Merge pull request #2651 from hakimel/dev

reveal.js 4.0.0

.github/workflows/js.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x]
+        node-version: [10.x, 13.x]
 
     steps:
     - uses: actions/checkout@v2

.gitignore

@@ -9,5 +9,4 @@ log/*.log
 tmp/**
 node_modules/
 .sass-cache
-css/reveal.min.css
-js/reveal.min.js
+dist/*.map

.npmignore

@@ -0,0 +1,7 @@
+/test
+/examples
+/css
+/js
+.github
+.gulpfile
+.sass-cache

README.md

@@ -1,1496 +1,23 @@
-# reveal.js ![tests](https://github.com/hakimel/reveal.js/workflows/tests/badge.svg) <a href="https://slides.com?ref=github"><img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
+<p align="center">
+  <img src="https://hakim-static.s3.amazonaws.com/reveal-js/logo/v1/reveal-black-text.svg" alt="reveal.js" width="450">
+  <br><br>
+  <img src="https://github.com/hakimel/reveal.js/workflows/tests/badge.svg">
+  <img src="https://s3.amazonaws.com/static.slid.es/images/slides-github-banner-320x40.png?1" alt="Slides" width="160" height="20"></a>
+</p>
 
-A framework for easily creating beautiful presentations using HTML. [Check out the live demo](https://revealjs.com/).
+reveal.js is an open source HTML presentation framework. It enables anyone with a web browser to create fully featured and beautiful presentations for free. [Check out the live demo](https://revealjs.com/).
 
-reveal.js comes with a broad range of features including [nested slides](https://github.com/hakimel/reveal.js#markup), [Markdown support](https://github.com/hakimel/reveal.js#markdown), [PDF export](https://github.com/hakimel/reveal.js#pdf-export), [speaker notes](https://github.com/hakimel/reveal.js#speaker-notes) and a [JavaScript API](https://github.com/hakimel/reveal.js#api). There's also a fully featured visual editor and platform for sharing reveal.js presentations at [slides.com](https://slides.com?ref=github).
+The framework comes with a broad range of features including [nested slides](https://revealjs.netlify.app/vertical-slides/), [Markdown support](https://revealjs.netlify.app/markdown/), [Auto-Animate](https://revealjs.netlify.app/auto-animate/), [PDF export](https://revealjs.netlify.app/pdf-export/), [speaker notes](https://revealjs.netlify.app/speaker-view/), [LaTeX support](https://revealjs.netlify.app/math/), [syntax highlighted code](https://revealjs.netlify.app/code/) and much more.
 
-### Supporting reveal.js
-This project was started and is maintained by [@hakimel](https://github.com/hakimel/) with the help of many [contributions from the community](https://github.com/hakimel/reveal.js/graphs/contributors). The best way to support the project is to [become a paying member of Slides.com](https://slides.com/pricing)—the reveal.js presentation platform that Hakim is building.
+<h1>
+  <a href="https://revealjs.netlify.app/installation" style="font-size: 3em;">Get Started</a>
+</h1>
 
