the viewport in iOS
+				else {
+					event.preventDefault();
+				}
+
+			}
+		}
+		// There's a bug with swiping on some Android devices unless
+		// the default action is always prevented
+		else if( UA.match( /android/gi ) ) {
+			event.preventDefault();
+		}
+
+	}
+
+	/**
+	 * Handler for the 'touchend' event.
+	 *
+	 * @param {object} event
+	 */
+	function onTouchEnd( event ) {
+
+		touch.captured = false;
+
+	}
+
+	/**
+	 * Convert pointer down to touch start.
+	 *
+	 * @param {object} event
+	 */
+	function onPointerDown( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			onTouchStart( event );
+		}
+
+	}
+
+	/**
+	 * Convert pointer move to touch move.
+	 *
+	 * @param {object} event
+	 */
+	function onPointerMove( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			onTouchMove( event );
+		}
+
+	}
+
+	/**
+	 * Convert pointer up to touch end.
+	 *
+	 * @param {object} event
+	 */
+	function onPointerUp( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			onTouchEnd( event );
+		}
+
+	}
+
+	/**
+	 * Handles mouse wheel scrolling, throttled to avoid skipping
+	 * multiple slides.
+	 *
+	 * @param {object} event
+	 */
+	function onDocumentMouseScroll( event ) {
+
+		if( Date.now() - lastMouseWheelStep > 600 ) {
+
+			lastMouseWheelStep = Date.now();
+
+			var delta = event.detail || -event.wheelDelta;
+			if( delta > 0 ) {
+				navigateNext();
+			}
+			else if( delta < 0 ) {
+				navigatePrev();
+			}
+
+		}
+
+	}
+
+	/**
+	 * Clicking on the progress bar results in a navigation to the
+	 * closest approximate horizontal slide using this equation:
+	 *
+	 * ( clickX / presentationWidth ) * numberOfSlides
+	 *
+	 * @param {object} event
+	 */
+	function onProgressClicked( event ) {
+
+		onUserInput( event );
+
+		event.preventDefault();
+
+		var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
+		var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
+
+		if( config.rtl ) {
+			slideIndex = slidesTotal - slideIndex;
+		}
+
+		slide( slideIndex );
+
+	}
+
+	/**
+	 * Event handler for navigation control buttons.
+	 */
+	function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
+	function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
+	function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
+	function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
+	function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
+	function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
+
+	/**
+	 * Handler for the window level 'hashchange' event.
+	 *
+	 * @param {object} [event]
+	 */
+	function onWindowHashChange( event ) {
+
+		readURL();
+
+	}
+
+	/**
+	 * Handler for the window level 'resize' event.
+	 *
+	 * @param {object} [event]
+	 */
+	function onWindowResize( event ) {
+
+		layout();
+
+	}
+
+	/**
+	 * Handle for the window level 'visibilitychange' event.
+	 *
+	 * @param {object} [event]
+	 */
+	function onPageVisibilityChange( event ) {
+
+		var isHidden =  document.webkitHidden ||
+						document.msHidden ||
+						document.hidden;
+
+		// If, after clicking a link or similar and we're coming back,
+		// focus the document.body to ensure we can use keyboard shortcuts
+		if( isHidden === false && document.activeElement !== document.body ) {
+			// Not all elements support .blur() - SVGs among them.
+			if( typeof document.activeElement.blur === 'function' ) {
+				document.activeElement.blur();
+			}
+			document.body.focus();
+		}
+
+	}
+
+	/**
+	 * Invoked when a slide is and we're in the overview.
+	 *
+	 * @param {object} event
+	 */
+	function onOverviewSlideClicked( event ) {
+
+		// TODO There's a bug here where the event listeners are not
+		// removed after deactivating the overview.
+		if( eventsAreBound && isOverview() ) {
+			event.preventDefault();
+
+			var element = event.target;
+
+			while( element && !element.nodeName.match( /section/gi ) ) {
+				element = element.parentNode;
+			}
+
+			if( element && !element.classList.contains( 'disabled' ) ) {
+
+				deactivateOverview();
+
+				if( element.nodeName.match( /section/gi ) ) {
+					var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
+						v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
+
+					slide( h, v );
+				}
+
+			}
+		}
+
+	}
+
+	/**
+	 * Handles clicks on links that are set to preview in the
+	 * iframe overlay.