-
-## Table of contents
-
-- [Online Editor](#online-editor)
-- [Installation](#installation)
-  - [Basic setup](#basic-setup)
-  - [Full setup](#full-setup)
-  - [Folder Structure](#folder-structure)
-- [Instructions](#instructions)
-  - [Markup](#markup)
-  - [Markdown](#markdown)
-  - [Element Attributes](#element-attributes)
-  - [Slide Attributes](#slide-attributes)
-- [Configuration](#configuration)
-- [Presentation Size](#presentation-size)
-- [Dependencies](#dependencies)
-- [Ready Event](#ready-event)
-- [Auto-sliding](#auto-sliding)
-- [Keyboard Bindings](#keyboard-bindings)
-- [Vertical Slide Navigation](#vertical-slide-navigation)
-- [Touch Navigation](#touch-navigation)
-- [Lazy Loading](#lazy-loading)
-- [API](#api)
-  - [Custom Key Bindings](#custom-key-bindings)
-  - [Slide Changed Event](#slide-changed-event)
-  - [Presentation State](#presentation-state)
-  - [Slide States](#slide-states)
-  - [Slide Backgrounds](#slide-backgrounds)
-  - [Parallax Background](#parallax-background)
-  - [Slide Transitions](#slide-transitions)
-  - [Internal links](#internal-links)
-  - [Fragments](#fragments)
-  - [Fragment events](#fragment-events)
-  - [Code syntax highlighting](#code-syntax-highlighting)
-  - [Slide number](#slide-number)
-  - [Overview mode](#overview-mode)
-  - [Fullscreen mode](#fullscreen-mode)
-  - [Embedded media](#embedded-media)
-  - [Stretching elements](#stretching-elements)
-  - [Resize Event](#resize-event)
-  - [postMessage API](#postmessage-api)
-- [PDF Export](#pdf-export)
-- [Theming](#theming)
-- [Speaker Notes](#speaker-notes)
-  - [Share and Print Speaker Notes](#share-and-print-speaker-notes)
-  - [Server Side Speaker Notes](#server-side-speaker-notes)
-- [Plugins](#plugins)
-- [Multiplexing](#multiplexing)
-  - [Master presentation](#master-presentation)
-  - [Client presentation](#client-presentation)
-  - [Socket.io server](#socketio-server)
-- [MathJax](#mathjax)
-- [License](#license)
-
-#### More reading
-
-- [Changelog](https://github.com/hakimel/reveal.js/releases): Up-to-date version history.
-- [Examples](https://github.com/hakimel/reveal.js/wiki/Example-Presentations): Presentations created with reveal.js, add your own!
-- [Browser Support](https://github.com/hakimel/reveal.js/wiki/Browser-Support): Explanation of browser support and fallbacks.
-- [Plugins](https://github.com/hakimel/reveal.js/wiki/Plugins,-Tools-and-Hardware): A list of plugins that can be used to extend reveal.js.
-
-
-## Online Editor
-
-Presentations are written using HTML or Markdown but there's also an online editor for those of you who prefer a graphical interface. Give it a try at [https://slides.com](https://slides.com?ref=github).
-
-
-## Installation
-
-The **basic setup** is for authoring presentations only. The **full setup** gives you access to all reveal.js features and plugins such as speaker notes as well as the development tasks needed to make changes to the source.
-
-### Basic setup
-
-The core of reveal.js is very easy to install. You'll simply need to download a copy of this repository and open the index.html file directly in your browser.
-
-1. Download the latest version of reveal.js from <https://github.com/hakimel/reveal.js/releases>
-2. Unzip and replace the example contents in index.html with your own
-3. Open index.html in a browser to view it
-
-### Full setup
-
-Some reveal.js features, like external Markdown and speaker notes, require that presentations run from a local web server. The following instructions will set up such a server as well as all of the development tasks needed to make edits to the reveal.js source code.
-
-1. Install [Node.js](https://nodejs.org/) (9.0.0 or later)
-
-1. Clone the reveal.js repository
-   ```sh
-   $ git clone https://github.com/hakimel/reveal.js.git
-   ```
-
-1. Navigate to the reveal.js folder
-   ```sh
-   $ cd reveal.js
-   ```
-
-1. Install dependencies
-   ```sh
-   $ npm install
-   ```
-
-1. Serve the presentation and monitor source files for changes
-   ```sh
-   $ npm start
-   ```
-
-1. Open <http://localhost:8000> to view your presentation
-
-   You can change the port by using `npm start -- --port=8001`.
-
-### Folder Structure
-
-- **css/** Core styles without which the project does not function
-- **js/** Like above but for JavaScript
-- **plugin/** Components that have been developed as extensions to reveal.js
-- **lib/** All other third party assets (JavaScript, CSS, fonts)
-
-
-## Instructions
-
-### Markup
-
-Here's a barebones example of a fully working reveal.js presentation:
-```html
-<html>
-	<head>
-		<link rel="stylesheet" href="css/reveal.css">
-		<link rel="stylesheet" href="css/theme/white.css">
-	</head>
-	<body>
-		<div class="reveal">
-			<div class="slides">
-				<section>Slide 1</section>
-				<section>Slide 2</section>
-			</div>
-		</div>
-		<script src="js/reveal.js"></script>
-		<script>
-			Reveal.initialize();
-		</script>
-	</body>
-</html>
-```
-
-The presentation markup hierarchy needs to be `.reveal > .slides > section` where the `section` represents one slide and can be repeated indefinitely. If you place multiple `section` elements inside of another `section` they will be shown as vertical slides. The first of the vertical slides is the "root" of the others (at the top), and will be included in the horizontal sequence. For example:
-
-```html
-<div class="reveal">
-	<div class="slides">
-		<section>Single Horizontal Slide</section>
-		<section>
-			<section>Vertical Slide 1</section>
-			<section>Vertical Slide 2</section>
-		</section>
-	</div>
-</div>
-```
-
-### Markdown
-
-It's possible to write your slides using Markdown. To enable Markdown, add the `data-markdown` attribute to your `<section>` elements and wrap the contents in a `<textarea data-template>` like the example below. You'll also need to add the `plugin/markdown/marked.js` and `plugin/markdown/markdown.js` scripts (in that order) to your HTML file.
-
-This is based on [data-markdown](https://gist.github.com/1343518) from [Paul Irish](https://github.com/paulirish) modified to use [marked](https://github.com/chjj/marked) to support [GitHub Flavored Markdown](https://help.github.com/articles/github-flavored-markdown). Sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).
-
-```html
-<section data-markdown>
-	<textarea data-template>
-		## Page title
-
-		A paragraph with some text and a [link](http://hakim.se).
-	</textarea>
-</section>
-```
-
-#### External Markdown
-
-You can write your content as a separate file and have reveal.js load it at runtime. Note the separator arguments which determine how slides are delimited in the external file: the `data-separator` attribute defines a regular expression for horizontal slides (defaults to `^\r?\n---\r?\n$`, a newline-bounded horizontal rule)  and `data-separator-vertical` defines vertical slides (disabled by default). The `data-separator-notes` attribute is a regular expression for specifying the beginning of the current slide's speaker notes (defaults to `notes?:`, so it will match both "note:" and "notes:"). The `data-charset` attribute is optional and specifies which charset to use when loading the external file.
-
-When used locally, this feature requires that reveal.js [runs from a local web server](#full-setup).  The following example customises all available options:
-
-```html
-<section data-markdown="example.md"
-         data-separator="^\n\n\n"
-         data-separator-vertical="^\n\n"
-         data-separator-notes="^Note:"
-         data-charset="iso-8859-15">
-    <!--
-        Note that Windows uses `\r\n` instead of `\n` as its linefeed character.
-        For a regex that supports all operating systems, use `\r?\n` instead of `\n`.
-    -->
-</section>
-```
-
-#### Element Attributes
-
-Special syntax (through HTML comments) is available for adding attributes to Markdown elements. This is useful for fragments, amongst other things.
-
-```html
-<section data-markdown>
-	<script type="text/template">
-		- Item 1 <!-- .element: class="fragment" data-fragment-index="2" -->
-		- Item 2 <!-- .element: class="fragment" data-fragment-index="1" -->
-	</script>
-</section>
-```
-
-#### Slide Attributes
-
-Special syntax (through HTML comments) is available for adding attributes to the slide `<section>` elements generated by your Markdown.
-
-```html
-<section data-markdown>
-	<script type="text/template">
-	<!-- .slide: data-background="#ff0000" -->
-		Markdown content
-	</script>
-</section>
-```
-
-#### Configuring *marked*
-
-We use [marked](https://github.com/chjj/marked) to parse Markdown. To customise marked's rendering, you can pass in options when [configuring Reveal](#configuration):
-
-```javascript
-Reveal.initialize({
-	// Options which are passed into marked
-	// See https://marked.js.org/#/USING_ADVANCED.md#options
-	markdown: {
-		smartypants: true
-	}
-});
-```
-
-### Configuration
-
-At the end of your page you need to initialize reveal by running the following code. Note that all configuration values are optional and will default to the values specified below.
-
-```javascript
-Reveal.initialize({
-
-	// 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
-	slideNumber: 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,
-
-	// Enable the slide overview mode
-	overview: true,
-
-	// 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,
-
-	// See https://github.com/hakimel/reveal.js/#navigation-mode
-	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 questionmark
-	// key is pressed
-	help: true,
-
-	// Flags if speaker notes should be visible to all viewers
-	showNotes: false,
-
-	// Global override for autoplaying 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,
-
-	// Number of milliseconds between automatically proceeding to the
-	// next slide, disabled when set to 0, this value can be overwritten
-	// by using a data-autoslide attribute on your slides
-	autoSlide: 0,
-
-	// Stop auto-sliding after user input
-	autoSlideStoppable: true,
-
-	// Use this method for navigation when auto-sliding
-	autoSlideMethod: Reveal.navigateNext,
-
-	// 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: 120,
-
-	// Specify the total time in seconds that is available to
-	// present.  If this is set to a nonzero value, the pacing
-	// timer will work out the time available for each slide,
-	// instead of using the defaultTiming value
-	totalTime: 0,
-
-	// Specify the minimum amount of time you want to allot to
-	// each slide, if using the totalTime calculation method.  If
-	// the automated time allocation causes slide pacing to fall
-	// below this threshold, then you will see an alert in the
-	// speaker notes window
-	minimumTimePerSlide: 0,
-
-	// Enable slide navigation via mouse wheel
-	mouseWheel: false,
-
-	// Hide cursor if inactive
-	hideInactiveCursor: true,
-
-	// Time before the cursor is hidden (in ms)
-	hideCursorTime: 5000,
-
-	// 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,
-
-	// 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
-
-	// 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,
-
-	// Parallax background image
-	parallaxBackgroundImage: '', // e.g. "'https://s3.amazonaws.com/hakim-static/reveal-js/reveal-parallax-1.jpg'"
-
-	// Parallax background size
-	parallaxBackgroundSize: '', // CSS syntax, e.g. "2100px 900px"
-
-	// Number of pixels to move the parallax background per slide
-	// - Calculated automatically unless specified
-	// - Set to 0 to disable movement along an axis
-	parallaxBackgroundHorizontal: null,
-	parallaxBackgroundVertical: null,
-
-	// The display mode that will be used to show slides
-	display: 'block'
-
-});
-```
-
-The configuration can be updated after initialization using the `configure` method:
-
-```javascript
-// Turn autoSlide off
-Reveal.configure({ autoSlide: 0 });
-
-// Start auto-sliding every 5s
-Reveal.configure({ autoSlide: 5000 });
-```
-
-### Presentation Size
-
-All presentations have a normal size, that is, the resolution at which they are authored. The framework will automatically scale presentations uniformly based on this size to ensure that everything fits on any given display or viewport.
-
-See below for a list of configuration options related to sizing, including default values:
-
-```javascript
-Reveal.initialize({
-
-	// ...
-
-	// The "normal" size of the presentation, aspect ratio will be preserved
-	// when the presentation is scaled to fit different resolutions. Can be
-	// specified using percentage units.
-	width: 960,
-	height: 700,
-
-	// Factor of the display size that should remain empty around the content
-	margin: 0.1,
-
-	// Bounds for smallest/largest possible scale to apply to content
-	minScale: 0.2,
-	maxScale: 1.5
-
-});
-```
-
-If you wish to disable this behavior and do your own scaling (e.g. using media queries), try these settings:
-
-```javascript
-Reveal.initialize({
-
-	// ...
-
-	width: "100%",
-	height: "100%",
-	margin: 0,
-	minScale: 1,
-	maxScale: 1
-});
-```
-
-### Dependencies
-
-Reveal.js doesn't _rely_ on any third party scripts to work but a few optional libraries are included by default. These libraries are loaded as dependencies in the order they appear, for example:
-
-```javascript
-Reveal.initialize({
-	dependencies: [
-		// Interpret Markdown in <section> elements
-		{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-		{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-
-		// Syntax highlight for <code> elements
-		{ src: 'plugin/highlight/highlight.js', async: true },
-
-		// Zoom in and out with Alt+click
-		{ src: 'plugin/zoom-js/zoom.js', async: true },
-
-		// Speaker notes
-		{ src: 'plugin/notes/notes.js', async: true },
-
-		// MathJax
-		{ src: 'plugin/math/math.js', async: true }
-	]
-});
-```
-
-You can add your own extensions using the same syntax. The following properties are available for each dependency object:
-- **src**: Path to the script to load
-- **async**: [optional] Flags if the script should load after reveal.js has started, defaults to false
-- **callback**: [optional] Function to execute when the script has loaded
-- **condition**: [optional] Function which must return true for the script to be loaded
-
-### Ready Event
-
-A `ready` event is fired when reveal.js has loaded all non-async dependencies and is ready to start navigating. To check if reveal.js is already 'ready' you can call `Reveal.isReady()`.
-
-```javascript
-Reveal.addEventListener( 'ready', function( event ) {
-	// event.currentSlide, event.indexh, event.indexv
-} );
-```
-
-Note that we also add a `.ready` class to the `.reveal` element so that you can hook into this with CSS.
-
-### Auto-sliding
-
-Presentations can be configured to progress through slides automatically, without any user input. To enable this you will need to tell the framework how many milliseconds it should wait between slides:
-
-```javascript
-// Slide every five seconds
-Reveal.configure({
-  autoSlide: 5000
-});
-```
-
-When this is turned on a control element will appear that enables users to pause and resume auto-sliding. Alternatively, sliding can be paused or resumed by pressing »A« on the keyboard. Sliding is paused automatically as soon as the user starts navigating. You can disable these controls by specifying `autoSlideStoppable: false` in your reveal.js config.
-
-You can also override the slide duration for individual slides and fragments by using the `data-autoslide` attribute:
-
-```html
-<section data-autoslide="2000">
-	<p>After 2 seconds the first fragment will be shown.</p>
-	<p class="fragment" data-autoslide="10000">After 10 seconds the next fragment will be shown.</p>
-	<p class="fragment">Now, the fragment is displayed for 2 seconds before the next slide is shown.</p>
-</section>
-```
-
-To override the method used for navigation when auto-sliding, you can specify the `autoSlideMethod` setting. To only navigate along the top layer and ignore vertical slides, set this to `Reveal.navigateRight`.
-
-Whenever the auto-slide mode is resumed or paused the `autoslideresumed` and `autoslidepaused` events are fired.
-
-### Keyboard Bindings
-
-If you're unhappy with any of the default keyboard bindings you can override them using the `keyboard` config option:
-
-```javascript
-Reveal.configure({
-  keyboard: {
-    13: 'next', // go to the next slide when the ENTER key is pressed
-    27: function() {}, // do something custom when ESC is pressed
-    32: null // don't do anything when SPACE is pressed (i.e. disable a reveal.js default binding)
-  }
-});
-```
-
-### Vertical Slide Navigation
-
-Slides can be nested within other slides to create vertical stacks (see [Markup](#markup)). When presenting, you use the left/right arrows to step through the main (horizontal) slides. When you arrive at a vertical stack you can optionally press the up/down arrows to view the vertical slides or skip past them by pressing the right arrow. Here's an example showing a bird's-eye view of what this looks like in action:
-
-<img src="https://static.slid.es/support/reveal.js-vertical-slides.gif" width="450">
-
-#### Navigation Mode
-You can fine tune the reveal.js navigation behavior by using the `navigationMode` config option. Note that these options are only useful for presentations that use a mix of horizontal and vertical slides. The following navigation modes are available:
-
-| Value                         | Description |
-| :---------------------------  | :---------- |
-| 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.<br><br>Consider a deck with six slides ordered in two vertical stacks:<br>`1.1`&nbsp;&nbsp;&nbsp;&nbsp;`2.1`<br>`1.2`&nbsp;&nbsp;&nbsp;&nbsp;`2.2`<br>`1.3`&nbsp;&nbsp;&nbsp;&nbsp;`2.3`<br><br>If you're on slide 1.3 and navigate right, you will normally move from 1.3 -> 2.1. With navigationMode set to "grid" the same navigation takes you from 1.3 -> 2.3. |
-
-### Touch Navigation
-
-You can swipe to navigate through a presentation on any touch-enabled device. Horizontal swipes change between horizontal slides, vertical swipes change between vertical slides. If you wish to disable this you can set the `touch` config option to false when initializing reveal.js.
-
-If there's some part of your content that needs to remain accessible to touch events you'll need to highlight this by adding a `data-prevent-swipe` attribute to the element. One common example where this is useful is elements that need to be scrolled.
-
-### Lazy Loading
-
-When working on presentation with a lot of media or iframe content it's important to load lazily. Lazy loading means that reveal.js will only load content for the few slides nearest to the current slide. The number of slides that are preloaded is determined by the `viewDistance` configuration option.
-
-To enable lazy loading all you need to do is change your `src` attributes to `data-src` as shown below. This is supported for image, video, audio and iframe elements.
-
-```html
-<section>
-  <img data-src="image.png">
-  <iframe data-src="http://hakim.se"></iframe>
-  <video>
-    <source data-src="video.webm" type="video/webm" />
-    <source data-src="video.mp4" type="video/mp4" />
-  </video>
-</section>
-```
-
-#### Lazy Loading Iframes
-
-Note that lazy loaded iframes ignore the `viewDistance` configuration and will only load when their containing slide becomes visible. Iframes are also unloaded as soon as the slide is hidden.
-
-When we lazy load a video or audio element, reveal.js won't start playing that content until the slide becomes visible. However there is no way to control this for an iframe since that could contain any kind of content. That means if we loaded an iframe before the slide is visible on screen it could begin playing media and sound in the background.
-
-You can override this behavior with the `data-preload` attribute. The iframe below will be loaded
-according to the `viewDistance`.
-
-```html
-<section>
-	<iframe data-src="http://hakim.se" data-preload></iframe>
-</section>
-```
-
-You can also change the default globally with the `preloadIframes` configuration option. If set to
-`true` ALL iframes with a `data-src` attribute will be preloaded when within the `viewDistance`
-regardless of individual `data-preload` attributes. If set to `false`, all iframes will only be
-loaded when they become visible.
-
-### API
-
-The `Reveal` object exposes a JavaScript API for controlling navigation and reading state:
-
-```javascript
-// Navigation
-Reveal.slide( indexh, indexv, indexf );
-Reveal.left();
-Reveal.right();
-Reveal.up();
-Reveal.down();
-Reveal.prev();
-Reveal.next();
-Reveal.prevFragment();
-Reveal.nextFragment();
-
-// Randomize the order of slides
-Reveal.shuffle();
-
-// Toggle presentation states, optionally pass true/false to force on/off
-Reveal.toggleOverview();
-Reveal.togglePause();
-Reveal.toggleAutoSlide();
-
-// Shows a help overlay with keyboard shortcuts, optionally pass true/false
-// to force on/off
-Reveal.toggleHelp();
-
-// Change a config value at runtime
-Reveal.configure({ controls: true });
-
-// Returns the present configuration options
-Reveal.getConfig();
-
-// Fetch the current scale of the presentation
-Reveal.getScale();
-
-// Retrieves the previous and current slide elements
-Reveal.getPreviousSlide();
-Reveal.getCurrentSlide();
-
-Reveal.getIndices();        // { h: 0, v: 0, f: 0 }
-Reveal.getSlidePastCount();
-Reveal.getProgress();       // (0 == first slide, 1 == last slide)
-Reveal.getSlides();         // Array of all slides
-Reveal.getTotalSlides();    // Total number of slides
-
-// Returns an array with all horizontal/vertical slides in the deck
-Reveal.getHorizontalSlides();
-Reveal.getVerticalSlides();
-
-// Checks if the presentation contains two or more
-// horizontal/vertical slides
-Reveal.hasHorizontalSlides();
-Reveal.hasVerticalSlides();
-
-// Returns the speaker notes for the current slide
-Reveal.getSlideNotes();
-
-// State checks
-Reveal.isFirstSlide();
-Reveal.isLastSlide();
-Reveal.isOverview();
-Reveal.isPaused();
-Reveal.isAutoSliding();
-
-// Returns the top-level DOM element
-Reveal.getRevealElement(); // <div class="reveal">...</div>
-```
-
-### Custom Key Bindings
-
-Custom key bindings can be added and removed using the following Javascript API. Custom key bindings will override the default keyboard bindings, but will in turn be overridden by the user defined bindings in the ``keyboard`` config option.
-
-```javascript
-Reveal.addKeyBinding( binding, callback );
-Reveal.removeKeyBinding( keyCode );
-```
-
-For example
-
-```javascript
-// The binding parameter provides the following properties
-//      keyCode: the keycode for binding to the callback
-//          key: the key label to show in the help overlay
-//  description: the description of the action to show in the help overlay
-Reveal.addKeyBinding( { keyCode: 84, key: 'T', description: 'Start timer' }, function() {
-	// start timer
-} )
-
-// The binding parameter can also be a direct keycode without providing the help description
-Reveal.addKeyBinding( 82, function() {
-	// reset timer
-} )
-```
-
-This allows plugins to add key bindings directly to Reveal so they can
-
-* make use of Reveal's pre-processing logic for key handling (for example, ignoring key presses when paused); and
-* be included in the help overlay (optional)
-
-### Slide Changed Event
-
-A `slidechanged` event is fired each time the slide is changed (regardless of state). The event object holds the index values of the current slide as well as a reference to the previous and current slide HTML nodes.
-
-Some libraries, like MathJax (see [#226](https://github.com/hakimel/reveal.js/issues/226#issuecomment-10261609)), get confused by the transforms and display states of slides. Often times, this can be fixed by calling their update or render function from this callback.
-
-```javascript
-Reveal.addEventListener( 'slidechanged', function( event ) {
-	// event.previousSlide, event.currentSlide, event.indexh, event.indexv
-} );
-```
-
-### Presentation State
-
-The presentation's current state can be fetched by using the `getState` method. A state object contains all of the information required to put the presentation back as it was when `getState` was first called. Sort of like a snapshot. It's a simple object that can easily be stringified and persisted or sent over the wire.
-
-```javascript
-Reveal.slide( 1 );
-// we're on slide 1
-
-var state = Reveal.getState();
-
-Reveal.slide( 3 );
-// we're on slide 3
-
-Reveal.setState( state );
-// we're back on slide 1
-```
-
-### Slide States
-
-If you set `data-state="somestate"` on a slide `<section>`, "somestate" will be applied as a class on the document element when that slide is opened. This allows you to apply broad style changes to the page based on the active slide.
-
-Furthermore you can also listen to these changes in state via JavaScript:
-
-```javascript
-Reveal.addEventListener( 'somestate', function() {
-	// TODO: Sprinkle magic
-}, false );
-```
-
-### Slide Backgrounds
-
-Slides are contained within a limited portion of the screen by default to allow them to fit any display and scale uniformly. You can apply full page backgrounds outside of the slide area by adding a `data-background` attribute to your `<section>` elements. Four different types of backgrounds are supported: color, image, video and iframe.
-
-#### Color Backgrounds
-
-All CSS color formats are supported, including hex values, keywords, `rgba()` or `hsl()`.
-
-```html
-<section data-background-color="#ff0000">
-	<h2>Color</h2>
-</section>
-```
-
-#### Image Backgrounds
-
-By default, background images are resized to cover the full page. Available options:
-
-| Attribute                        | Default    | Description |
-| :------------------------------- | :--------- | :---------- |
-| data-background-image            |            | URL of the image to show. GIFs restart when the slide opens. |
-| data-background-size             | cover      | See [background-size](https://developer.mozilla.org/docs/Web/CSS/background-size) on MDN.  |
-| data-background-position         | center     | See [background-position](https://developer.mozilla.org/docs/Web/CSS/background-position) on MDN. |
-| data-background-repeat           | no-repeat  | See [background-repeat](https://developer.mozilla.org/docs/Web/CSS/background-repeat) on MDN. |
-| data-background-opacity          | 1          | Opacity of the background image on a 0-1 scale. 0 is transparent and 1 is fully opaque. |
-
-```html
-<section data-background-image="http://example.com/image.png">
-	<h2>Image</h2>
-</section>
-<section data-background-image="http://example.com/image.png" data-background-size="100px" data-background-repeat="repeat">
-	<h2>This background image will be sized to 100px and repeated</h2>
-</section>
-```
-
-#### Video Backgrounds
-
-Automatically plays a full size video behind the slide.
-
-| Attribute                        | Default | Description |
-| :---------------------------     | :------ | :---------- |
-| data-background-video            |         | A single video source, or a comma separated list of video sources. |
-| data-background-video-loop       | false   | Flags if the video should play repeatedly. |
-| data-background-video-muted      | false   | Flags if the audio should be muted. |
-| data-background-size             | cover   | Use `cover` for full screen and some cropping or `contain` for letterboxing. |
-| data-background-opacity          | 1       | Opacity of the background video on a 0-1 scale. 0 is transparent and 1 is fully opaque. |
-
-```html
-<section data-background-video="https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.mp4,https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.webm" data-background-video-loop data-background-video-muted>
-	<h2>Video</h2>
-</section>
-```
-
-#### Iframe Backgrounds
-
-Embeds a web page as a slide background that covers 100% of the reveal.js width and height. The iframe is in the background layer, behind your slides, and as such it's not possible to interact with it by default. To make your background interactive, you can add the `data-background-interactive` attribute.
-
-```html
-<section data-background-iframe="https://slides.com" data-background-interactive>
-	<h2>Iframe</h2>
-</section>
-```
-
-Iframes are lazy-loaded when they become visible. If you'd like to preload iframes ahead of time, you can append a `data-preload` attribute to the slide `<section>`. You can also enable preloading globally for all iframes using the `preloadIframes` configuration option.
-
-#### Background Transitions
-
-Backgrounds transition using a fade animation by default. This can be changed to a linear sliding transition by passing `backgroundTransition: 'slide'` to the `Reveal.initialize()` call. Alternatively you can set `data-background-transition` on any section with a background to override that specific transition.
-
-
-### Parallax Background
-
-If you want to use a parallax scrolling background, set the first two properties below when initializing reveal.js (the other two are optional).
-
-```javascript
-Reveal.initialize({
-
-	// Parallax background image
-	parallaxBackgroundImage: '', // e.g. "https://s3.amazonaws.com/hakim-static/reveal-js/reveal-parallax-1.jpg"
-
-	// Parallax background size
-	parallaxBackgroundSize: '', // CSS syntax, e.g. "2100px 900px" - currently only pixels are supported (don't use % or auto)
-
-	// Number of pixels to move the parallax background per slide
-	// - Calculated automatically unless specified
-	// - Set to 0 to disable movement along an axis
-	parallaxBackgroundHorizontal: 200,
-	parallaxBackgroundVertical: 50
-
-});
-```
-
-Make sure that the background size is much bigger than screen size to allow for some scrolling. [View example](http://revealjs.com/?parallaxBackgroundImage=https%3A%2F%2Fs3.amazonaws.com%2Fhakim-static%2Freveal-js%2Freveal-parallax-1.jpg&parallaxBackgroundSize=2100px%20900px).
-
-### Slide Transitions
-
-The global presentation transition is set using the `transition` config value. You can override the global transition for a specific slide by using the `data-transition` attribute:
-
-```html
-<section data-transition="zoom">
-	<h2>This slide will override the presentation transition and zoom!</h2>
-</section>
-
-<section data-transition-speed="fast">
-	<h2>Choose from three transition speeds: default, fast or slow!</h2>
-</section>
-```
-
-You can also use different in and out transitions for the same slide:
-
-```html
-<section data-transition="slide">
-    The train goes on …
-</section>
-<section data-transition="slide">
-    and on …
-</section>
-<section data-transition="slide-in fade-out">
-    and stops.
-</section>
-<section data-transition="fade-in slide-out">
-    (Passengers entering and leaving)
-</section>
-<section data-transition="slide">
-    And it starts again.
-</section>
-```
-You can choose from `none`, `fade`, `slide`, `convex`, `concave` and `zoom`.
-### Internal links
-
-It's easy to link between slides. The first example below targets the index of another slide whereas the second targets a slide with an ID attribute (`<section id="some-slide">`):
-
-```html
-<a href="#/2/2">Link</a>
-<a href="#/some-slide">Link</a>
-```
-
-You can also add relative navigation links, similar to the built in reveal.js controls, by appending one of the following classes on any element. Note that each element is automatically given an `enabled` class when it's a valid navigation route based on the current slide.
-
-```html
-<a href="#" class="navigate-left">
-<a href="#" class="navigate-right">
-<a href="#" class="navigate-up">
-<a href="#" class="navigate-down">
-<a href="#" class="navigate-prev"> <!-- Previous vertical or horizontal slide -->
-<a href="#" class="navigate-next"> <!-- Next vertical or horizontal slide -->
-```
-
-### Fragments
-
-Fragments are used to highlight individual elements on a slide. Every element with the class `fragment` will be stepped through before moving on to the next slide. Here's an example: http://revealjs.com/#/fragments
-
-The default fragment style is to start out invisible and fade in. This style can be changed by appending a different class to the fragment:
-
-```html
-<section>
-	<p class="fragment grow">grow</p>
-	<p class="fragment shrink">shrink</p>
-	<p class="fragment strike">strike</p>
-	<p class="fragment fade-out">fade-out</p>
-	<p class="fragment fade-up">fade-up (also down, left and right!)</p>
-	<p class="fragment fade-in-then-out">fades in, then out when we move to the next step</p>
-	<p class="fragment fade-in-then-semi-out">fades in, then obfuscate when we move to the next step</p>
-	<p class="fragment highlight-current-blue">blue only once</p>
-	<p class="fragment highlight-red">highlight-red</p>
-	<p class="fragment highlight-green">highlight-green</p>
-	<p class="fragment highlight-blue">highlight-blue</p>
-</section>
-```
-
-Multiple fragments can be applied to the same element sequentially by wrapping it, this will fade in the text on the first step and fade it back out on the second.
-
-```html
-<section>
-	<span class="fragment fade-in">
-		<span class="fragment fade-out">I'll fade in, then out</span>
-	</span>
-</section>
-```
-
-The display order of fragments can be controlled using the `data-fragment-index` attribute.
-
-```html
-<section>
-	<p class="fragment" data-fragment-index="3">Appears last</p>
-	<p class="fragment" data-fragment-index="1">Appears first</p>
-	<p class="fragment" data-fragment-index="2">Appears second</p>
-</section>
-```
-
-### Fragment events
-
-When a slide fragment is either shown or hidden reveal.js will dispatch an event.
-
-Some libraries, like MathJax (see #505), get confused by the initially hidden fragment elements. Often times this can be fixed by calling their update or render function from this callback.
-
-```javascript
-Reveal.addEventListener( 'fragmentshown', function( event ) {
-	// event.fragment = the fragment DOM element
-} );
-Reveal.addEventListener( 'fragmenthidden', function( event ) {
-	// event.fragment = the fragment DOM element
-} );
-```
-
-### Code Syntax Highlighting
-
-By default, Reveal is configured with [highlight.js](https://highlightjs.org/) for code syntax highlighting. To enable syntax highlighting, you'll have to load the highlight plugin ([plugin/highlight/highlight.js](plugin/highlight/highlight.js)) and a highlight.js CSS theme (Reveal comes packaged with the Monokai themes: [lib/css/monokai.css](lib/css/monokai.css)).
-
-```javascript
-Reveal.initialize({
-	// More info https://github.com/hakimel/reveal.js#dependencies
-	dependencies: [
-		{ src: 'plugin/highlight/highlight.js', async: true },
-	]
-});
-```
-
-Below is an example with clojure code that will be syntax highlighted. When the `data-trim` attribute is present, surrounding whitespace is automatically removed.  HTML will be escaped by default. To avoid this, for example if you are using `<mark>` to call out a line of code, add the `data-noescape` attribute to the `<code>` element.
-
-```html
-<section>
-	<pre><code data-trim data-noescape>
-(def lazy-fib
-  (concat
-   [0 1]
-   <mark>((fn rfib [a b]</mark>
-        (lazy-cons (+ a b) (rfib b (+ a b)))) 0 1)))
-	</code></pre>
-</section>
-```
-
-#### Line Numbers & Highlights
-
-To enable line numbers, add `data-line-numbers` to your `<code>` tags. If you want to highlight specific lines you can provide a comma separated list of line numbers using the same attribute. For example, in the following example lines 4 and 8-11 are highlighted:
-
-```html
-<pre><code class="hljs" data-line-numbers="4,8-11">
-import React, { useState } from 'react';
- 
-function Example() {
-  const [count, setCount] = useState(0);
- 
-  return (
-    <div>
-      <p>You clicked {count} times</p>
-      <button onClick={() => setCount(count + 1)}>
-        Click me
-      </button>
-    </div>
-  );
-}
-</code></pre>
-```
-
-<img width="300" alt="line-numbers" src="https://user-images.githubusercontent.com/629429/55332077-eb3c4780-5494-11e9-8854-ba33cd0fa740.png">
-
-#### Step-by-step Highlights
-
-You can step through multiple code highlights on the same code block. Delimit each of your highlight steps with the `|` character. For example `data-line-numbers="1|2-3|4,6-10"` will produce three steps. It will start by highlighting line 1, next step is lines 2-3, and finally line 4 and 6 through 10.
-
-
-
-### Slide number
-
-If you would like to display the page number of the current slide you can do so using the `slideNumber` and `showSlideNumber` configuration values.
-
-```javascript
-// Shows the slide number using default formatting
-Reveal.configure({ slideNumber: true });
-
-// Slide number formatting can be configured using these variables:
-//  "h.v": 	horizontal . vertical slide number (default)
-//  "h/v": 	horizontal / vertical slide number
-//    "c": 	flattened slide number
-//  "c/t": 	flattened slide number / total slides
-Reveal.configure({ slideNumber: 'c/t' });
-
-// You can provide a function to fully customize the number:
-Reveal.configure({ slideNumber: function( slide ) {
-    // Ignore numbering of vertical slides
-    return [ Reveal.getIndices( slide ).h ];
-}});
-
-// Control which views the slide number displays on using the "showSlideNumber" value:
-//     "all": show on all views (default)
-// "speaker": only show slide numbers on speaker notes view
-//   "print": only show slide numbers when printing to PDF
-Reveal.configure({ showSlideNumber: 'speaker' });
-```
-
-### Overview mode
-
-Press »ESC« or »O« keys to toggle the overview mode on and off. While you're in this mode, you can still navigate between slides,
-as if you were at 1,000 feet above your presentation. The overview mode comes with a few API hooks:
-
-```javascript
-Reveal.addEventListener( 'overviewshown', function( event ) { /* ... */ } );
-Reveal.addEventListener( 'overviewhidden', function( event ) { /* ... */ } );
-
-// Toggle the overview mode programmatically
-Reveal.toggleOverview();
-```
-
-### Fullscreen mode
-
-Just press »F« on your keyboard to show your presentation in fullscreen mode. Press the »ESC« key to exit fullscreen mode.
-
-### Embedded media
-
-Add `data-autoplay` to your media element if you want it to automatically start playing when the slide is shown:
-
-```html
-<video data-autoplay src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>
-```
-
-If you want to enable or disable autoplay globally, for all embedded media, you can use the `autoPlayMedia` configuration option. If you set this to `true` ALL media will autoplay regardless of individual `data-autoplay` attributes. If you initialize with `autoPlayMedia: false` NO media will autoplay.
-
-Note that embedded HTML5 `<video>`/`<audio>` and YouTube/Vimeo iframes are automatically paused when you navigate away from a slide. This can be disabled by decorating your element with a `data-ignore` attribute.
-
-### Embedded iframes
-
-reveal.js automatically pushes two [post messages](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage) to embedded iframes. `slide:start` when the slide containing the iframe is made visible and `slide:stop` when it is hidden.
-
-### Stretching elements
-
-Sometimes it's desirable to have an element, like an image or video, stretch to consume as much space as possible within a given slide. This can be done by adding the `.stretch` class to an element as seen below:
-
-```html
-<section>
-	<h2>This video will use up the remaining space on the slide</h2>
-    <video class="stretch" src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>
-</section>
-```
-
-Limitations:
-- Only direct descendants of a slide section can be stretched
-- Only one descendant per slide section can be stretched
-
-### Resize Event
-
-When reveal.js changes the scale of the slides it fires a resize event. You can subscribe to the event to resize your elements accordingly.
-
-```javascript
-Reveal.addEventListener( 'resize', function( event ) {
-	// event.scale, event.oldScale, event.size
-} );
-```
-
-### postMessage API
-
-The framework has a built-in postMessage API that can be used when communicating with a presentation inside of another window. Here's an example showing how you'd make a reveal.js instance in the given window proceed to slide 2:
-
-```javascript
-<window>.postMessage( JSON.stringify({ method: 'slide', args: [ 2 ] }), '*' );
-```
-
-#### postMessage Events
-
-When reveal.js runs inside of an iframe it can optionally bubble all of its events to the parent. Bubbled events are stringified JSON with three fields: namespace, eventName and state. Here's how you subscribe to them from the parent window:
-
-```javascript
-window.addEventListener( 'message', function( event ) {
-	var data = JSON.parse( event.data );
-	if( data.namespace === 'reveal' && data.eventName === 'slidechanged' ) {
-		// Slide changed, see data.state for slide number
-	}
-} );
-```
-
-#### postMessage Callbacks
-
-When you call any method via the postMessage API, reveal.js will dispatch a message with the return value. This is done so that you can call a getter method and see what the result is. Check out this example:
-
-```javascript
-<revealWindow>.postMessage( JSON.stringify({ method: 'getTotalSlides' }), '*' );
-
-window.addEventListener( 'message', function( event ) {
-	var data = JSON.parse( event.data );
-	// `data.method`` is the method that we invoked
-	if( data.namespace === 'reveal' && data.eventName === 'callback' && data.method === 'getTotalSlides' ) {
-		data.result // = the total number of slides
-	}
-} );
-```
-
-#### Turning postMessage on/off
-
-This cross-window messaging can be toggled on or off using configuration flags. These are the default values.
-
-```javascript
-Reveal.initialize({
-	// ...
-
-	// Exposes the reveal.js API through window.postMessage
-	postMessage: true,
-
-	// Dispatches all reveal.js events to the parent window through postMessage
-	postMessageEvents: false
-});
-```
-
-
-## PDF Export
-
-Presentations can be exported to PDF via a special print stylesheet. This feature requires that you use [Google Chrome](http://google.com/chrome) or [Chromium](https://www.chromium.org/Home) and to be serving the presentation from a web server.
-Here's an example of an exported presentation that's been uploaded to SlideShare: http://www.slideshare.net/hakimel/revealjs-300.
-
-### Separate pages for fragments
-[Fragments](#fragments) are printed on separate slides by default. Meaning if you have a slide with three fragment steps, it will generate three separate slides where the fragments appear incrementally.
-
-If you prefer printing all fragments in their visible states on the same slide you can set the `pdfSeparateFragments` config option to false.
-
-### Page size
-
-Export dimensions are inferred from the configured [presentation size](#presentation-size). Slides that are too tall to fit within a single page will expand onto multiple pages. You can limit how many pages a slide may expand onto using the `pdfMaxPagesPerSlide` config option, for example `Reveal.configure({ pdfMaxPagesPerSlide: 1 })` ensures that no slide ever grows to more than one printed page.
-
-### Print stylesheet
-
-To enable the PDF print capability in your presentation, the special print stylesheet at [/css/print/pdf.css](https://github.com/hakimel/reveal.js/blob/master/css/print/pdf.css) must be loaded. The default index.html file handles this for you when `print-pdf` is included in the query string. If you're using a different HTML template, you can add this to your HEAD:
-
-```html
-<script>
-	var link = document.createElement( 'link' );
-	link.rel = 'stylesheet';
-	link.type = 'text/css';
-	link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
-	document.getElementsByTagName( 'head' )[0].appendChild( link );
-</script>
-```
-
-### Instructions
-
-1. Open your presentation with `print-pdf` included in the query string i.e. http://localhost:8000/?print-pdf. You can test this with [revealjs.com?print-pdf](http://revealjs.com?print-pdf).
-  * If you want to include [speaker notes](#speaker-notes) in your export, you can append `showNotes=true` to the query string: http://localhost:8000/?print-pdf&showNotes=true
-1. Open the in-browser print dialog (CTRL/CMD+P).
-1. Change the **Destination** setting to **Save as PDF**.
-1. Change the **Layout** to **Landscape**.
-1. Change the **Margins** to **None**.
-1. Enable the **Background graphics** option.
-1. Click **Save**.
-
-![Chrome Print Settings](https://s3.amazonaws.com/hakim-static/reveal-js/pdf-print-settings-2.png)
-
-Alternatively you can use the [decktape](https://github.com/astefanutti/decktape) project.
-
-
-## Theming
-
-The framework comes with a few different themes included:
-
-- black: Black background, white text, blue links (default theme)
-- white: White background, black text, blue links
-- league: Gray background, white text, blue links (default theme for reveal.js < 3.0.0)
-- beige: Beige background, dark text, brown links
-- sky: Blue background, thin dark text, blue links
-- night: Black background, thick white text, orange links
-- serif: Cappuccino background, gray text, brown links
-- simple: White background, black text, blue links
-- solarized: Cream-colored background, dark green text, blue links
-
-Each theme is available as a separate stylesheet. To change theme you will need to replace **black** below with your desired theme name in index.html:
-
-```html
-<link rel="stylesheet" href="css/theme/black.css" id="theme">
-```
-
-If you want to add a theme of your own see the instructions here: [/css/theme/README.md](https://github.com/hakimel/reveal.js/blob/master/css/theme/README.md).
-
-
-## Speaker Notes
-
-reveal.js comes with a speaker notes plugin which can be used to present per-slide notes in a separate browser window. The notes window also gives you a preview of the next upcoming slide so it may be helpful even if you haven't written any notes. Press the »S« key on your keyboard to open the notes window.
-
-A speaker timer starts as soon as the speaker view is opened. You can reset it to 00:00:00 at any time by simply clicking/tapping on it.
-
-Notes are defined by appending an `<aside>` element to a slide as seen below. You can add the `data-markdown` attribute to the aside element if you prefer writing notes using Markdown.
-
-Alternatively you can add your notes in a `data-notes` attribute on the slide. Like `<section data-notes="Something important"></section>`.
-
-When used locally, this feature requires that reveal.js [runs from a local web server](#full-setup).
-
-```html
-<section>
-	<h2>Some Slide</h2>
-
-	<aside class="notes">
-		Oh hey, these are some notes. They'll be hidden in your presentation, but you can see them if you open the speaker notes window (hit »S« on your keyboard).
-	</aside>
-</section>
-```
-
-If you're using the external Markdown plugin, you can add notes with the help of a special delimiter:
-
-```html
-<section data-markdown="example.md" data-separator="^\n\n\n" data-separator-vertical="^\n\n" data-separator-notes="^Note:"></section>
-
-# Title
-## Sub-title
-
-Here is some content...
-
-Note:
-This will only display in the notes window.
-```
-
-#### Share and Print Speaker Notes
-
-Notes are only visible to the speaker inside of the speaker view. If you wish to share your notes with others you can initialize reveal.js with the `showNotes` configuration value set to `true`. Notes will appear along the bottom of the presentations.
-
-When `showNotes` is enabled notes are also included when you [export to PDF](https://github.com/hakimel/reveal.js#pdf-export). By default, notes are printed in a box on top of the slide. If you'd rather print them on a separate page, after the slide, set `showNotes: "separate-page"`.
-
-#### Speaker notes clock and timers
-
-The speaker notes window will also show:
-
-- Time elapsed since the beginning of the presentation.  If you hover the mouse above this section, a timer reset button will appear.
-- Current wall-clock time
-- (Optionally) a pacing timer which indicates whether the current pace of the presentation is on track for the right timing (shown in green), and if not, whether the presenter should speed up (shown in red) or has the luxury of slowing down (blue).
-
-The pacing timer can be enabled by configuring the `defaultTiming` parameter in the `Reveal` configuration block, which specifies the number of seconds per slide.  120 can be a reasonable rule of thumb.  Alternatively, you can enable the timer by setting `totalTime`, which sets the total length of your presentation (also in seconds).  If both values are specified, `totalTime` wins and `defaultTiming` is ignored.  Regardless of the baseline timing method, timings can also be given per slide `<section>` by setting the `data-timing` attribute (again, in seconds).
-
-
-## Server Side Speaker Notes
-
-In some cases it can be desirable to run notes on a separate device from the one you're presenting on. The Node.js-based notes plugin lets you do this using the same note definitions as its client side counterpart. Include the required scripts by adding the following dependencies:
-
-```javascript
-Reveal.initialize({
-	// ...
-
-	dependencies: [
-		{ src: 'socket.io/socket.io.js', async: true },
-		{ src: 'plugin/notes-server/client.js', async: true }
-	]
-});
-```
-
-Then:
-
-1. Install [Node.js](http://nodejs.org/) (9.0.0 or later)
-2. Run `npm install`
-3. Run `node plugin/notes-server`
-
-
-## Plugins
-
-Plugins should register themselves with reveal.js by calling `Reveal.registerPlugin( 'myPluginID', MyPlugin )`. Registered plugin instances can optionally expose an "init" function that reveal.js will call to initialize them.
-
-When reveal.js is booted up via `Reveal.initialize()`, it will go through all registered plugins and invoke their "init" methods. If the "init" method returns a Promise, reveal.js will wait for that promise to be fulfilled before finishing the startup sequence and firing the [ready](#ready-event) event. Here's an example of a plugin that does some asynchronous work before reveal.js can proceed:
-
-```javascript
-let MyPlugin = {
-	init: () =>  new Promise( resolve => setTimeout( resolve, 3000 ) )
-};
-Reveal.registerPlugin( 'myPlugin', MyPlugin );
-Reveal.addEventListener( 'ready', () => console.log( 'Three seconds later...' ) );
-Reveal.initialize();
-```
-
-Note that reveal.js will *not* wait for init Promise fulfillment if the plugin is loaded as an [async dependency](#dependencies). If the plugin's init method does _not_ return a Promise, the plugin is considered ready right away and will not hold up the reveal.js startup sequence.
-
-### Retrieving Plugins
-
-If you want to check if a specific plugin is registered you can use the `Reveal.hasPlugin` method and pass in a plugin ID, for example: `Reveal.hasPlugin( 'myPlugin' )`. If you want to retrieve a plugin instance you can use `Reveal.getPlugin( 'myPlugin' )`.
-
-
-## Multiplexing
-
-The multiplex plugin allows your audience to view the slides of the presentation you are controlling on their own phone, tablet or laptop. As the master presentation navigates the slides, all client presentations will update in real time. See a demo at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/).
-
-The multiplex plugin needs the following 3 things to operate:
-
-1. Master presentation that has control
-2. Client presentations that follow the master
-3. Socket.io server to broadcast events from the master to the clients
-
-#### Master presentation
-
-Served from a static file server accessible (preferably) only to the presenter. This need only be on your (the presenter's) computer. (It's safer to run the master presentation from your own computer, so if the venue's Internet goes down it doesn't stop the show.) An example would be to execute the following commands in the directory of your master presentation:
-
-1. `npm install node-static`
-2. `static`
-
-If you want to use the speaker notes plugin with your master presentation then make sure you have the speaker notes plugin configured correctly along with the configuration shown below, then execute `node plugin/notes-server` in the directory of your master presentation. The configuration below will cause it to connect to the socket.io server as a master, as well as launch your speaker-notes/static-file server.
-
-You can then access your master presentation at `http://localhost:1947`
-
-Example configuration:
-
-```javascript
-Reveal.initialize({
-	// other options...
-
-	multiplex: {
-		// Example values. To generate your own, see the socket.io server instructions.
-		secret: '13652805320794272084', // Obtained from the socket.io server. Gives this (the master) control of the presentation
-		id: '1ea875674b17ca76', // Obtained from socket.io server
-		url: 'https://reveal-js-multiplex-ccjbegmaii.now.sh' // Location of socket.io server
-	},
-
-	// Don't forget to add the dependencies
-	dependencies: [
-		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js', async: true },
-		{ src: 'plugin/multiplex/master.js', async: true },
-
-		// and if you want speaker notes
-		{ src: 'plugin/notes-server/client.js', async: true }
-
-		// other dependencies...
-	]
-});
-```
-
-#### Client presentation
-
-Served from a publicly accessible static file server. Examples include: GitHub Pages, Amazon S3, Dreamhost, Akamai, etc. The more reliable, the better. Your audience can then access the client presentation via `https://example.com/path/to/presentation/client/index.html`, with the configuration below causing them to connect to the socket.io server as clients.
-
-Example configuration:
-
-```javascript
-Reveal.initialize({
-	// other options...
-
-	multiplex: {
-		// Example values. To generate your own, see the socket.io server instructions.
-		secret: null, // null so the clients do not have control of the master presentation
-		id: '1ea875674b17ca76', // id, obtained from socket.io server
-		url: 'https://reveal-js-multiplex-ccjbegmaii.now.sh' // Location of socket.io server
-	},
-
-	// Don't forget to add the dependencies
-	dependencies: [
-		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js', async: true },
-		{ src: 'plugin/multiplex/client.js', async: true }
-
-		// other dependencies...
-	]
-});
-```
-
-#### Socket.io server
-
-Server that receives the `slideChanged` events from the master presentation and broadcasts them out to the connected client presentations. This needs to be publicly accessible. You can run your own socket.io server with the commands:
-
-1. `npm install`
-2. `node plugin/multiplex`
-
-Or you can use the socket.io server at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/).
-
-You'll need to generate a unique secret and token pair for your master and client presentations. To do so, visit `https://example.com/token`, where `https://example.com` is the location of your socket.io server. Or if you're going to use the socket.io server at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/), visit [https://reveal-js-multiplex-ccjbegmaii.now.sh/token](https://reveal-js-multiplex-ccjbegmaii.now.sh/token).
-
-You are very welcome to point your presentations at the Socket.io server running at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/), but availability and stability are not guaranteed.
-
-For anything mission critical I recommend you run your own server. The easiest way to do this is by installing [now](https://zeit.co/now). With that installed, deploying your own Multiplex server is as easy running the following command from the reveal.js folder: `now plugin/multiplex`.
-
-##### socket.io server as file static server
-
-The socket.io server can play the role of static file server for your client presentation, as in the example at [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/). (Open [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/) in two browsers. Navigate through the slides on one, and the other will update to match.)
-
-Example configuration:
-
-```javascript
-Reveal.initialize({
-	// other options...
-
-	multiplex: {
-		// Example values. To generate your own, see the socket.io server instructions.
-		secret: null, // null so the clients do not have control of the master presentation
-		id: '1ea875674b17ca76', // id, obtained from socket.io server
-		url: 'example.com:80' // Location of your socket.io server
-	},
-
-	// Don't forget to add the dependencies
-	dependencies: [
-		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js', async: true },
-		{ src: 'plugin/multiplex/client.js', async: true }
-
-		// other dependencies...
-	]
-```
-
-It can also play the role of static file server for your master presentation and client presentations at the same time (as long as you don't want to use speaker notes). (Open [https://reveal-js-multiplex-ccjbegmaii.now.sh/](https://reveal-js-multiplex-ccjbegmaii.now.sh/) in two browsers. Navigate through the slides on one, and the other will update to match. Navigate through the slides on the second, and the first will update to match.) This is probably not desirable, because you don't want your audience to mess with your slides while you're presenting. ;)
-
-Example configuration:
-
-```javascript
-Reveal.initialize({
-	// other options...
-
-	multiplex: {
-		// Example values. To generate your own, see the socket.io server instructions.
-		secret: '13652805320794272084', // Obtained from the socket.io server. Gives this (the master) control of the presentation
-		id: '1ea875674b17ca76', // Obtained from socket.io server
-		url: 'example.com:80' // Location of your socket.io server
-	},
-
-	// Don't forget to add the dependencies
-	dependencies: [
-		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js', async: true },
-		{ src: 'plugin/multiplex/master.js', async: true },
-		{ src: 'plugin/multiplex/client.js', async: true }
-
-		// other dependencies...
-	]
-});
-```
-
-
-## MathJax
-
-If you want to display math equations in your presentation you can easily do so by including this plugin. The plugin is a very thin wrapper around the [MathJax](http://www.mathjax.org/) library. To use it you'll need to include it as a reveal.js dependency, [find our more about dependencies here](#dependencies).
-
-The plugin defaults to using [LaTeX](https://en.wikipedia.org/wiki/LaTeX) but that can be adjusted through the `math` configuration object. Note that MathJax is loaded from a remote server. If you want to use it offline you'll need to download a copy of the library and adjust the `mathjax` configuration value.
-
-Below is an example of how the plugin can be configured. If you don't intend to change these values you do not need to include the `math` config object at all.
-
-```js
-Reveal.initialize({
-	// other options ...
-
-	math: {
-		mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js',
-		config: 'TeX-AMS_HTML-full', // See http://docs.mathjax.org/en/latest/config-files.html
-		// pass other options into `MathJax.Hub.Config()`
-		TeX: { Macros: { RR: "{\\bf R}" } }
-	},
-
-	dependencies: [
-		{ src: 'plugin/math/math.js', async: true }
-	]
-});
-```
-
-Read MathJax's documentation if you need [HTTPS delivery](http://docs.mathjax.org/en/latest/start.html#secure-access-to-the-cdn) or serving of [specific versions](http://docs.mathjax.org/en/latest/configuration.html#loading-mathjax-from-the-cdn) for stability.
-
-#### MathJax in Markdown
-If you want to include math inside of a presentation written in Markdown you need to wrap the formula in backticks. This prevents syntax conflicts between LaTeX and Markdown. For example:
-
-```
-`$$ J(\theta_0,\theta_1) = \sum_{i=0} $$`
-```
+## Documentation
+The full reveal.js documentation is available at [revealjs.com](https://revealjs.netlify.app).
 