+	 *
+	 * @param {object} event
+	 */
+	function onPreviewLinkClicked( event ) {
+
+		if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
+			var url = event.currentTarget.getAttribute( 'href' );
+			if( url ) {
+				showPreview( url );
+				event.preventDefault();
+			}
+		}
+
+	}
+
+	/**
+	 * Handles click on the auto-sliding controls element.
+	 *
+	 * @param {object} [event]
+	 */
+	function onAutoSlidePlayerClick( event ) {
+
+		// Replay
+		if( Reveal.isLastSlide() && config.loop === false ) {
+			slide( 0, 0 );
+			resumeAutoSlide();
+		}
+		// Resume
+		else if( autoSlidePaused ) {
+			resumeAutoSlide();
+		}
+		// Pause
+		else {
+			pauseAutoSlide();
+		}
+
+	}
+
+
+	// --------------------------------------------------------------------//
+	// ------------------------ PLAYBACK COMPONENT ------------------------//
+	// --------------------------------------------------------------------//
+
+
+	/**
+	 * Constructor for the playback component, which displays
+	 * play/pause/progress controls.
+	 *
+	 * @param {HTMLElement} container The component will append
+	 * itself to this
+	 * @param {function} progressCheck A method which will be
+	 * called frequently to get the current progress on a range
+	 * of 0-1
+	 */
+	function Playback( container, progressCheck ) {
+
+		// Cosmetics
+		this.diameter = 100;
+		this.diameter2 = this.diameter/2;
+		this.thickness = 6;
+
+		// Flags if we are currently playing
+		this.playing = false;
+
+		// Current progress on a 0-1 range
+		this.progress = 0;
+
+		// Used to loop the animation smoothly
+		this.progressOffset = 1;
+
+		this.container = container;
+		this.progressCheck = progressCheck;
+
+		this.canvas = document.createElement( 'canvas' );
+		this.canvas.className = 'playback';
+		this.canvas.width = this.diameter;
+		this.canvas.height = this.diameter;
+		this.canvas.style.width = this.diameter2 + 'px';
+		this.canvas.style.height = this.diameter2 + 'px';
+		this.context = this.canvas.getContext( '2d' );
+
+		this.container.appendChild( this.canvas );
+
+		this.render();
+
+	}
+
+	/**
+	 * @param value
+	 */
+	Playback.prototype.setPlaying = function( value ) {
+
+		var wasPlaying = this.playing;
+
+		this.playing = value;
+
+		// Start repainting if we weren't already
+		if( !wasPlaying && this.playing ) {
+			this.animate();
+		}
+		else {
+			this.render();
+		}
+
+	};
+
+	Playback.prototype.animate = function() {
+
+		var progressBefore = this.progress;
+
+		this.progress = this.progressCheck();
+
+		// When we loop, offset the progress so that it eases
+		// smoothly rather than immediately resetting
+		if( progressBefore > 0.8 && this.progress < 0.2 ) {
+			this.progressOffset = this.progress;
+		}
+
+		this.render();
+
+		if( this.playing ) {
+			features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
+		}
+
+	};
+
+	/**
+	 * Renders the current progress and playback state.