 ## License
 
 MIT licensed
 
-Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+Copyright (C) 2011-2020 Hakim El Hattab, https://hakim.se

bower.json

@@ -1,24 +0,0 @@
-{
-  "name": "reveal.js",
-  "version": "3.9.2",
-  "main": [
-    "js/reveal.js",
-    "css/reveal.css"
-  ],
-  "homepage": "http://revealjs.com",
-  "license": "MIT",
-  "description": "The HTML Presentation Framework",
-  "authors": [
-    "Hakim El Hattab <hakim.elhattab@gmail.com>"
-  ],
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/hakimel/reveal.js.git"
-  },
-  "ignore": [
-    "**/.*",
-    "node_modules",
-    "bower_components",
-    "test"
-  ]
-}

css/layout.scss

@@ -0,0 +1,49 @@
+/**
+ * Layout helpers.
+ */
+
+// Stretch an element vertically based on available space
+.reveal .stretch,
+.reveal .r-stretch {
+	max-width: none;
+	max-height: none;
+}
+
+.reveal pre.stretch code,
+.reveal pre.r-stretch code {
+	height: 100%;
+	max-height: 100%;
+	box-sizing: border-box;
+}
+
+// Stack multiple elements on top of each other
+.reveal .r-stack {
+	display: grid;
+}
+
+.reveal .r-stack > * {
+	grid-area: 1/1;
+	margin: auto;
+}
+
+// Horizontal and vertical stacks
+.reveal .r-vstack,
+.reveal .r-hstack {
+	display: flex;
+}
+
+.reveal .r-vstack {
+	flex-direction: column;
+}
+
+.reveal .r-hstack {
+	flex-direction: row;
+}
+
+.reveal .items-center {
+	align-items: center;
+}
+
+.reveal .justify-center {
+	justify-content: center;
+}

css/print/paper.css

@@ -1,203 +0,0 @@
-/* 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;
-	}
-
-}

css/print/paper.scss

@@ -0,0 +1,173 @@
+/* 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 {
+	html:not(.print-pdf) {
+
+		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;
+		}
+
+		.nestedarrow,
+		.controls,
+		.fork-reveal,
+		.share-reveal,
+		.state-background,
+		.reveal .progress,
+		.reveal .backgrounds,
+		.reveal .slide-number {
+			display: none !important;
+		}
+
+		body, p, td, li {
+			font-size: 20pt!important;
+			color: #000;
+		}
+
+		h1,h2,h3,h4,h5,h6 {
+			color: #000!important;
+			height: auto;
+			line-height: normal;
+			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; }
+
+		a:link,
+		a:visited {
+			color: #000 !important;
+			font-weight: bold;
+			text-decoration: underline;
+		}
+
+		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;
+		}
+		.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;
+			transform: none !important;
+
+			overflow: visible !important;
+			display: block !important;
+
+			text-align: left !important;
+			perspective: none;
+
+			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;
+
+			transform-style: flat !important;
+			transform: 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;
+
+			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;
+		}
+
+		.reveal .hljs {
+			max-height: 100%;
+			white-space: pre-wrap;
+			word-wrap: break-word;
+			word-break: break-word;
+			font-size: 15pt;
+		}
+
+		.reveal .hljs .hljs-ln-numbers {
+			white-space: nowrap;
+		}
+
+		.reveal .hljs td {
+			font-size: inherit !important;
+			color: inherit !important;
+		}
+	}
+}

css/print/pdf.css

@@ -1,165 +0,0 @@
-/**
- * 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;
-	pointer-events: initial;
-
-	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;
-}

css/print/pdf.scss

@@ -0,0 +1,172 @@
+/**
+ * This stylesheet is used to print reveal.js
+ * presentations to PDF.
+ *
+ * https://revealjs.netlify.app/pdf-export/
+ */
+
+html.print-pdf {
+	* {
+		-webkit-print-color-adjust: exact;
+	}
+
+	& {
+		width: 100%;
+		height: 100%;
+		overflow: visible;
+	}
+
+	body {
+		margin: 0 auto !important;
+		border: 0;
+		padding: 0;
+		float: none !important;
+		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;
+		pointer-events: initial;
+
+		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;
+	}
+
+	/* This accessibility tool is not useful in PDF and breaks it visually */
+	.aria-status {
+		display: none;
+	}
+}

css/reveal.scss

@@ -1,17 +1,18 @@
-/*!
+/**
  * reveal.js
  * http://revealjs.com
  * MIT licensed
  *
- * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+ * Copyright (C) Hakim El Hattab, https://hakim.se
  */
 
+@import 'layout';
 
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
 
-html {
+html.reveal-full-page {
 	width: 100%;
 	height: 100%;
 	height: 100vh;
@@ -19,7 +20,7 @@ html {
 	overflow: hidden;
 }
 
-body {
+.reveal-viewport {
 	height: 100%;
 	overflow: hidden;
 	position: relative;
@@ -39,11 +40,16 @@ body {
 	opacity: 0;
 	visibility: hidden;
 	transition: all .2s ease;
+	will-change: opacity;
 
 	&.visible {
 		opacity: 1;
 		visibility: inherit;
 	}
+
+	&.disabled {
+		transition: none;
+	}
 }
 
 .reveal .slides section .fragment.grow {
@@ -208,17 +214,6 @@ body {
 	position: relative;
 }
 
-.reveal .stretch {
-	max-width: none;
-	max-height: none;
-}
-
-.reveal pre.stretch code {
-	height: 100%;
-	max-height: 100%;
-	box-sizing: border-box;
-}
-
 
 /*********************************************
  * CONTROLS
@@ -230,6 +225,12 @@ body {
 	30% {transform: translateX(-5px);}
 }
 
+@keyframes bounce-left {
+	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);}
@@ -327,6 +328,10 @@ $controlsArrowAngleActive: 36deg;
 		right: $controlArrowSize + $controlArrowSpacing*2;
 		bottom: $controlArrowSpacing + $controlArrowSize/2;
 		transform: translateX( -10px );
+
+		&.highlight {
+			animation: bounce-left 2s 50 both ease-out;
+		}
 	}
 
 	.navigate-right {
@@ -371,7 +376,6 @@ $controlsArrowAngleActive: 36deg;
 	// 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;
 
@@ -382,7 +386,6 @@ $controlsArrowAngleActive: 36deg;
 
 	// 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;
@@ -408,6 +411,44 @@ $controlsArrowAngleActive: 36deg;
 	}
 }
 
+.reveal:not(.rtl) .controls {
+	// Back arrow style: "faded":
+	// Deemphasize left arrow
+	&[data-controls-back-arrows="faded"] .navigate-left.enabled {
+		opacity: 0.3;
+
+		&:hover {
+			opacity: 1;
+		}
+	}
+
+	// Back arrow style: "hidden":
+	// Never show left arrow
+	&[data-controls-back-arrows="hidden"] .navigate-left.enabled {
+		opacity: 0;
+		visibility: hidden;
+	}
+}
+
+.reveal.rtl .controls {
+	// Back arrow style: "faded":
+	// Deemphasize right arrow in RTL mode
+	&[data-controls-back-arrows="faded"] .navigate-right.enabled  {
+		opacity: 0.3;
+
+		&:hover {
+			opacity: 1;
+		}
+	}
+
+	// Back arrow style: "hidden":
+	// Never show right arrow in RTL mode
+	&[data-controls-back-arrows="hidden"] .navigate-right.enabled {
+		opacity: 0;
+		visibility: hidden;
+	}
+}
+
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-up,
 .reveal[data-navigation-mode="linear"].has-horizontal-slides .navigate-down {
 	display: none;
@@ -570,6 +611,11 @@ $controlsArrowAngleActive: 36deg;
 	touch-action: pinch-zoom;
 }
 
+// Swiping on an embedded deck should not block page scrolling
+.reveal.embedded {
+	touch-action: pan-y;
+}
+
 .reveal .slides {
 	position: absolute;
 	width: 100%;
@@ -652,10 +698,8 @@ $controlsArrowAngleActive: 36deg;
 }
 
 /* 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 {
+.reveal .slides>section:not(.present),
+.reveal .slides>section>section:not(.present) {
 	pointer-events: none;
 }
 
@@ -1035,47 +1079,16 @@ $controlsArrowAngleActive: 36deg;
  * 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 * {
+.reveal .no-transition *,
+.reveal .slides.disable-slide-transitions section {
 	transition: none !important;
 }
 
+.reveal .slides.disable-slide-transitions section {
+	transform: none !important;
+}
+
 
 /*********************************************
  * PER-SLIDE BACKGROUNDS
@@ -1263,6 +1276,19 @@ $controlsArrowAngleActive: 36deg;
 }
 
 
+/*********************************************
+ * AUTO ANIMATE
+ *********************************************/
+
+.reveal [data-auto-animate-target^="unmatched"] {
+	will-change: opacity;
+}
+
+.reveal section[data-auto-animate]:not(.stack):not([data-auto-animate="running"]) [data-auto-animate-target^="unmatched"] {
+	opacity: 0;
+}
+
+
 /*********************************************
  * OVERVIEW
  *********************************************/
@@ -1392,6 +1418,9 @@ $controlsArrowAngleActive: 36deg;
  * OVERLAY FOR LINK PREVIEWS AND HELP
  *********************************************/
 
+$overlayHeaderHeight: 40px;
+$overlayHeaderPadding: 5px;
+
 .reveal > .overlay {
 	position: absolute;
 	top: 0;
@@ -1400,14 +1429,8 @@ $controlsArrowAngleActive: 36deg;
 	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;
@@ -1430,14 +1453,14 @@ $controlsArrowAngleActive: 36deg;
 		left: 0;
 		top: 0;
 		width: 100%;
-		height: 40px;
+		padding: $overlayHeaderPadding;
 		z-index: 2;
-		border-bottom: 1px solid #222;
+		box-sizing: border-box;
 	}
 		.reveal > .overlay header a {
 			display: inline-block;
-			width: 40px;
-			height: 40px;
+			width: $overlayHeaderHeight;
+			height: $overlayHeaderHeight;
 			line-height: 36px;
 			padding: 0 10px;
 			float: right;
@@ -1467,7 +1490,7 @@ $controlsArrowAngleActive: 36deg;
 	.reveal > .overlay .viewport {
 		position: absolute;
 		display: flex;
-		top: 40px;
+		top: $overlayHeaderHeight + $overlayHeaderPadding*2;
 		right: 0;
 		bottom: 0;
 		left: 0;
@@ -1574,6 +1597,10 @@ $controlsArrowAngleActive: 36deg;
  * CODE HIGHLGIHTING
  *********************************************/
 
+.reveal .hljs {
+	min-height: 100%;
+}
+
 .reveal .hljs table {
 	margin: initial;
 }
@@ -1603,6 +1630,13 @@ $controlsArrowAngleActive: 36deg;
 	box-sizing: border-box;
 }
 
+.reveal pre[data-auto-animate-target] {
+	overflow: hidden;
+}
+.reveal pre[data-auto-animate-target] code {
+	height: 100%;
+}
+
 
 /*********************************************
  * ROLLING LINKS
@@ -1775,3 +1809,12 @@ $notesWidthPercent: 25%;
 .zoomed .reveal .roll span:after {
 	visibility: hidden;
 }
+
+
+/*********************************************
+ * PRINT STYLES
+ *********************************************/
+
+@import 'print/pdf.scss';
+@import 'print/paper.scss';
+

css/theme/README.md

@@ -1,10 +1,10 @@
 ## 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
+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 installed before proceeding: https://revealjs.netlify.app/installation/#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`.
+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 from Sass to CSS (see the [gulpfile](https://github.com/hakimel/reveal.js/blob/master/gulpfile.js)) when you run `npm run build -- css-themes`.
 
 Each theme file does four things in the following order:
 

css/theme/source/beige.scss

@@ -13,7 +13,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 

css/theme/source/black.scss

@@ -12,7 +12,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+@import url(fonts/source-sans-pro/source-sans-pro.css);
 
 
 // Override theme settings (see ../template/settings.scss)

css/theme/source/league.scss

@@ -15,7 +15,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/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)

css/theme/source/moon.scss

@@ -12,7 +12,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 /**

css/theme/source/solarized.scss

@@ -12,7 +12,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 
 

css/theme/source/white.scss

@@ -12,7 +12,7 @@
 
 
 // Include theme-specific fonts
-@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+@import url(fonts/source-sans-pro/source-sans-pro.css);
 
 
 // Override theme settings (see ../template/settings.scss)

css/theme/template/exposer.scss

@@ -0,0 +1,27 @@
+// Exposes theme's variables for easy re-use in CSS for plugin authors
+
+:root {
+  --background-color: #{$backgroundColor};
+  --main-font: #{$mainFont};
+  --main-font-size: #{$mainFontSize};
+  --main-color: #{$mainColor};
+  --block-margin: #{$blockMargin};
+  --heading-margin: #{$headingMargin};
+  --heading-font: #{$headingFont};
+  --heading-color: #{$headingColor};
+  --heading-line-height: #{$headingLineHeight};
+  --heading-letter-spacing: #{$headingLetterSpacing};
+  --heading-text-transform: #{$headingTextTransform};
+  --heading-text-shadow: #{$headingTextShadow};
+  --heading-font-weight: #{$headingFontWeight};
+  --heading1-text-shadow: #{$heading1TextShadow};
+  --heading1-size: #{$heading1Size};
+  --heading2-size: #{$heading2Size};
+  --heading3-size: #{$heading3Size};
+  --heading4-size: #{$heading4Size};
+  --code-font: #{$codeFont};
+  --link-color: #{$linkColor};
+  --link-color-hover: #{$linkColorHover};
+  --selection-background-color: #{$selectionBackgroundColor};
+  --selection-color: #{$selectionColor};
+}

css/theme/template/theme.scss

@@ -4,7 +4,9 @@
  * GLOBAL STYLES
  *********************************************/
 
-body {
+@import "./exposer";
+
+.reveal-viewport {
 	@include bodyBackground();
 	background-color: $backgroundColor;
 }
@@ -16,13 +18,13 @@ body {
 	color: $mainColor;
 }
 
-::selection {
+.reveal ::selection {
 	color: $selectionColor;
 	background: $selectionBackgroundColor;
 	text-shadow: none;
 }
 
-::-moz-selection {
+.reveal ::-moz-selection {
 	color: $selectionColor;
 	background: $selectionBackgroundColor;
 	text-shadow: none;
@@ -235,6 +237,10 @@ body {
 	vertical-align: top;
 }
 
+.reveal img {
+	margin: $blockMargin 0;
+}
+
 
 /*********************************************
  * LINKS
@@ -243,14 +249,10 @@ body {
 .reveal a {
 	color: $linkColor;
 	text-decoration: none;
-
-	-webkit-transition: color .15s ease;
-	   -moz-transition: color .15s ease;
-	        transition: color .15s ease;
+	transition: color .15s ease;
 }
 	.reveal a:hover {
 		color: $linkColorHover;
-
 		text-shadow: none;
 		border: none;
 	}
@@ -262,34 +264,22 @@ body {
 
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
 
-.reveal section img {
-	margin: 15px 0px;
-	background: rgba(255,255,255,0.12);
+.reveal .r-frame {
 	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;
+.reveal a .r-frame {
+	transition: all .15s linear;
+}
 
-		box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
-	}
+.reveal a:hover .r-frame {
+	border-color: $linkColor;
+	box-shadow: 0 0 20px rgba(0, 0, 0, 0.55);
+}
 
 
 /*********************************************
@@ -310,9 +300,7 @@ body {
 	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);
+		transition: width 800ms cubic-bezier(0.260, 0.860, 0.440, 0.985);
 	}
 
 /*********************************************

demo.html

@@ -14,25 +14,12 @@
 
 		<meta name="viewport" content="width=device-width, initial-scale=1.0">
 
-		<link rel="stylesheet" href="css/reset.css">
-		<link rel="stylesheet" href="css/reveal.css">
-		<link rel="stylesheet" href="css/theme/black.css" id="theme">
+		<link rel="stylesheet" href="dist/reset.css">
+		<link rel="stylesheet" href="dist/reveal.css">
+		<link rel="stylesheet" href="dist/theme/black.css" id="theme">
 
 		<!-- Theme used for syntax highlighting of code -->
-		<link rel="stylesheet" href="lib/css/monokai.css">
-
-		<!-- Printing and PDF exports -->
-		<script>
-			var link = document.createElement( 'link' );
-			link.rel = 'stylesheet';
-			link.type = 'text/css';
-			link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
-			document.getElementsByTagName( 'head' )[0].appendChild( link );
-		</script>
-
-		<!--[if lt IE 9]>
-		<script src="lib/js/html5shiv.js"></script>
-		<![endif]-->
+		<link rel="stylesheet" href="plugin/highlight/monokai.css" id="highlight-theme">
 	</head>
 
 	<body>
@@ -64,7 +51,7 @@
 						<p>Use the <em>Space</em> key to navigate through all slides.</p>
 						<br>
 						<a href="#" class="navigate-down">
-							<img width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
 						</a>
 					</section>
 					<section>
@@ -76,7 +63,7 @@
 						<p>That's it, time to go back up.</p>
 						<br>
 						<a href="#/2">
-							<img width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Up arrow" style="transform: rotate(180deg); -webkit-transform: rotate(180deg);">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1); transform: rotate(180deg);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Up arrow">
 						</a>
 					</section>
 				</section>
@@ -88,6 +75,55 @@
 					</p>
 				</section>
 
+				<section data-auto-animate>
+					<h2 data-id="code-title">Pretty Code</h2>
+					<pre data-id="code-animation"><code class="hljs" data-trim data-line-numbers>
+						import React, { useState } from 'react';
+
+						function Example() {
+						  const [count, setCount] = useState(0);
+
+						  return (
+						    ...
+						  );
+						}
+					</code></pre>
+					<p>Code syntax highlighting courtesy of <a href="https://highlightjs.org/usage/">highlight.js</a>.</p>
+				</section>
+
+				<section data-auto-animate>
+					<h2 data-id="code-title">With animations</h2>
+					<pre data-id="code-animation"><code class="hljs" data-trim data-line-numbers="|4,8-11|17|22-24">
+						import React, { useState } from 'react';
+
+						function Example() {
+						  const [count, setCount] = useState(0);
+
+						  return (
+						    &lt;div&gt;
+						      &lt;p&gt;You clicked {count} times&lt;/p&gt;
+						      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+						        Click me
+						      &lt;/button&gt;
+						    &lt;/div&gt;
+						  );
+						}
+
+						function SecondExample() {
+						  const [count, setCount] = useState(0);
+
+						  return (
+						    &lt;div&gt;
+						      &lt;p&gt;You clicked {count} times&lt;/p&gt;
+						      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+						        Click me
+						      &lt;/button&gt;
+						    &lt;/div&gt;
+						  );
+						}
+					</code></pre>
+				</section>
+
 				<section>
 					<h2>Point of View</h2>
 					<p>
@@ -101,6 +137,32 @@
 					</p>
 				</section>
 
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<h2>Auto-Animate</h2>
+					<p>Automatically animate matching elements across slides with <a href="https://revealjs.netlify.app/auto-animate/">Auto-Animate</a>.</p>
+					<div class="r-hstack justify-center">
+						<div data-id="box1" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+						<div data-id="box2" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+						<div data-id="box3" style="background: #999; width: 50px; height: 50px; margin: 10px; border-radius: 5px;"></div>
+					</div>
+				</section>
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<div class="r-hstack justify-center">
+						<div data-id="box1" data-auto-animate-delay="0" style="background: cyan; width: 150px; height: 100px; margin: 10px;"></div>
+						<div data-id="box2" data-auto-animate-delay="0.1" style="background: magenta; width: 150px; height: 100px; margin: 10px;"></div>
+						<div data-id="box3" data-auto-animate-delay="0.2" style="background: yellow; width: 150px; height: 100px; margin: 10px;"></div>
+					</div>
+					<h2 style="margin-top: 20px;">Auto-Animate</h2>
+				</section>
+				<section data-auto-animate data-auto-animate-easing="cubic-bezier(0.770, 0.000, 0.175, 1.000)">
+					<div class="r-stack">
+						<div data-id="box1" style="background: cyan; width: 300px; height: 300px; border-radius: 200px;"></div>
+						<div data-id="box2" style="background: magenta; width: 200px; height: 200px; border-radius: 200px;"></div>
+						<div data-id="box3" style="background: yellow; width: 100px; height: 100px; border-radius: 200px;"></div>
+					</div>
+					<h2 style="margin-top: 20px;">Auto-Animate</h2>
+				</section>
+
 				<section>
 					<h2>Touch Optimized</h2>
 					<p>
@@ -113,14 +175,14 @@
 						## Markdown support
 
 						Write content using inline or external Markdown.
-						Instructions and more info available in the [readme](https://github.com/hakimel/reveal.js#markdown).
+						Instructions and more info available in the [readme](https://revealjs.netlify.app/markdown/).
 
-						```
+						```[]
 						<section data-markdown>
 						  ## Markdown support
 
 						  Write content using inline or external Markdown.
-						  Instructions and more info available in the [readme](https://github.com/hakimel/reveal.js#markdown).
+						  Instructions and more info available in the [readme](https://revealjs.netlify.app/markdown/).
 						</section>
 						```
 					</script>
@@ -194,7 +256,7 @@
 							Set <code>data-background="#dddddd"</code> on a slide to change the background color. All CSS color formats are supported.
 						</p>
 						<a href="#" class="navigate-down">
-							<img width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
+							<img class="r-frame" style="background: rgba(255,255,255,0.1);" width="178" height="238" data-src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
 						</a>
 					</section>
 					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/image-placeholder.png">
@@ -239,27 +301,6 @@
 					</div>
 				</section>
 