+	 */
+	Playback.prototype.render = function() {
+
+		var progress = this.playing ? this.progress : 0,
+			radius = ( this.diameter2 ) - this.thickness,
+			x = this.diameter2,
+			y = this.diameter2,
+			iconSize = 28;
+
+		// Ease towards 1
+		this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
+
+		var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
+		var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
+
+		this.context.save();
+		this.context.clearRect( 0, 0, this.diameter, this.diameter );
+
+		// Solid background color
+		this.context.beginPath();
+		this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
+		this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
+		this.context.fill();
+
+		// Draw progress track
+		this.context.beginPath();
+		this.context.arc( x, y, radius, 0, Math.PI * 2, false );
+		this.context.lineWidth = this.thickness;
+		this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
+		this.context.stroke();
+
+		if( this.playing ) {
+			// Draw progress on top of track
+			this.context.beginPath();
+			this.context.arc( x, y, radius, startAngle, endAngle, false );
+			this.context.lineWidth = this.thickness;
+			this.context.strokeStyle = '#fff';
+			this.context.stroke();
+		}
+
+		this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
+
+		// Draw play/pause icons
+		if( this.playing ) {
+			this.context.fillStyle = '#fff';
+			this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
+			this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
+		}
+		else {
+			this.context.beginPath();
+			this.context.translate( 4, 0 );
+			this.context.moveTo( 0, 0 );
+			this.context.lineTo( iconSize - 4, iconSize / 2 );
+			this.context.lineTo( 0, iconSize );
+			this.context.fillStyle = '#fff';
+			this.context.fill();
+		}
+
+		this.context.restore();
+
+	};
+
+	Playback.prototype.on = function( type, listener ) {
+		this.canvas.addEventListener( type, listener, false );
+	};
+
+	Playback.prototype.off = function( type, listener ) {
+		this.canvas.removeEventListener( type, listener, false );
+	};
+
+	Playback.prototype.destroy = function() {
+
+		this.playing = false;
+
+		if( this.canvas.parentNode ) {
+			this.container.removeChild( this.canvas );
+		}
+
+	};
+
+
+	// --------------------------------------------------------------------//
+	// ------------------------------- API --------------------------------//
+	// --------------------------------------------------------------------//
+
+
+	Reveal = {
+		VERSION: VERSION,
+
+		initialize: initialize,
+		configure: configure,
+
+		sync: sync,
+		syncSlide: syncSlide,
+		syncFragments: syncFragments,
+
+		// Navigation methods
+		slide: slide,
+		left: navigateLeft,
+		right: navigateRight,
+		up: navigateUp,
+		down: navigateDown,
+		prev: navigatePrev,
+		next: navigateNext,
+
+		// Fragment methods
+		navigateFragment: navigateFragment,
+		prevFragment: previousFragment,
+		nextFragment: nextFragment,
+
+		// Deprecated aliases
+		navigateTo: slide,
+		navigateLeft: navigateLeft,
+		navigateRight: navigateRight,
+		navigateUp: navigateUp,
+		navigateDown: navigateDown,
+		navigatePrev: navigatePrev,
+		navigateNext: navigateNext,
+
+		// Forces an update in slide layout
+		layout: layout,
+
+		// Randomizes the order of slides
+		shuffle: shuffle,
+
+		// Returns an object with the available routes as booleans (left/right/top/bottom)
+		availableRoutes: availableRoutes,
+
+		// Returns an object with the available fragments as booleans (prev/next)
+		availableFragments: availableFragments,
+
+		// Toggles a help overlay with keyboard shortcuts
+		toggleHelp: toggleHelp,
+
+		// Toggles the overview mode on/off
+		toggleOverview: toggleOverview,
+
+		// Toggles the "black screen" mode on/off
+		togglePause: togglePause,
+
+		// Toggles the auto slide mode on/off
+		toggleAutoSlide: toggleAutoSlide,
+
+		// State checks
+		isOverview: isOverview,
+		isPaused: isPaused,
+		isAutoSliding: isAutoSliding,
+		isSpeakerNotes: isSpeakerNotes,
+
+		// Slide preloading
+		loadSlide: loadSlide,
+		unloadSlide: unloadSlide,
+
+		// Adds or removes all internal event listeners (such as keyboard)
+		addEventListeners: addEventListeners,
+		removeEventListeners: removeEventListeners,
+
+		// Facility for persisting and restoring the presentation state