-				<section>
-					<h2>Pretty Code</h2>
-					<pre><code class="hljs" data-trim data-line-numbers="4|9|4,8-11">
-import React, { useState } from 'react';
-
-function Example() {
-  const [count, setCount] = useState(0);
-
-  return (
-    &lt;div&gt;
-      &lt;p&gt;You clicked {count} times&lt;/p&gt;
-      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
-        Click me
-      &lt;/button&gt;
-    &lt;/div&gt;
-  );
-}
-					</code></pre>
-					<p>Code syntax highlighting courtesy of <a href="http://softwaremaniacs.org/soft/highlight/en/description/">highlight.js</a>.</p>
-				</section>
-
 				<section>
 					<h2>Marvelous List</h2>
 					<ul>
@@ -330,7 +371,7 @@ function Example() {
 
 				<section>
 					<h2>Speaker View</h2>
-					<p>There's a <a href="https://github.com/hakimel/reveal.js#speaker-notes">speaker view</a>. It includes a timer, preview of the upcoming slide as well as your speaker notes.</p>
+					<p>There's a <a href="https://revealjs.netlify.app/speaker-view/">speaker view</a>. It includes a timer, preview of the upcoming slide as well as your speaker notes.</p>
 					<p>Press the <em>S</em> key to try it out.</p>
 
 					<aside class="notes">
@@ -340,7 +381,7 @@ function Example() {
 
 				<section>
 					<h2>Export to PDF</h2>
-					<p>Presentations can be <a href="https://github.com/hakimel/reveal.js#pdf-export">exported to PDF</a>, here's an example:</p>
+					<p>Presentations can be <a href="https://revealjs.netlify.app/pdf-export/">exported to PDF</a>, here's an example:</p>
 					<iframe data-src="https://www.slideshare.net/slideshow/embed_code/42840540" width="445" height="355" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:3px solid #666; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>
 				</section>
 
@@ -359,7 +400,7 @@ function Example() {
 						Additionally custom events can be triggered on a per slide basis by binding to the <code>data-state</code> name.
 					</p>
 					<pre><code class="javascript" data-trim contenteditable style="font-size: 18px;">
-Reveal.addEventListener( 'customevent', function() {
+Reveal.on( 'customevent', function() {
 	console.log( '"customevent" has fired' );
 } );
 					</code></pre>
@@ -376,10 +417,10 @@ Reveal.addEventListener( 'customevent', function() {
 					<h2>Much more</h2>
 					<ul>
 						<li>Right-to-left support</li>
-						<li><a href="https://github.com/hakimel/reveal.js#api">Extensive JavaScript API</a></li>
-						<li><a href="https://github.com/hakimel/reveal.js#auto-sliding">Auto-progression</a></li>
-						<li><a href="https://github.com/hakimel/reveal.js#parallax-background">Parallax backgrounds</a></li>
-						<li><a href="https://github.com/hakimel/reveal.js#keyboard-bindings">Custom keyboard bindings</a></li>
+						<li><a href="https://revealjs.netlify.app/api/">Extensive JavaScript API</a></li>
+						<li><a href="https://revealjs.netlify.app/auto-slide/">Auto-progression</a></li>
+						<li><a href="https://revealjs.netlify.app/backgrounds/#parallax-background">Parallax backgrounds</a></li>
+						<li><a href="https://revealjs.netlify.app/keyboard/">Custom keyboard bindings</a></li>
 					</ul>
 				</section>
 
@@ -395,28 +436,24 @@ Reveal.addEventListener( 'customevent', function() {
 
 		</div>
 
-		<script src="js/reveal.js"></script>
-
+		<script src="dist/reveal.js"></script>
+		<script src="plugin/zoom/zoom.js"></script>
+		<script src="plugin/notes/notes.js"></script>
+		<script src="plugin/search/search.js"></script>
+		<script src="plugin/markdown/markdown.js"></script>
+		<script src="plugin/highlight/highlight.js"></script>
 		<script>
 
-			// More info https://github.com/hakimel/reveal.js#configuration
+			// Also available as an ES module, see:
+			// https://revealjs.netlify.app/initialization/
 			Reveal.initialize({
 				controls: true,
 				progress: true,
 				center: true,
 				hash: true,
 
-				transition: 'slide', // none/fade/slide/convex/concave/zoom
-
-				// More info https://github.com/hakimel/reveal.js#dependencies
-				dependencies: [
-					{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-					{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-					{ src: 'plugin/highlight/highlight.js' },
-					{ src: 'plugin/search/search.js', async: true },
-					{ src: 'plugin/zoom-js/zoom.js', async: true },
-					{ src: 'plugin/notes/notes.js', async: true }
-				]
+				// Learn about plugins: https://revealjs.netlify.app/plugins/
+				plugins: [ RevealZoom, RevealNotes, RevealSearch, RevealMarkdown, RevealHighlight ]
 			});
 
 		</script>

css/theme/beige.css → dist/theme/beige.css

@@ -3,12 +3,37 @@
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #f7f3de;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #333;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #333;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-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);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #8b743d;
+  --link-color-hover: #c0a86e;
+  --selection-background-color: rgba(79, 64, 28, 0.99);
+  --selection-color: #fff; }
+
+.reveal-viewport {
   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));
@@ -24,12 +49,12 @@ body {
   font-weight: normal;
   color: #333; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: rgba(79, 64, 28, 0.99);
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: rgba(79, 64, 28, 0.99);
   text-shadow: none; }
@@ -209,14 +234,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -229,25 +255,16 @@ body {
   background: #564826; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #8b743d;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -265,8 +282,6 @@ body {
   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); }
 
 /*********************************************

css/theme/black.css → dist/theme/black.css

@@ -3,14 +3,39 @@
  *
  * By Hakim El Hattab, http://hakim.se
  */
-@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+@import url(fonts/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 {
+:root {
+  --background-color: #191919;
+  --main-font: Source Sans Pro, Helvetica, sans-serif;
+  --main-font-size: 42px;
+  --main-color: #fff;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --heading-color: #fff;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: 600;
+  --heading1-text-shadow: none;
+  --heading1-size: 2.5em;
+  --heading2-size: 1.6em;
+  --heading3-size: 1.3em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #42affa;
+  --link-color-hover: #8dcffc;
+  --selection-background-color: #bee4fd;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #191919;
   background-color: #191919; }
 
@@ -20,12 +45,12 @@ body {
   font-weight: normal;
   color: #fff; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #bee4fd;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #bee4fd;
   text-shadow: none; }
@@ -205,14 +230,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -225,25 +251,16 @@ body {
   background: #068de9; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #42affa;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -261,8 +278,6 @@ body {
   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); }
 
 /*********************************************

css/theme/blood.css → dist/theme/blood.css

@@ -13,7 +13,32 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #222;
+  --main-font: Ubuntu, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Ubuntu, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: 2px 2px 2px #222;
+  --heading-font-weight: normal;
+  --heading1-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);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #a23;
+  --link-color-hover: #dd5566;
+  --selection-background-color: #a23;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #222;
   background-color: #222; }
 
@@ -23,12 +48,12 @@ body {
   font-weight: normal;
   color: #eee; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #a23;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #a23;
   text-shadow: none; }
@@ -208,14 +233,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -228,25 +254,16 @@ body {
   background: #6a1520; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #a23;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -264,8 +281,6 @@ body {
   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); }
 
 /*********************************************

css/theme/league.css → dist/theme/league.css

@@ -5,12 +5,37 @@
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #2b2b2b;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
+  --heading-font-weight: normal;
+  --heading1-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);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #13DAEC;
+  --link-color-hover: #71e9f4;
+  --selection-background-color: #FF5E99;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   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));
@@ -26,12 +51,12 @@ body {
   font-weight: normal;
   color: #eee; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #FF5E99;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #FF5E99;
   text-shadow: none; }
@@ -211,14 +236,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -231,25 +257,16 @@ body {
   background: #0d99a5; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #13DAEC;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -267,8 +284,6 @@ body {
   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); }
 
 /*********************************************

css/theme/moon.css → dist/theme/moon.css

@@ -2,7 +2,7 @@
  * Solarized Dark theme for reveal.js.
  * Author: Achim Staebler
  */
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized colors by Ethan Schoonover
@@ -14,7 +14,32 @@ html * {
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #002b36;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #93a1a1;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #eee8d5;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #268bd2;
+  --link-color-hover: #78b9e6;
+  --selection-background-color: #d33682;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #002b36;
   background-color: #002b36; }
 
@@ -24,12 +49,12 @@ body {
   font-weight: normal;
   color: #93a1a1; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #d33682;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #d33682;
   text-shadow: none; }
@@ -209,14 +234,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -229,25 +255,16 @@ body {
   background: #1a6091; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #268bd2;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -265,8 +282,6 @@ body {
   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); }
 
 /*********************************************

css/theme/night.css → dist/theme/night.css

@@ -8,7 +8,32 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #111;
+  --main-font: Open Sans, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Montserrat, Impact, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: -0.03em;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #e7ad52;
+  --link-color-hover: #f3d7ac;
+  --selection-background-color: #e7ad52;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #111;
   background-color: #111; }
 
@@ -18,12 +43,12 @@ body {
   font-weight: normal;
   color: #eee; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #e7ad52;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #e7ad52;
   text-shadow: none; }
@@ -203,14 +228,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -223,25 +249,16 @@ body {
   background: #d08a1d; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #e7ad52;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -259,8 +276,6 @@ body {
   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); }
 
 /*********************************************

css/theme/serif.css → dist/theme/serif.css

@@ -10,7 +10,32 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #F0F1EB;
+  --main-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --main-font-size: 40px;
+  --main-color: #000;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --heading-color: #383D3D;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #51483D;
+  --link-color-hover: #8b7c69;
+  --selection-background-color: #26351C;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #F0F1EB;
   background-color: #F0F1EB; }
 
@@ -20,12 +45,12 @@ body {
   font-weight: normal;
   color: #000; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #26351C;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #26351C;
   text-shadow: none; }
@@ -205,14 +230,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -225,25 +251,16 @@ body {
   background: #25211c; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #51483D;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -261,8 +278,6 @@ body {
   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); }
 
 /*********************************************

css/theme/simple.css → dist/theme/simple.css

@@ -13,7 +13,32 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #fff;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #000;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: News Cycle, Impact, sans-serif;
+  --heading-color: #000;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #00008B;
+  --link-color-hover: #0000f1;
+  --selection-background-color: rgba(0, 0, 0, 0.99);
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #fff;
   background-color: #fff; }
 
@@ -23,12 +48,12 @@ body {
   font-weight: normal;
   color: #000; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: rgba(0, 0, 0, 0.99);
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: rgba(0, 0, 0, 0.99);
   text-shadow: none; }
@@ -208,14 +233,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -228,25 +254,16 @@ body {
   background: #00003f; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #00008B;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -264,8 +281,6 @@ body {
   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); }
 
 /*********************************************

css/theme/sky.css → dist/theme/sky.css

@@ -11,7 +11,32 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #f7fbfc;
+  --main-font: Open Sans, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #333;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Quicksand, sans-serif;
+  --heading-color: #333;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: -0.08em;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #3b759e;
+  --link-color-hover: #74a7cb;
+  --selection-background-color: #134674;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   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));
@@ -27,12 +52,12 @@ body {
   font-weight: normal;
   color: #333; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #134674;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #134674;
   text-shadow: none; }
@@ -212,14 +237,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -232,25 +258,16 @@ body {
   background: #264c66; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #3b759e;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -268,8 +285,6 @@ body {
   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); }
 
 /*********************************************

css/theme/solarized.css → dist/theme/solarized.css

@@ -2,7 +2,7 @@
  * Solarized Light theme for reveal.js.
  * Author: Achim Staebler
  */
-@import url(../../lib/font/league-gothic/league-gothic.css);
+@import url(fonts/league-gothic/league-gothic.css);
 @import url(https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
 /**
  * Solarized colors by Ethan Schoonover
@@ -14,7 +14,32 @@ html * {
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
-body {
+:root {
+  --background-color: #fdf6e3;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #657b83;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #586e75;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #268bd2;
+  --link-color-hover: #78b9e6;
+  --selection-background-color: #d33682;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #fdf6e3;
   background-color: #fdf6e3; }
 
@@ -24,12 +49,12 @@ body {
   font-weight: normal;
   color: #657b83; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #d33682;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #d33682;
   text-shadow: none; }
@@ -209,14 +234,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -229,25 +255,16 @@ body {
   background: #1a6091; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #268bd2;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -265,8 +282,6 @@ body {
   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); }
 
 /*********************************************

css/theme/white.css → dist/theme/white.css

@@ -3,14 +3,39 @@
  *
  * By Hakim El Hattab, http://hakim.se
  */
-@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+@import url(fonts/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 {
+:root {
+  --background-color: #fff;
+  --main-font: Source Sans Pro, Helvetica, sans-serif;
+  --main-font-size: 42px;
+  --main-color: #222;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --heading-color: #222;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: 600;
+  --heading1-text-shadow: none;
+  --heading1-size: 2.5em;
+  --heading2-size: 1.6em;
+  --heading3-size: 1.3em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #2a76dd;
+  --link-color-hover: #6ca0e8;
+  --selection-background-color: #98bdef;
+  --selection-color: #fff; }
+
+.reveal-viewport {
   background: #fff;
   background-color: #fff; }
 
@@ -20,12 +45,12 @@ body {
   font-weight: normal;
   color: #222; }
 
-::selection {
+.reveal ::selection {
   color: #fff;
   background: #98bdef;
   text-shadow: none; }
 
-::-moz-selection {
+.reveal ::-moz-selection {
   color: #fff;
   background: #98bdef;
   text-shadow: none; }
@@ -205,14 +230,15 @@ body {
 .reveal small * {
   vertical-align: top; }
 
+.reveal img {
+  margin: 20px 0; }
+
 /*********************************************
  * 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 {
@@ -225,25 +251,16 @@ body {
   background: #1a53a1; }
 
 /*********************************************
- * IMAGES
+ * Frame helper
  *********************************************/
-.reveal section img {
-  margin: 15px 0px;
-  background: rgba(255, 255, 255, 0.12);
+.reveal .r-frame {
   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;
+.reveal a .r-frame {
   transition: all .15s linear; }
 
-.reveal a:hover img {
-  background: rgba(255, 255, 255, 0.2);
+.reveal a:hover .r-frame {
   border-color: #2a76dd;
   box-shadow: 0 0 20px rgba(0, 0, 0, 0.55); }
 
@@ -261,8 +278,6 @@ body {
   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); }
 
 /*********************************************

examples/auto-animate.html

@@ -0,0 +1,176 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Auto Animate</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/black.css" id="theme">
+		<link rel="stylesheet" href="../plugin/highlight/monokai.css">
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section data-auto-animate data-auto-animate-unmatched="fade">
+					<h3>Auto-Animate Example</h3>
+					<p>This will fade out</p>
+					<img src="assets/image1.png" style="height: 100px;">
+					<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
+						function Example() {
+						  const [count, setCount] = useState(0);
+						}
+					</code></pre>
+				</section>
+				<section data-auto-animate data-auto-animate-unmatched="fade">
+					<h3>Auto-Animate Example</h3>
+					<p style="opacity: 0.2; margin-top: 100px;">This will fade out</p>
+					<p>This element is unmatched</p>
+					<img src="assets/image1.png" style="height: 150px;">
+					<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
+						function Example() {
+						  New line!
+						  const [count, setCount] = useState(0);
+						}
+					</code></pre>
+				</section>
+
+				<section data-auto-animate>
+					<p data-id="text-props" style="background: #555; line-height: 1em; letter-spacing: 0em;">Line Height & Letter Spacing</p>
+				</section>
+				<section data-auto-animate>
+					<p data-id="text-props" style="background: #555; line-height: 3em; letter-spacing: 0.2em;">Line Height & Letter Spacing</p>
+				</section>
+
+				<section>
+					<section data-auto-animate>
+						<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
+							import React, { useState } from 'react';
+
+							function Example() {
+							  const [count, setCount] = useState(0);
+
+							  return (
+							    ...
+							  );
+							}
+						</code></pre>
+					</section>
+					<section data-auto-animate>
+						<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
+							function Example() {
+							  const [count, setCount] = useState(0);
+
+							  return (
+							    &lt;div&gt;
+							      &lt;p&gt;You clicked {count} times&lt;/p&gt;
+							      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+							        Click me
+							      &lt;/button&gt;
+							    &lt;/div&gt;
+							  );
+							}
+						</code></pre>
+					</section>
+					<section data-auto-animate>
+						<pre data-id="code"><code data-line-numbers class="hljs" data-trim>
+							function Example() {
+							  // A comment!
+							  const [count, setCount] = useState(0);
+
+							  return (
+							    &lt;div&gt;
+							      &lt;p&gt;You clicked {count} times&lt;/p&gt;
+							      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;
+							        Click me
+							      &lt;/button&gt;
+							    &lt;/div&gt;
+							  );
+							}
+						</code></pre>
+					</section>
+				</section>
+
+				<section>
+					<section data-auto-animate>
+						<h3>Swapping list items</h3>
+						<ul>
+							<li>One</li>
+							<li>Two</li>
+							<li>Three</li>
+						</ul>
+					</section>
+					<section data-auto-animate>
+						<h3>Swapping list items</h3>
+						<ul>
+							<li>Two</li>
+							<li>One</li>
+							<li>Three</li>
+						</ul>
+					</section>
+					<section data-auto-animate>
+						<h3>Swapping list items</h3>
+						<ul>
+							<li>Two</li>
+							<li>Three</li>
+							<li>One</li>
+						</ul>
+					</section>
+				</section>
+
+				<section data-auto-animate style="height: 600px">
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 1</h2>
+					<h2 data-id="title" style="margin-top: 260px;">Animate Anything</h2>
+					<div data-id="1" style="background: white; position: absolute; top: 150px; left: 16%; width: 60px; height: 60px;"></div>
+					<div data-id="2" style="background: white; position: absolute; top: 150px; left: 36%; width: 60px; height: 60px;"></div>
+					<div data-id="3" style="background: white; position: absolute; top: 150px; left: 56%; width: 60px; height: 60px;"></div>
+					<div data-id="4" style="background: white; position: absolute; top: 150px; left: 76%; width: 60px; height: 60px;"></div>
+				</section>
+				<section data-auto-animate style="height: 600px">
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 2</h2>
+					<h2 data-id="title" style="margin-top: 500px">With Auto Animate</h2>
+					<div data-id="1" style="background: cyan; position: absolute; bottom: 190px; left: 16%; width: 60px; height: 60px;"></div>
+					<div data-id="2" style="background: magenta; position: absolute; bottom: 190px; left: 36%; width: 60px; height: 160px;"></div>
+					<div data-id="3" style="background: yellow; position: absolute; bottom: 190px; left: 56%; width: 60px; height: 260px;"></div>
+					<div data-id="4" style="background: red; position: absolute; bottom: 190px; left: 76%; width: 60px; height: 360px;"></div>
+				</section>
+				<section data-auto-animate style="height: 600px">
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h2>
+					<h2 data-id="title" style="margin-top: 500px; opacity: 0;">With Auto Animate</h2>
+					<div data-id="1" style="background: cyan; position: absolute; top: 50%; left: 50%; width: 400px; height: 400px; margin: -200px 0 0 -200px; border-radius: 400px;"></div>
+					<div data-id="2" style="background: magenta; position: absolute; top: 50%; left: 50%; width: 300px; height: 300px; margin: -150px 0 0 -150px; border-radius: 400px;"></div>
+					<div data-id="3" style="background: yellow; position: absolute; top: 50%; left: 50%; width: 200px; height: 200px; margin: -100px 0 0 -100px; border-radius: 400px;"></div>
+					<div data-id="4" style="background: red; position: absolute; top: 50%; left: 50%; width: 100px; height: 100px; margin: -50px 0 0 -50px; border-radius: 400px;"></div>
+				</section>
+				<section data-auto-animate style="height: 600px">
+					<h3 style="opacity: 0.3; font-size: 18px;">SLIDE 3</h2>
+					<h2 data-id="title" style="margin-top: 500px; opacity: 0;">With Auto Animate</h2>
+					<div data-id="1" style="background: red; position: absolute; top: 250px; left: 16%; width: 60px; height: 60px;"></div>
+					<div data-id="2" style="background: yellow; position: absolute; top: 250px; left: 36%; width: 60px; height: 60px;"></div>
+					<div data-id="3" style="background: magenta; position: absolute; top: 250px; left: 56%; width: 60px; height: 60px;"></div>
+					<div data-id="4" style="background: cyan; position: absolute; top: 250px; left: 76%; width: 60px; height: 60px;"></div>
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script src="../plugin/highlight/highlight.js"></script>
+		<script>
+			Reveal.initialize({
+				center: true,
+				hash: true,
+				plugins: [ RevealHighlight ]
+			});
+		</script>
+
+	</body>
+</html>

test/examples/barebones.html → examples/barebones.html

@@ -1,18 +1,13 @@
 <!doctype html>
 <html lang="en">
-
 	<head>
 		<meta charset="utf-8">
-
 		<title>reveal.js - Barebones</title>
-
-		<link rel="stylesheet" href="../../css/reveal.css">
+		<link rel="stylesheet" href="../dist/reveal.css">
 	</head>
-
 	<body>
 
 		<div class="reveal">
-
 			<div class="slides">
 
 				<section>
@@ -26,15 +21,11 @@
 				</section>
 
 			</div>
-
 		</div>
 
-		<script src="../../js/reveal.js"></script>
-
+		<script src="../dist/reveal.js"></script>
 		<script>
-
 			Reveal.initialize();
-
 		</script>
 
 	</body>

examples/layout-helpers.html

@@ -0,0 +1,92 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Layout Helpers</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
+		<link rel="stylesheet" href="../plugin/highlight/monokai.css">
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section>
+					<h2>Layout Helper Examples</h2>
+					<ul>
+						<li><a href="#/stretch">Stretch</a></li>
+						<li><a href="#/stack">Stack</a></li>
+					</ul>
+				</section>
+
+				<section id="stretch">
+					<h2>Stretch</h2>
+					<p>Makes an element as tall as possible while remaining within the slide bounds.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <h2>Stretch Example</h2>
+					  <img src="assets/image2.png" class="r-stretch">
+					  <p>Image byline</p>
+					</code></pre>
+				</section>
+
+				<section>
+					<h2>Stretch Example</h2>
+					<img src="assets/image2.png" class="r-stretch">
+					<p>Image byline</p>
+				</section>
+
+				<section id="stack">
+					<h2>Stack</h2>
+					<p>Stacks multiple elements on top of each other, for use with fragments.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <div class="r-stack">
+					    &lt;img class="fragment" width="450" height="300" src="..."&gt;
+					    &lt;img class="fragment" width="300" height="450" src="..."&gt;
+					    &lt;img class="fragment" width="400" height="400" src="..."&gt;
+					  </div>
+					</code></pre>
+				</section>
+
+				<section>
+					<h2>Stack Example</h2>
+					<div class="r-stack">
+						<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment">
+						<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment">
+						<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment">
+					</div>
+				</section>
+
+				<section>
+					<h2>Stack Example</h2>
+					<p>One at a time.</p>
+					<div class="r-stack">
+						<img src="https://placekitten.com/450/300" width="450" height="300" class="fragment fade-out" data-fragment-index="0">
+						<img src="https://placekitten.com/300/450" width="300" height="450" class="fragment current-visible" data-fragment-index="0">
+						<img src="https://placekitten.com/400/400" width="400" height="400" class="fragment">
+					</div>
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script src="../plugin/highlight/highlight.js"></script>
+		<script>
+			Reveal.initialize({
+				center: true,
+				hash: true,
+				plugins: [ RevealHighlight ]
+			});
+		</script>
+
+	</body>
+</html>

plugin/markdown/example.html → examples/markdown.html

@@ -4,12 +4,12 @@
 	<head>
 		<meta charset="utf-8">
 
-		<title>reveal.js - Markdown Demo</title>
+		<title>reveal.js - Markdown Example</title>
 
-		<link rel="stylesheet" href="../../css/reveal.css">
-		<link rel="stylesheet" href="../../css/theme/white.css" id="theme">
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
 
-        <link rel="stylesheet" href="../../lib/css/monokai.css">
+        <link rel="stylesheet" href="../plugin/highlight/monokai.css">
 	</head>
 
 	<body>
@@ -19,7 +19,7 @@
 			<div class="slides">
 
                 <!-- Use external markdown resource, separate slides by three newlines; vertical slides by two newlines -->
-                <section data-markdown="example.md" data-separator="^\n\n\n" data-separator-vertical="^\n\n"></section>
+                <section data-markdown="markdown.md" data-separator="^\n\n\n" data-separator-vertical="^\n\n"></section>
 
                 <!-- Slides are separated by three dashes (quick 'n dirty regular expression) -->
                 <section data-markdown data-separator="---">
@@ -88,7 +88,7 @@
                 <!-- Code -->
                 <section data-markdown>
                     <script type="text/template">
-                        ```php
+                        ```php [1|3-5]
                         public function foo()
                         {
                             $foo = array(
@@ -109,7 +109,10 @@
             </div>
 		</div>
 
-		<script src="../../js/reveal.js"></script>
+		<script src="../dist/reveal.js"></script>
+        <script src="../plugin/markdown/markdown.js"></script>
+        <script src="../plugin/highlight/highlight.js"></script>
+        <script src="../plugin/notes/notes.js"></script>
 
 		<script>
 
@@ -119,13 +122,7 @@
 				history: true,
 				center: true,
 
-				// Optional libraries used to extend on reveal.js
-				dependencies: [
-					{ src: 'marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-                    { src: 'markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-                    { src: '../highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
-					{ src: '../notes/notes.js' }
-				]
+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
 			});
 
 		</script>

test/examples/math.html → examples/math.html

@@ -8,8 +8,8 @@
 
 		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 
-		<link rel="stylesheet" href="../../css/reveal.css">
-		<link rel="stylesheet" href="../../css/theme/night.css" id="theme">
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/night.css" id="theme">
 	</head>
 
 	<body>
@@ -175,10 +175,8 @@
 
 		</div>
 
-		<script src="../../js/reveal.js"></script>
-
+		<script src="../dist/reveal.js"></script>
 		<script>
-
 			Reveal.initialize({
 				history: true,
 				transition: 'linear',
@@ -195,10 +193,9 @@
 				},
 
 				dependencies: [
-					{ src: '../../plugin/math/math.js', async: true }
+					{ src: '../plugin/math/math.js', async: true }
 				]
 			});
-
 		</script>
 
 	</body>

examples/media.html

@@ -0,0 +1,56 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Video, Audio and Iframes</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
+	</head>
+
+	<body>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section>
+					<h2>Examples of embedded Video, Audio and Iframes</h2>
+				</section>
+
+				<section>
+					<h2>Iframe</h2>
+					<iframe data-autoplay width="700" height="540" src="https://slides.com/news/auto-animate/embed" frameborder="0"></iframe>
+				</section>
+
+				<section data-background-iframe="https://www.youtube.com/embed/h1_nyI3z8gI" data-background-interactive>
+					<h2 style="color: #fff;">Iframe Background</h2>
+				</section>
+
+				<section>
+					<h2>Auto-playing audio</h2>
+					<audio src="assets/beeping.wav" data-autoplay></audio>
+				</section>
+
+				<section>
+					<h2>Audio with controls</h2>
+					<audio src="assets/beeping.wav" controls></audio>
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script>
+			Reveal.initialize({
+				transition: 'linear'
+			});
+		</script>
+
+	</body>
+</html>

examples/multiple-presentations.html

@@ -0,0 +1,102 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Multiple Presentations</title>
+
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
+		<link rel="stylesheet" href="../plugin/highlight/monokai.css">
+	</head>
+
+	<body style="background: #ddd;">
+
+		<div style="display: flex; flex-direction: row;">
+			<div class="reveal deck1" style="width: 100%; height: 50vh; margin: 10px;">
+				<div class="slides">
+					<section>Deck 1, Slide 1</section>
+					<section>Deck 1, Slide 2</section>
+					<section>
+						<pre data-id="code-animation"><code class="hljs" data-trim data-line-numbers>
+							import React, { useState } from 'react';
+							function Example() {
+							  const [count, setCount] = useState(0);
+							}
+						</code></pre>
+					</section>
+				</div>
+			</div>
+
+			<div class="reveal deck2" style="width: 100%; height: 50vh; margin: 10px;">
+				<div class="slides">
+					<section>Deck 2, Slide 1</section>
+					<section>Deck 2, Slide 2</section>
+					<section data-markdown>
+						<script type="text/template">
+							## Markdown plugin
+
+							- 1
+							- 2
+							- 3
+						</script>
+					</section>
+					<section>
+						<h3>The Lorenz Equations</h3>
+
+						\[\begin{aligned}
+						\dot{x} &amp; = \sigma(y-x) \\
+						\dot{y} &amp; = \rho x - y - xz \\
+						\dot{z} &amp; = -\beta z + xy
+						\end{aligned} \]
+					</section>
+				</div>
+			</div>
+		</div>
+
+		<style>
+			.reveal {
+				border: 4px solid #ccc;
+			}
+			.reveal.focused {
+				border-color: #94b5ff;
+			}
+		</style>
+
+		<script src="../dist/reveal.js"></script>
+		<script src="../plugin/highlight/highlight.js"></script>
+		<script src="../plugin/markdown/markdown.js"></script>
+		<script src="../plugin/math/math.js"></script>
+		<script>
+
+			let deck1 = new Reveal( document.querySelector( '.deck1' ), {
+				embedded: true,
+				progress: false,
+				keyboardCondition: 'focused',
+				plugins: [ RevealHighlight ]
+			} );
+			deck1.on( 'slidechanged', () => {
+				console.log( 'Deck 1 slide changed' );
+			} );
+			deck1.initialize();
+
+			let deck2 = new Reveal( document.querySelector( '.deck2' ), {
+				embedded: true,
+				progress: false,
+				keyboardCondition: 'focused',
+				plugins: [ RevealMarkdown, RevealMath ]
+			} );
+			deck2.initialize().then( () => {
+				deck2.slide(1);
+			} );
+			deck2.on( 'slidechanged', () => {
+				console.log( 'Deck 2 slide changed' );
+			} );
+
+		</script>
+
+	</body>
+</html>

test/examples/slide-backgrounds.html → examples/slide-backgrounds.html

@@ -8,8 +8,8 @@
 
 		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 
-		<link rel="stylesheet" href="../../css/reveal.css">
-		<link rel="stylesheet" href="../../css/theme/serif.css" id="theme">
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/serif.css" id="theme">
 		<style type="text/css" media="screen">
 			.slides section.has-dark-background,
 			.slides section.has-dark-background h2 {
@@ -122,15 +122,13 @@
 
 		</div>
 
-		<script src="../../js/reveal.js"></script>
-
+		<script src="../dist/reveal.js"></script>
 		<script>
 
-			// Full list of configuration options available here:
-			// https://github.com/hakimel/reveal.js#configuration
+			// Full list of configuration options:
+			// https://revealjs.netlify.app/config/
 			Reveal.initialize({
 				center: true,
-				// rtl: true,
 
 				transition: 'linear',
 				// transitionSpeed: 'slow',

test/examples/slide-transitions.html → examples/slide-transitions.html

@@ -6,8 +6,8 @@
 
 		<title>reveal.js - Slide Transitions</title>
 
-		<link rel="stylesheet" href="../../css/reveal.css">
-		<link rel="stylesheet" href="../../css/theme/white.css" id="theme">
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../dist/theme/white.css" id="theme">
 		<style type="text/css" media="screen">
 			.slides section.has-dark-background,
 			.slides section.has-dark-background h3 {
@@ -81,10 +81,8 @@
 
 		</div>
 
-		<script src="../../js/reveal.js"></script>
-
+		<script src="../dist/reveal.js"></script>
 		<script>
-
 			Reveal.initialize({
 				center: true,
 				history: true,
@@ -93,7 +91,6 @@
 				// transitionSpeed: 'slow',
 				// backgroundTransition: 'slide'
 			});
-
 		</script>
 
 	</body>

gruntfile.js

@@ -1,189 +0,0 @@
-const sass = require('node-sass');
-
-module.exports = grunt => {
-
-	require('load-grunt-tasks')(grunt);
-
-	let port = grunt.option('port') || 8000;
-	let root = grunt.option('root') || '.';
-
-	if (!Array.isArray(root)) root = [root];
-
-	// Project configuration
-	grunt.initConfig({
-		pkg: grunt.file.readJSON('package.json'),
-		meta: {
-			banner:
-				'/*!\n' +
-				' * reveal.js <%= pkg.version %> (<%= grunt.template.today("yyyy-mm-dd, HH:MM") %>)\n' +
-				' * http://revealjs.com\n' +
-				' * MIT licensed\n' +
-				' *\n' +
-				' * Copyright (C) 2020 Hakim El Hattab, http://hakim.se\n' +
-				' */'
-		},
-
-		qunit: {
-			files: [ 'test/*.html' ]
-		},
-
-		uglify: {
-			options: {
-				banner: '<%= meta.banner %>\n',
-				ie8: true
-			},
-			build: {
-				src: 'js/reveal.js',
-				dest: 'js/reveal.min.js'
-			}
-		},
-
-		sass: {
-			options: {
-				implementation: sass,
-				sourceMap: false
-			},
-			core: {
-				src: 'css/reveal.scss',
-				dest: 'css/reveal.css'
-			},
-			themes: {
-				expand: true,
-				cwd: 'css/theme/source',
-				src: ['*.sass', '*.scss'],
-				dest: 'css/theme',
-				ext: '.css'
-			}
-		},
-
-		autoprefixer: {
-			core: {
-				src: 'css/reveal.css'
-			}
-		},
-
-		cssmin: {
-			options: {
-				compatibility: 'ie9'
-			},
-			compress: {
-				src: 'css/reveal.css',
-				dest: 'css/reveal.min.css'
-			}
-		},
-
-		jshint: {
-			options: {
-				curly: false,
-				eqeqeq: true,
-				immed: true,
-				esnext: true,
-				latedef: 'nofunc',
-				newcap: true,
-				noarg: true,
-				sub: true,
-				undef: true,
-				eqnull: true,
-				browser: true,
-				expr: true,
-				loopfunc: true,
-				globals: {
-					head: false,
-					module: false,
-					console: false,
-					unescape: false,
-					define: false,
-					exports: false,
-					require: false
-				}
-			},
-			files: [ 'gruntfile.js', 'js/reveal.js' ]
-		},
-
-		connect: {
-			server: {
-				options: {
-					port: port,
-					base: root,
-					livereload: true,
-					open: true,
-					useAvailablePort: true
-				}
-			}
-		},
-
-		zip: {
-			bundle: {
-				src: [
-					'index.html',
-					'css/**',
-					'js/**',
-					'lib/**',
-					'images/**',
-					'plugin/**',
-					'**.md'
-				],
-				dest: 'reveal-js-presentation.zip'
-			}
-		},
-
-		watch: {
-			js: {
-				files: [ 'gruntfile.js', 'js/reveal.js' ],
-				tasks: 'js'
-			},
-			theme: {
-				files: [
-					'css/theme/source/*.sass',
-					'css/theme/source/*.scss',
-					'css/theme/template/*.sass',
-					'css/theme/template/*.scss'
-				],
-				tasks: 'css-themes'
-			},
-			css: {
-				files: [ 'css/reveal.scss' ],
-				tasks: 'css-core'
-			},
-			test: {
-				files: [ 'test/*.html' ],
-				tasks: 'test'
-			},
-			html: {
-				files: root.map(path => path + '/*.html')
-			},
-			markdown: {
-				files: root.map(path => path + '/*.md')
-			},
-			options: {
-				livereload: true
-			}
-		}
-
-	});
-
-	// Default task
-	grunt.registerTask( 'default', [ 'css', 'js' ] );
-
-	// JS task
-	grunt.registerTask( 'js', [ 'jshint', 'uglify', 'qunit' ] );
-
-	// Theme CSS
-	grunt.registerTask( 'css-themes', [ 'sass:themes' ] );
-
-	// Core framework CSS
-	grunt.registerTask( 'css-core', [ 'sass:core', 'autoprefixer', 'cssmin' ] );
-
-	// All CSS
-	grunt.registerTask( 'css', [ 'sass', 'autoprefixer', 'cssmin' ] );
-
-	// Package presentation to archive
-	grunt.registerTask( 'package', [ 'default', 'zip' ] );
-
-	// Serve presentation locally
-	grunt.registerTask( 'serve', [ 'connect', 'watch' ] );
-
-	// Run tests
-	grunt.registerTask( 'test', [ 'jshint', 'qunit' ] );
-
-};