+		getState: getState,
+		setState: setState,
+
+		// Presentation progress
+		getSlidePastCount: getSlidePastCount,
+
+		// Presentation progress on range of 0-1
+		getProgress: getProgress,
+
+		// Returns the indices of the current, or specified, slide
+		getIndices: getIndices,
+
+		// Returns an Array of all slides
+		getSlides: getSlides,
+
+		// Returns an Array of objects representing the attributes on
+		// the slides
+		getSlidesAttributes: getSlidesAttributes,
+
+		// Returns the total number of slides
+		getTotalSlides: getTotalSlides,
+
+		// Returns the slide element at the specified index
+		getSlide: getSlide,
+
+		// Returns the slide background element at the specified index
+		getSlideBackground: getSlideBackground,
+
+		// Returns the speaker notes string for a slide, or null
+		getSlideNotes: getSlideNotes,
+
+		// Returns an array with all horizontal/vertical slides in the deck
+		getHorizontalSlides: getHorizontalSlides,
+		getVerticalSlides: getVerticalSlides,
+
+		// Checks if the presentation contains two or more
+		// horizontal/vertical slides
+		hasHorizontalSlides: hasHorizontalSlides,
+		hasVerticalSlides: hasVerticalSlides,
+
+		// Returns the previous slide element, may be null
+		getPreviousSlide: function() {
+			return previousSlide;
+		},
+
+		// Returns the current slide element
+		getCurrentSlide: function() {
+			return currentSlide;
+		},
+
+		// Returns the current scale of the presentation content
+		getScale: function() {
+			return scale;
+		},
+
+		// Returns the current configuration object
+		getConfig: function() {
+			return config;
+		},
+
+		// Helper method, retrieves query string as a key/value hash
+		getQueryHash: function() {
+			var query = {};
+
+			location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
+				query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
+			} );
+
+			// Basic deserialization
+			for( var i in query ) {
+				var value = query[ i ];
+
+				query[ i ] = deserialize( unescape( value ) );
+			}
+
+			return query;
+		},
+
+		// Returns the top-level DOM element
+		getRevealElement: function() {
+			return dom.wrapper || document.querySelector( '.reveal' );
+		},
+
+		// Returns a hash with all registered plugins
+		getPlugins: function() {
+			return plugins;
+		},
+
+		// Returns true if we're currently on the first slide
+		isFirstSlide: function() {
+			return ( indexh === 0 && indexv === 0 );
+		},
+
+		// Returns true if we're currently on the last slide
+		isLastSlide: function() {
+			if( currentSlide ) {
+				// Does this slide have a next sibling?
+				if( currentSlide.nextElementSibling ) return false;
+
+				// If it's vertical, does its parent have a next sibling?
+				if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
+
+				return true;
+			}
+
+			return false;
+		},
+
+		// Returns true if we're on the last slide in the current
+		// vertical stack
+		isLastVerticalSlide: function() {
+			if( currentSlide && isVerticalSlide( currentSlide ) ) {
+				// Does this slide have a next sibling?
+				if( currentSlide.nextElementSibling ) return false;
+
+				return true;
+			}
+
+			return false;
+		},
+
+		// Checks if reveal.js has been loaded and is ready for use
+		isReady: function() {
+			return loaded;
+		},
+
+		// Forward event binding to the reveal DOM element
+		addEventListener: function( type, listener, useCapture ) {
+			if( 'addEventListener' in window ) {
+				Reveal.getRevealElement().addEventListener( type, listener, useCapture );
+			}
+		},
+		removeEventListener: function( type, listener, useCapture ) {
+			if( 'addEventListener' in window ) {
+				Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
+			}
+		},
+
+		// Adds/removes a custom key binding
+		addKeyBinding: addKeyBinding,
+		removeKeyBinding: removeKeyBinding,
+
+		// API for registering and retrieving plugins
+		registerPlugin: registerPlugin,
+		hasPlugin: hasPlugin,
+		getPlugin: getPlugin,
+
+		// Programmatically triggers a keyboard event
+		triggerKey: function( keyCode ) {
+			onDocumentKeyDown( { keyCode: keyCode } );
+		},
+
+		// Registers a new shortcut to include in the help overlay
+		registerKeyboardShortcut: function( key, value ) {
+			keyboardShortcuts[key] = value;
+		}
+	};
+
+	return Reveal;
+
+}));