gulpfile.js

@@ -0,0 +1,267 @@
+const pkg = require('./package.json')
+const path = require('path')
+const glob = require('glob')
+const yargs = require('yargs')
+const colors = require('colors')
+const qunit = require('node-qunit-puppeteer')
+
+const {rollup} = require('rollup')
+const {terser} = require('rollup-plugin-terser')
+const babel = require('rollup-plugin-babel')
+const commonjs = require('@rollup/plugin-commonjs')
+const resolve = require('@rollup/plugin-node-resolve')
+
+const gulp = require('gulp')
+const tap = require('gulp-tap')
+const zip = require('gulp-zip')
+const sass = require('gulp-sass')
+const header = require('gulp-header')
+const eslint = require('gulp-eslint')
+const minify = require('gulp-clean-css')
+const connect = require('gulp-connect')
+const autoprefixer = require('gulp-autoprefixer')
+
+const root = yargs.argv.root || '.'
+const port = yargs.argv.port || 8000
+
+const banner = `/*!
+* reveal.js ${pkg.version} (${new Date().toDateString()})
+* ${pkg.homepage}
+* MIT licensed
+*
+* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
+*/\n`
+
+// Prevents warnings from opening too many test pages
+process.setMaxListeners(20);
+
+const babelConfig = {
+    exclude: 'node_modules/**',
+    compact: false,
+    extensions: ['.js', '.html'],
+    plugins: ['transform-html-import-to-string'],
+    presets: [[
+        '@babel/preset-env',
+        {
+            corejs: 3,
+            useBuiltIns: 'entry',
+            modules: false
+        }
+    ]]
+};
+
+const rollupConfig = {
+    plugins: [
+        babel( babelConfig ),
+        resolve(),
+        commonjs(),
+        terser()
+    ]
+};
+
+// Our ES module bundle only needs to support modern
+// browser features
+const babelConfigESM = JSON.parse( JSON.stringify( babelConfig ) );
+babelConfigESM.presets[0][1].targets = { esmodules: true };
+
+const rollupConfigESM = {
+    plugins: [
+        babel( babelConfigESM ),
+        resolve(),
+        commonjs(),
+        terser()
+    ]
+};
+
+// Creates a bundle with broad browser support, exposed
+// as UMD
+gulp.task('js-es5', () => {
+    return rollup({
+        input: 'js/index.js',
+        ...rollupConfig
+    }).then( bundle => {
+        return bundle.write({
+            name: 'Reveal',
+            file: './dist/reveal.js',
+            format: 'umd',
+            banner: banner,
+            sourcemap: true
+        });
+    });
+})
+
+// Creates an ES module bundle
+gulp.task('js-es6', () => {
+    return rollup({
+        input: 'js/index.js',
+        ...rollupConfigESM
+    }).then( bundle => {
+        return bundle.write({
+            file: './dist/reveal.esm.js',
+            format: 'es',
+            banner: banner,
+            sourcemap: true
+        });
+    });
+})
+gulp.task('js', gulp.parallel('js-es5', 'js-es6'));
+
+// Creates a UMD and ES module bundle for each of our
+// built-in plugins
+gulp.task('plugins', () => {
+    return Promise.all([
+        { name: 'RevealHighlight', input: './plugin/highlight/plugin.js', output: './plugin/highlight/highlight' },
+        { name: 'RevealMarkdown', input: './plugin/markdown/plugin.js', output: './plugin/markdown/markdown' },
+        { name: 'RevealSearch', input: './plugin/search/plugin.js', output: './plugin/search/search' },
+        { name: 'RevealNotes', input: './plugin/notes/plugin.js', output: './plugin/notes/notes' },
+        { name: 'RevealZoom', input: './plugin/zoom/plugin.js', output: './plugin/zoom/zoom' },
+        { name: 'RevealMath', input: './plugin/math/plugin.js', output: './plugin/math/math' },
+    ].map( plugin => {
+        return rollup({
+                input: plugin.input,
+                ...rollupConfig
+            }).then( bundle => {
+                bundle.write({
+                    file: plugin.output + '.esm.js',
+                    name: plugin.name,
+                    format: 'es'
+                })
+
+                bundle.write({
+                    file: plugin.output + '.js',
+                    name: plugin.name,
+                    format: 'umd'
+                })
+            });
+    } ));
+})
+
+gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
+        .pipe(sass())
+        .pipe(gulp.dest('./dist/theme')))
+
+gulp.task('css-core', () => gulp.src(['css/reveal.scss'])
+    .pipe(sass())
+    .pipe(autoprefixer())
+    .pipe(minify({compatibility: 'ie9'}))
+    .pipe(header(banner))
+    .pipe(gulp.dest('./dist')))
+
+gulp.task('css', gulp.parallel('css-themes', 'css-core'))
+
+gulp.task('qunit', () => {
+
+    let serverConfig = {
+        root,
+        port: 8009,
+        host: '0.0.0.0',
+        name: 'test-server'
+    }
+
+    let server = connect.server( serverConfig )
+
+    let testFiles = glob.sync('test/*.html' )
+
+    let totalTests = 0;
+    let failingTests = 0;
+
+    let tests = Promise.all( testFiles.map( filename => {
+        return new Promise( ( resolve, reject ) => {
+            qunit.runQunitPuppeteer({
+                targetUrl: `http://${serverConfig.host}:${serverConfig.port}/${filename}`,
+                timeout: 20000,
+                redirectConsole: false,
+                puppeteerArgs: ['--allow-file-access-from-files']
+            })
+                .then(result => {
+                    if( result.stats.failed > 0 ) {
+                        console.log(`${'!'} ${filename} [${result.stats.passed}/${result.stats.total}] in ${result.stats.runtime}ms`.red);
+                        // qunit.printResultSummary(result, console);
+                        qunit.printFailedTests(result, console);
+                    }
+                    else {
+                        console.log(`${'✔'} ${filename} [${result.stats.passed}/${result.stats.total}] in ${result.stats.runtime}ms`.green);
+                    }
+
+                    totalTests += result.stats.total;
+                    failingTests += result.stats.failed;
+
+                    resolve();
+                })
+                .catch(error => {
+                    console.error(error);
+                    reject();
+                });
+        } )
+    } ) );
+
+    return new Promise( ( resolve, reject ) => {
+
+        tests.then( () => {
+                if( failingTests > 0 ) {
+                    reject( new Error(`${failingTests}/${totalTests} tests failed`.red) );
+                }
+                else {
+                    console.log(`${'✔'} Passed ${totalTests} tests`.green.bold);
+                    resolve();
+                }
+            } )
+            .catch( () => {
+                reject();
+            } )
+            .finally( () => {
+                server.close();
+            } );
+
+    } );
+} )
+
+gulp.task('eslint', () => gulp.src(['./js/**', 'gulpfile.js'])
+        .pipe(eslint())
+        .pipe(eslint.format()))
+
+gulp.task('test', gulp.series( 'eslint', 'qunit' ))
+
+gulp.task('default', gulp.series(gulp.parallel('js', 'css', 'plugins'), 'test'))
+
+gulp.task('build', gulp.parallel('js', 'css', 'plugins'))
+
+gulp.task('package', gulp.series('default', () =>
+
+    gulp.src([
+        './index.html',
+        './dist/**',
+        './lib/**',
+        './images/**',
+        './plugin/**',
+        './**.md'
+    ]).pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))
+
+))
+
+gulp.task('serve', () => {
+
+    connect.server({
+        root: root,
+        port: port,
+        host: '0.0.0.0',
+        livereload: true
+    })
+
+    gulp.watch(['js/**'], gulp.series('js', 'test'))
+
+    gulp.watch(['plugin/**/plugin.js'], gulp.series('plugins'))
+
+    gulp.watch(['test/*.html'], gulp.series('test'))
+
+    gulp.watch([
+        'css/theme/source/*.{sass,scss}',
+        'css/theme/template/*.{sass,scss}',
+    ], gulp.series('css-themes'))
+
+    gulp.watch([
+        'css/*.scss',
+        'css/print/*.{sass,scss,css}'
+    ], gulp.series('css-core'))
+
+})

index.html

@@ -6,21 +6,12 @@
 
 		<title>reveal.js</title>
 
-		<link rel="stylesheet" href="css/reset.css">
-		<link rel="stylesheet" href="css/reveal.css">
-		<link rel="stylesheet" href="css/theme/black.css">
+		<link rel="stylesheet" href="dist/reset.css">
+		<link rel="stylesheet" href="dist/reveal.css">
+		<link rel="stylesheet" href="dist/theme/black.css" id="theme">
 
-		<!-- Theme used for syntax highlighting of code -->
-		<link rel="stylesheet" href="lib/css/monokai.css">
-
-		<!-- Printing and PDF exports -->
-		<script>
-			var link = document.createElement( 'link' );
-			link.rel = 'stylesheet';
-			link.type = 'text/css';
-			link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
-			document.getElementsByTagName( 'head' )[0].appendChild( link );
-		</script>
+		<!-- Theme used for syntax highlighted code -->
+		<link rel="stylesheet" href="plugin/highlight/monokai.css" id="highlight-theme">
 	</head>
 	<body>
 		<div class="reveal">
@@ -30,20 +21,19 @@
 			</div>
 		</div>
 
-		<script src="js/reveal.js"></script>
-
+		<script src="dist/reveal.js"></script>
+		<script src="plugin/notes/notes.js"></script>
+		<script src="plugin/markdown/markdown.js"></script>
+		<script src="plugin/highlight/highlight.js"></script>
 		<script>
-			// More info about config & dependencies:
-			// - https://github.com/hakimel/reveal.js#configuration
-			// - https://github.com/hakimel/reveal.js#dependencies
+			// More info about initialization & config:
+			// - https://revealjs.netlify.app/initialization/
+			// - https://revealjs.netlify.app/config/
 			Reveal.initialize({
 				hash: true,
-				dependencies: [
-					{ src: 'plugin/markdown/marked.js' },
-					{ src: 'plugin/markdown/markdown.js' },
-					{ src: 'plugin/highlight/highlight.js' },
-					{ src: 'plugin/notes/notes.js', async: true }
-				]
+
+				// Learn about plugins: https://revealjs.netlify.app/plugins/
+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
 			});
 		</script>
 	</body>

js/components/playback.js

@@ -0,0 +1,165 @@
+/**
+ * UI component that lets the use control auto-slide
+ * playback via play/pause.
+ */
+export default class Playback {
+
+	/**
+	 * @param {HTMLElement} container The component will append
+	 * itself to this
+	 * @param {function} progressCheck A method which will be
+	 * called frequently to get the current playback progress on
+	 * a range of 0-1
+	 */
+	constructor( 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();
+
+	}
+
+	setPlaying( value ) {
+
+		const wasPlaying = this.playing;
+
+		this.playing = value;
+
+		// Start repainting if we weren't already
+		if( !wasPlaying && this.playing ) {
+			this.animate();
+		}
+		else {
+			this.render();
+		}
+
+	}
+
+	animate() {
+
+		const 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 ) {
+			requestAnimationFrame( this.animate.bind( this ) );
+		}
+
+	}
+
+	/**
+	 * Renders the current progress and playback state.
+	 */
+	render() {
+
+		let 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;
+
+		const endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
+		const 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();
+
+	}
+
+	on( type, listener ) {
+		this.canvas.addEventListener( type, listener, false );
+	}
+
+	off( type, listener ) {
+		this.canvas.removeEventListener( type, listener, false );
+	}
+
+	destroy() {
+
+		this.playing = false;
+
+		if( this.canvas.parentNode ) {
+			this.container.removeChild( this.canvas );
+		}
+
+	}
+
+}

js/config.js

@@ -0,0 +1,290 @@
+/**
+ * The default reveal.js config object.
+ */
+export default {
+
+	// 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,
+
+	// Flags if we should monitor the hash and change slides accordingly
+	respondToHashChanges: true,
+
+	// 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
+	//
+	// If you set this to 'foucsed', we will only capture keyboard events
+	// for embdedded decks when they are in focus
+	keyboardCondition: null,
+
+	// Disables the default reveal.js slide layout (scaling and centering)
+	// so that you can use custom CSS layout
+	disableLayout: false,
+
+	// Enable the slide overview mode
+	overview: true,
+
+	// 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: true,
+
+	// 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,
+
+	// Can be used to globally disable auto-animation
+	autoAnimate: true,
+
+	// Optionally provide a custom element matcher that will be
+	// used to dictate which elements we can animate between.
+	autoAnimateMatcher: null,
+
+	// Default settings for our auto-animate transitions, can be
+	// overridden per-slide or per-element via data arguments
+	autoAnimateEasing: 'ease',
+	autoAnimateDuration: 1.0,
+	autoAnimateUnmatched: true,
+
+	// CSS properties that can be auto-animated. Position & scale
+	// is matched separately so there's no need to include styles
+	// like top/right/bottom/left, width/height or margin.
+	autoAnimateStyles: [
+		'opacity',
+		'color',
+		'background-color',
+		'padding',
+		'font-size',
+		'line-height',
+		'letter-spacing',
+		'border-width',
+		'border-color',
+		'border-radius',
+		'outline',
+		'outline-offset'
+	],
+
+	// 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,
+
+	// 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: [],
+
+	// Plugin objects to register and use for this presentation
+	plugins: []
+
+}

js/controllers/autoanimate.js

@@ -0,0 +1,619 @@
+import { queryAll, extend, createStyleSheet } from '../utils/util.js'
+import { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'
+
+/**
+ * Automatically animates matching elements across
+ * slides with the [data-auto-animate] attribute.
+ */
+export default class AutoAnimate {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		// Counter used to generate unique IDs for auto-animated elements
+		this.autoAnimateCounter = 0;
+
+	}
+
+	/**
+	 * Runs an auto-animation between the given slides.
+	 *
+	 * @param  {HTMLElement} fromSlide
+	 * @param  {HTMLElement} toSlide
+	 */
+	run( fromSlide, toSlide ) {
+
+		// Clean up after prior animations
+		this.reset();
+
+		// Ensure that both slides are auto-animate targets
+		if( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' ) ) {
+
+			// Create a new auto-animate sheet
+			this.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();
+
+			let animationOptions = this.getAutoAnimateOptions( toSlide );
+
+			// Set our starting state
+			fromSlide.dataset.autoAnimate = 'pending';
+			toSlide.dataset.autoAnimate = 'pending';
+
+			// Flag the navigation direction, needed for fragment buildup
+			let allSlides = this.Reveal.getSlides();
+			animationOptions.slideDirection = allSlides.indexOf( toSlide ) > allSlides.indexOf( fromSlide ) ? 'forward' : 'backward';
+
+			// Inject our auto-animate styles for this transition
+			let css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {
+				return this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, this.autoAnimateCounter++ );
+			} );
+
+			// Animate unmatched elements, if enabled
+			if( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {
+
+				// Our default timings for unmatched elements
+				let defaultUnmatchedDuration = animationOptions.duration * 0.8,
+					defaultUnmatchedDelay = animationOptions.duration * 0.2;
+
+				this.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {
+
+					let unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );
+					let id = 'unmatched';
+
+					// If there is a duration or delay set specifically for this
+					// element our unmatched elements should adhere to those
+					if( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {
+						id = 'unmatched-' + this.autoAnimateCounter++;
+						css.push( `[data-auto-animate="running"] [data-auto-animate-target="${id}"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );
+					}
+
+					unmatchedElement.dataset.autoAnimateTarget = id;
+
+				}, this );
+
+				// Our default transition for unmatched elements
+				css.push( `[data-auto-animate="running"] [data-auto-animate-target="unmatched"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );
+
+			}
+
+			// Setting the whole chunk of CSS at once is the most
+			// efficient way to do this. Using sheet.insertRule
+			// is multiple factors slower.
+			this.autoAnimateStyleSheet.innerHTML = css.join( '' );
+
+			// Start the animation next cycle
+			requestAnimationFrame( () => {
+				if( this.autoAnimateStyleSheet ) {
+					// This forces our newly injected styles to be applied in Firefox
+					getComputedStyle( this.autoAnimateStyleSheet ).fontWeight;
+
+					toSlide.dataset.autoAnimate = 'running';
+				}
+			} );
+
+			this.Reveal.dispatchEvent({
+				type: 'autoanimate',
+				data: {
+					fromSlide,
+					toSlide,
+					sheet: this.autoAnimateStyleSheet
+				}
+			});
+
+		}
+
+	}
+
+	/**
+	 * Rolls back all changes that we've made to the DOM so
+	 * that as part of animating.
+	 */
+	reset() {
+
+		// Reset slides
+		queryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=""])' ).forEach( element => {
+			element.dataset.autoAnimate = '';
+		} );
+
+		// Reset elements
+		queryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {
+			delete element.dataset.autoAnimateTarget;
+		} );
+
+		// Remove the animation sheet
+		if( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {
+			this.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );
+			this.autoAnimateStyleSheet = null;
+		}
+
+	}
+
+	/**
+	 * Creates a FLIP animation where the `to` element starts out
+	 * in the `from` element position and animates to its original
+	 * state.
+	 *
+	 * @param {HTMLElement} from
+	 * @param {HTMLElement} to
+	 * @param {Object} elementOptions Options for this element pair
+	 * @param {Object} animationOptions Options set at the slide level
+	 * @param {String} id Unique ID that we can use to identify this
+	 * auto-animate element in the DOM
+	 */
+	autoAnimateElements( from, to, elementOptions, animationOptions, id ) {
+
+		// 'from' elements are given a data-auto-animate-target with no value,
+		// 'to' elements are are given a data-auto-animate-target with an ID
+		from.dataset.autoAnimateTarget = '';
+		to.dataset.autoAnimateTarget = id;
+
+		// Each element may override any of the auto-animate options
+		// like transition easing, duration and delay via data-attributes
+		let options = this.getAutoAnimateOptions( to, animationOptions );
+
+		// If we're using a custom element matcher the element options
+		// may contain additional transition overrides
+		if( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;
+		if( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;
+		if( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;
+
+		let fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),
+			toProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );
+
+		// Maintain fragment visibility for matching elements when
+		// we're navigating forwards, this way the viewer won't need
+		// to step through the same fragments twice
+		if( to.classList.contains( 'fragment' ) ) {
+
+			// Don't auto-animate the opacity of fragments to avoid
+			// conflicts with fragment animations
+			delete toProps.styles['opacity'];
+
+			if( from.classList.contains( 'fragment' ) ) {
+
+				let fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
+				let toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
+
+				// Only skip the fragment if the fragment animation style
+				// remains unchanged
+				if( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {
+					to.classList.add( 'visible', 'disabled' );
+				}
+
+			}
+
+		}
+
+		// If translation and/or scaling are enabled, css transform
+		// the 'to' element so that it matches the position and size
+		// of the 'from' element
+		if( elementOptions.translate !== false || elementOptions.scale !== false ) {
+
+			let presentationScale = this.Reveal.getScale();
+
+			let delta = {
+				x: ( fromProps.x - toProps.x ) / presentationScale,
+				y: ( fromProps.y - toProps.y ) / presentationScale,
+				scaleX: fromProps.width / toProps.width,
+				scaleY: fromProps.height / toProps.height
+			};
+
+			// Limit decimal points to avoid 0.0001px blur and stutter
+			delta.x = Math.round( delta.x * 1000 ) / 1000;
+			delta.y = Math.round( delta.y * 1000 ) / 1000;
+			delta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;
+			delta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;
+
+			let translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),
+				scale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );
+
+			// No need to transform if nothing's changed
+			if( translate || scale ) {
+
+				let transform = [];
+
+				if( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );
+				if( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );
+
+				fromProps.styles['transform'] = transform.join( ' ' );
+				fromProps.styles['transform-origin'] = 'top left';
+
+				toProps.styles['transform'] = 'none';
+
+			}
+
+		}
+
+		// Delete all unchanged 'to' styles
+		for( let propertyName in toProps.styles ) {
+			const toValue = toProps.styles[propertyName];
+			const fromValue = fromProps.styles[propertyName];
+
+			if( toValue === fromValue ) {
+				delete toProps.styles[propertyName];
+			}
+			else {
+				// If these property values were set via a custom matcher providing
+				// an explicit 'from' and/or 'to' value, we always inject those values.
+				if( toValue.explicitValue === true ) {
+					toProps.styles[propertyName] = toValue.value;
+				}
+
+				if( fromValue.explicitValue === true ) {
+					fromProps.styles[propertyName] = fromValue.value;
+				}
+			}
+		}
+
+		let css = '';
+
+		let toStyleProperties = Object.keys( toProps.styles );
+
+		// Only create animate this element IF at least one style
+		// property has changed
+		if( toStyleProperties.length > 0 ) {
+
+			// Instantly move to the 'from' state
+			fromProps.styles['transition'] = 'none';
+
+			// Animate towards the 'to' state
+			toProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;
+			toProps.styles['transition-property'] = toStyleProperties.join( ', ' );
+			toProps.styles['will-change'] = toStyleProperties.join( ', ' );
+
+			// Build up our custom CSS. We need to override inline styles
+			// so we need to make our styles vErY IMPORTANT!1!!
+			let fromCSS = Object.keys( fromProps.styles ).map( propertyName => {
+				return propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';
+			} ).join( '' );
+
+			let toCSS = Object.keys( toProps.styles ).map( propertyName => {
+				return propertyName + ': ' + toProps.styles[propertyName] + ' !important;';
+			} ).join( '' );
+
+			css = 	'[data-auto-animate-target="'+ id +'"] {'+ fromCSS +'}' +
+					'[data-auto-animate="running"] [data-auto-animate-target="'+ id +'"] {'+ toCSS +'}';
+
+		}
+
+		return css;
+
+	}
+
+	/**
+	 * Returns the auto-animate options for the given element.
+	 *
+	 * @param {HTMLElement} element Element to pick up options
+	 * from, either a slide or an animation target
+	 * @param {Object} [inheritedOptions] Optional set of existing
+	 * options
+	 */
+	getAutoAnimateOptions( element, inheritedOptions ) {
+
+		let options = {
+			easing: this.Reveal.getConfig().autoAnimateEasing,
+			duration: this.Reveal.getConfig().autoAnimateDuration,
+			delay: 0
+		};
+
+		options = extend( options, inheritedOptions );
+
+		// Inherit options from parent elements
+		if( element.closest && element.parentNode ) {
+			let autoAnimatedParent = element.parentNode.closest( '[data-auto-animate-target]' );
+			if( autoAnimatedParent ) {
+				options = this.getAutoAnimateOptions( autoAnimatedParent, options );
+			}
+		}
+
+		if( element.dataset.autoAnimateEasing ) {
+			options.easing = element.dataset.autoAnimateEasing;
+		}
+
+		if( element.dataset.autoAnimateDuration ) {
+			options.duration = parseFloat( element.dataset.autoAnimateDuration );
+		}
+
+		if( element.dataset.autoAnimateDelay ) {
+			options.delay = parseFloat( element.dataset.autoAnimateDelay );
+		}
+
+		return options;
+
+	}
+
+	/**
+	 * Returns an object containing all of the properties
+	 * that can be auto-animated for the given element and
+	 * their current computed values.
+	 *
+	 * @param {String} direction 'from' or 'to'
+	 */
+	getAutoAnimatableProperties( direction, element, elementOptions ) {
+
+		let config = this.Reveal.getConfig();
+
+		let properties = { styles: [] };
+
+		// Position and size
+		if( elementOptions.translate !== false || elementOptions.scale !== false ) {
+			let bounds;
+
+			// Custom auto-animate may optionally return a custom tailored
+			// measurement function
+			if( typeof elementOptions.measure === 'function' ) {
+				bounds = elementOptions.measure( element );
+			}
+			else {
+				if( config.center ) {
+					// More precise, but breaks when used in combination
+					// with zoom for scaling the deck ¯\_(ツ)_/¯
+					bounds = element.getBoundingClientRect();
+				}
+				else {
+					let scale = this.Reveal.getScale();
+					bounds = {
+						x: element.offsetLeft * scale,
+						y: element.offsetTop * scale,
+						width: element.offsetWidth * scale,
+						height: element.offsetHeight * scale
+					};
+				}
+			}
+
+			properties.x = bounds.x;
+			properties.y = bounds.y;
+			properties.width = bounds.width;
+			properties.height = bounds.height;
+		}
+
+		const computedStyles = getComputedStyle( element );
+
+		// CSS styles
+		( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {
+			let value;
+
+			// `style` is either the property name directly, or an object
+			// definition of a style property
+			if( typeof style === 'string' ) style = { property: style };
+
+			if( typeof style.from !== 'undefined' && direction === 'from' ) {
+				value = { value: style.from, explicitValue: true };
+			}
+			else if( typeof style.to !== 'undefined' && direction === 'to' ) {
+				value = { value: style.to, explicitValue: true };
+			}
+			else {
+				value = computedStyles[style.property];
+			}
+
+			if( value !== '' ) {
+				properties.styles[style.property] = value;
+			}
+		} );
+
+		return properties;
+
+	}
+
+	/**
+	 * Get a list of all element pairs that we can animate
+	 * between the given slides.
+	 *
+	 * @param {HTMLElement} fromSlide
+	 * @param {HTMLElement} toSlide
+	 *
+	 * @return {Array} Each value is an array where [0] is
+	 * the element we're animating from and [1] is the
+	 * element we're animating to
+	 */
+	getAutoAnimatableElements( fromSlide, toSlide ) {
+
+		let matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;
+
+		let pairs = matcher.call( this, fromSlide, toSlide );
+
+		let reserved = [];
+
+		// Remove duplicate pairs
+		return pairs.filter( ( pair, index ) => {
+			if( reserved.indexOf( pair.to ) === -1 ) {
+				reserved.push( pair.to );
+				return true;
+			}
+		} );
+
+	}
+
+	/**
+	 * Identifies matching elements between slides.
+	 *
+	 * You can specify a custom matcher function by using
+	 * the `autoAnimateMatcher` config option.
+	 */
+	getAutoAnimatePairs( fromSlide, toSlide ) {
+
+		let pairs = [];
+
+		const codeNodes = 'pre';
+		const textNodes = 'h1, h2, h3, h4, h5, h6, p, li';
+		const mediaNodes = 'img, video, iframe';
+
+		// Eplicit matches via data-id
+		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {
+			return node.nodeName + ':::' + node.getAttribute( 'data-id' );
+		} );
+
+		// Text
+		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {
+			return node.nodeName + ':::' + node.innerText;
+		} );
+
+		// Media
+		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {
+			return node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );
+		} );
+
+		// Code
+		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {
+			return node.nodeName + ':::' + node.innerText;
+		} );
+
+		pairs.forEach( pair => {
+
+			// Disable scale transformations on text nodes, we transiition
+			// each individual text property instead
+			if( pair.from.matches( textNodes ) ) {
+				pair.options = { scale: false };
+			}
+			// Animate individual lines of code
+			else if( pair.from.matches( codeNodes ) ) {
+
+				// Transition the code block's width and height instead of scaling
+				// to prevent its content from being squished
+				pair.options = { scale: false, styles: [ 'width', 'height' ] };
+
+				// Lines of code
+				this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {
+					return node.textContent;
+				}, {
+					scale: false,
+					styles: [],
+					measure: this.getLocalBoundingBox.bind( this )
+				} );
+
+				// Line numbers
+				this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {
+					return node.getAttribute( 'data-line-number' );
+				}, {
+					scale: false,
+					styles: [ 'width' ],
+					measure: this.getLocalBoundingBox.bind( this )
+				} );
+
+			}
+
+		}, this );
+
+		return pairs;
+
+	}
+
+	/**
+	 * Helper method which returns a bounding box based on
+	 * the given elements offset coordinates.
+	 *
+	 * @param {HTMLElement} element
+	 * @return {Object} x, y, width, height
+	 */
+	getLocalBoundingBox( element ) {
+
+		const presentationScale = this.Reveal.getScale();
+
+		return {
+			x: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,
+			y: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,
+			width: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,
+			height: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100
+		};
+
+	}
+
+	/**
+	 * Finds matching elements between two slides.
+	 *
+	 * @param {Array} pairs            	List of pairs to push matches to
+	 * @param {HTMLElement} fromScope   Scope within the from element exists
+	 * @param {HTMLElement} toScope     Scope within the to element exists
+	 * @param {String} selector         CSS selector of the element to match
+	 * @param {Function} serializer     A function that accepts an element and returns
+	 *                                  a stringified ID based on its contents
+	 * @param {Object} animationOptions Optional config options for this pair
+	 */
+	findAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {
+
+		let fromMatches = {};
+		let toMatches = {};
+
+		[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {
+			const key = serializer( element );
+			if( typeof key === 'string' && key.length ) {
+				fromMatches[key] = fromMatches[key] || [];
+				fromMatches[key].push( element );
+			}
+		} );
+
+		[].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {
+			const key = serializer( element );
+			toMatches[key] = toMatches[key] || [];
+			toMatches[key].push( element );
+
+			let fromElement;
+
+			// Retrieve the 'from' element
+			if( fromMatches[key] ) {
+				const pimaryIndex = toMatches[key].length - 1;
+				const secondaryIndex = fromMatches[key].length - 1;
+
+				// If there are multiple identical from elements, retrieve
+				// the one at the same index as our to-element.
+				if( fromMatches[key][ pimaryIndex ] ) {
+					fromElement = fromMatches[key][ pimaryIndex ];
+					fromMatches[key][ pimaryIndex ] = null;
+				}
+				// If there are no matching from-elements at the same index,
+				// use the last one.
+				else if( fromMatches[key][ secondaryIndex ] ) {
+					fromElement = fromMatches[key][ secondaryIndex ];
+					fromMatches[key][ secondaryIndex ] = null;
+				}
+			}
+
+			// If we've got a matching pair, push it to the list of pairs
+			if( fromElement ) {
+				pairs.push({
+					from: fromElement,
+					to: element,
+					options: animationOptions
+				});
+			}
+		} );
+
+	}
+
+	/**
+	 * Returns a all elements within the given scope that should
+	 * be considered unmatched in an auto-animate transition. If
+	 * fading of unmatched elements is turned on, these elements
+	 * will fade when going between auto-animate slides.
+	 *
+	 * Note that parents of auto-animate targets are NOT considerd
+	 * unmatched since fading them would break the auto-animation.
+	 *
+	 * @param {HTMLElement} rootElement
+	 * @return {Array}
+	 */
+	getUnmatchedAutoAnimateElements( rootElement ) {
+
+		return [].slice.call( rootElement.children ).reduce( ( result, element ) => {
+
+			const containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );
+
+			// The element is unmatched if
+			// - It is not an auto-animate target
+			// - It does not contain any auto-animate targets
+			if( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {
+				result.push( element );
+			}
+
+			if( element.querySelector( '[data-auto-animate-target]' ) ) {
+				result = result.concat( this.getUnmatchedAutoAnimateElements( element ) );
+			}
+
+			return result;
+
+		}, [] );
+
+	}
+
+}

js/controllers/backgrounds.js

@@ -0,0 +1,397 @@
+import { queryAll } from '../utils/util.js'
+import { colorToRgb, colorBrightness } from '../utils/color.js'
+
+/**
+ * Creates and updates slide backgrounds.
+ */
+export default class Backgrounds {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	render() {
+
+		this.element = document.createElement( 'div' );
+		this.element.className = 'backgrounds';
+		this.Reveal.getRevealElement().appendChild( this.element );
+
+	}
+
+	/**
+	 * 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.
+	 */
+	create() {
+
+		let printMode = this.Reveal.isPrintingPDF();
+
+		// Clear prior backgrounds
+		this.element.innerHTML = '';
+		this.element.classList.add( 'no-transition' );
+
+		// Iterate over all horizontal slides
+		this.Reveal.getHorizontalSlides().forEach( slideh => {
+
+			let backgroundStack = this.createBackground( slideh, this.element );
+
+			// Iterate over all vertical slides
+			queryAll( slideh, 'section' ).forEach( slidev => {
+
+				this.createBackground( slidev, backgroundStack );
+
+				backgroundStack.classList.add( 'stack' );
+
+			} );
+
+		} );
+
+		// Add parallax background if specified
+		if( this.Reveal.getConfig().parallaxBackgroundImage ) {
+
+			this.element.style.backgroundImage = 'url("' + this.Reveal.getConfig().parallaxBackgroundImage + '")';
+			this.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;
+			this.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;
+			this.element.style.backgroundPosition = this.Reveal.getConfig().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( () => {
+				this.Reveal.getRevealElement().classList.add( 'has-parallax-background' );
+			}, 1 );
+
+		}
+		else {
+
+			this.element.style.backgroundImage = '';
+			this.Reveal.getRevealElement().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
+	 */
+	createBackground( slide, container ) {
+
+		// Main slide background element
+		let element = document.createElement( 'div' );
+		element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
+
+		// Inner background element that wraps images/videos/iframes
+		let 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
+		this.sync( slide );
+
+		return element;
+
+	}
+
+	/**
+	 * Renders all of the visual properties of a slide background
+	 * based on the various background attributes.
+	 *
+	 * @param {HTMLElement} slide
+	 */
+	sync( slide ) {
+
+		let 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 = '';
+
+		let 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
+		let contrastColor = data.backgroundColor;
+
+		// If no bg color was found, check the computed background
+		if( !contrastColor ) {
+			let computedBackgroundStyle = window.getComputedStyle( element );
+			if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
+				contrastColor = computedBackgroundStyle.backgroundColor;
+			}
+		}
+
+		if( contrastColor ) {
+			let 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' );
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * 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.
+	 */
+	update( includeAll = false ) {
+
+		let currentSlide = this.Reveal.getCurrentSlide();
+		let indices = this.Reveal.getIndices();
+
+		let currentBackground = null;
+
+		// Reverse past/future classes when in RTL mode
+		let horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',
+			horizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';
+
+		// Update the classes of all backgrounds to match the
+		// states of their slides (past/present/future)
+		Array.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {
+
+			backgroundh.classList.remove( 'past', 'present', 'future' );
+
+			if( h < indices.h ) {
+				backgroundh.classList.add( horizontalPast );
+			}
+			else if ( h > indices.h ) {
+				backgroundh.classList.add( horizontalFuture );
+			}
+			else {
+				backgroundh.classList.add( 'present' );
+
+				// Store a reference to the current background element
+				currentBackground = backgroundh;
+			}
+
+			if( includeAll || h === indices.h ) {
+				queryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {
+
+					backgroundv.classList.remove( 'past', 'present', 'future' );
+
+					if( v < indices.v ) {
+						backgroundv.classList.add( 'past' );
+					}
+					else if ( v > indices.v ) {
+						backgroundv.classList.add( 'future' );
+					}
+					else {
+						backgroundv.classList.add( 'present' );
+
+						// Only if this is the present horizontal and vertical slide
+						if( h === indices.h ) currentBackground = backgroundv;
+					}
+
+				} );
+			}
+
+		} );
+
+		// Stop content inside of previous backgrounds
+		if( this.previousBackground ) {
+
+			this.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );
+
+		}
+
+		// Start content in the current background
+		if( currentBackground ) {
+
+			this.Reveal.slideContent.startEmbeddedContent( currentBackground );
+
+			let currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
+			if( currentBackgroundContent ) {
+
+				let 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.
+			let previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;
+			let currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
+			if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {
+				this.element.classList.add( 'no-transition' );
+			}
+
+			this.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( classToBubble => {
+				if( currentSlide.classList.contains( classToBubble ) ) {
+					this.Reveal.getRevealElement().classList.add( classToBubble );
+				}
+				else {
+					this.Reveal.getRevealElement().classList.remove( classToBubble );
+				}
+			}, this );
+		}
+
+		// Allow the first background to apply without transition
+		setTimeout( () => {
+			this.element.classList.remove( 'no-transition' );
+		}, 1 );
+
+	}
+
+	/**
+	 * Updates the position of the parallax background based
+	 * on the current slide index.
+	 */
+	updateParallax() {
+
+		let indices = this.Reveal.getIndices();
+
+		if( this.Reveal.getConfig().parallaxBackgroundImage ) {
+
+			let horizontalSlides = this.Reveal.getHorizontalSlides(),
+				verticalSlides = this.Reveal.getVerticalSlides();
+
+			let backgroundSize = this.element.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 );
+			}
+
+			let slideWidth = this.element.offsetWidth,
+				horizontalSlideCount = horizontalSlides.length,
+				horizontalOffsetMultiplier,
+				horizontalOffset;
+
+			if( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {
+				horizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;
+			}
+			else {
+				horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
+			}
+
+			horizontalOffset = horizontalOffsetMultiplier * indices.h * -1;
+
+			let slideHeight = this.element.offsetHeight,
+				verticalSlideCount = verticalSlides.length,
+				verticalOffsetMultiplier,
+				verticalOffset;
+
+			if( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {
+				verticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;
+			}
+			else {
+				verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
+			}
+
+			verticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indices.v : 0;
+
+			this.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
+
+		}
+
+	}
+
+}

js/controllers/controls.js

@@ -0,0 +1,259 @@
+import { queryAll } from '../utils/util.js'
+import { isAndroid } from '../utils/device.js'
+
+/**
+ * Manages our presentation controls. This includes both
+ * the built-in control arrows as well as event monitoring
+ * of any elements within the presentation with either of the
+ * following helper classes:
+ * - .navigate-up
+ * - .navigate-right
+ * - .navigate-down
+ * - .navigate-left
+ * - .navigate-next
+ * - .navigate-prev
+ */
+export default class Controls {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );
+		this.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );
+		this.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );
+		this.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );
+		this.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );
+		this.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );
+
+	}
+
+	render() {
+
+		const rtl = this.Reveal.getConfig().rtl;
+		const revealElement = this.Reveal.getRevealElement();
+
+		this.element = document.createElement( 'aside' );
+		this.element.className = 'controls';
+		this.element.innerHTML =
+			`<button class="navigate-left" aria-label="${ rtl ? 'next slide' : 'previous slide' }"><div class="controls-arrow"></div></button>
+			<button class="navigate-right" aria-label="${ rtl ? 'previous slide' : '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>`;
+
+		this.Reveal.getRevealElement().appendChild( this.element );
+
+		// There can be multiple instances of controls throughout the page
+		this.controlsLeft = queryAll( revealElement, '.navigate-left' );
+		this.controlsRight = queryAll( revealElement, '.navigate-right' );
+		this.controlsUp = queryAll( revealElement, '.navigate-up' );
+		this.controlsDown = queryAll( revealElement, '.navigate-down' );
+		this.controlsPrev = queryAll( revealElement, '.navigate-prev' );
+		this.controlsNext = queryAll( revealElement, '.navigate-next' );
+
+		// The left, right and down arrows in the standard reveal.js controls
+		this.controlsRightArrow = this.element.querySelector( '.navigate-right' );
+		this.controlsLeftArrow = this.element.querySelector( '.navigate-left' );
+		this.controlsDownArrow = this.element.querySelector( '.navigate-down' );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		this.element.style.display = config.controls ? 'block' : 'none';
+
+		this.element.setAttribute( 'data-controls-layout', config.controlsLayout );
+		this.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
+
+	}
+
+	bind() {
+
+		// Listen to both touch and click events, in case the device
+		// supports both
+		let pointerEvents = [ 'touchstart', 'click' ];
+
+		// Only support touch for Android, fixes double navigations in
+		// stock browser
+		if( isAndroid ) {
+			pointerEvents = [ 'touchstart' ];
+		}
+
+		pointerEvents.forEach( eventName => {
+			this.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );
+			this.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );
+			this.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );
+			this.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );
+			this.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );
+			this.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );
+		} );
+
+	}
+
+	unbind() {
+
+		[ 'touchstart', 'click' ].forEach( eventName => {
+			this.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );
+			this.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );
+			this.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );
+			this.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );
+			this.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );
+			this.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );
+		} );
+
+	}
+
+	/**
+	 * Updates the state of all control/navigation arrows.
+	 */
+	update() {
+
+		let routes = this.Reveal.availableRoutes();
+
+		// Remove the 'enabled' class from all directions
+		[...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {
+			node.classList.remove( 'enabled', '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 ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+		// Prev/next buttons
+		if( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+		if( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+		// Highlight fragment directions
+		let currentSlide = this.Reveal.getCurrentSlide();
+		if( currentSlide ) {
+
+			let fragmentsRoutes = this.Reveal.fragments.availableRoutes();
+
+			// Always apply fragment decorator to prev/next buttons
+			if( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			if( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+			// Apply fragment decorators to directional buttons based on
+			// what slide axis they are in
+			if( this.Reveal.isVerticalSlide( currentSlide ) ) {
+				if( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+				if( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			}
+			else {
+				if( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+				if( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+			}
+
+		}
+
+		if( this.Reveal.getConfig().controlsTutorial ) {
+
+			let indices = this.Reveal.getIndices();
+
+			// Highlight control arrows with an animation to ensure
+			// that the viewer knows how to navigate
+			if( !this.Reveal.hasNavigatedVertically() && routes.down ) {
+				this.controlsDownArrow.classList.add( 'highlight' );
+			}
+			else {
+				this.controlsDownArrow.classList.remove( 'highlight' );
+
+				if( this.Reveal.getConfig().rtl ) {
+
+					if( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {
+						this.controlsLeftArrow.classList.add( 'highlight' );
+					}
+					else {
+						this.controlsLeftArrow.classList.remove( 'highlight' );
+					}
+
+				} else {
+
+					if( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {
+						this.controlsRightArrow.classList.add( 'highlight' );
+					}
+					else {
+						this.controlsRightArrow.classList.remove( 'highlight' );
+					}
+				}
+			}
+		}
+	}
+
+	/**
+	 * Event handlers for navigation control buttons.
+	 */
+	onNavigateLeftClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		if( this.Reveal.getConfig().navigationMode === 'linear' ) {
+			this.Reveal.prev();
+		}
+		else {
+			this.Reveal.left();
+		}
+
+	}
+
+	onNavigateRightClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		if( this.Reveal.getConfig().navigationMode === 'linear' ) {
+			this.Reveal.next();
+		}
+		else {
+			this.Reveal.right();
+		}
+
+	}
+
+	onNavigateUpClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		this.Reveal.up();
+
+	}
+
+	onNavigateDownClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		this.Reveal.down();
+
+	}
+
+	onNavigatePrevClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		this.Reveal.prev();
+
+	}
+
+	onNavigateNextClicked( event ) {
+
+		event.preventDefault();
+		this.Reveal.onUserInput();
+
+		this.Reveal.next();
+
+	}
+
+
+}

js/controllers/focus.js

@@ -0,0 +1,95 @@
+/**
+ * Manages focus when a presentation is embedded. This
+ * helps us only capture keyboard from the presentation
+ * a user is currently interacting with in a page where
+ * multiple presentations are embedded.
+ */
+
+const STATE_FOCUS = 'focus';
+const STATE_BLUR = 'blur';
+
+export default class Focus {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.onRevealPointerDown = this.onRevealPointerDown.bind( this );
+		this.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		if( config.embedded ) {
+			this.blur();
+		}
+		else {
+			this.focus();
+			this.unbind();
+		}
+
+	}
+
+	bind() {
+
+		if( this.Reveal.getConfig().embedded ) {
+			this.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );
+		}
+
+	}
+
+	unbind() {
+
+		this.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );
+		document.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+
+	}
+
+	focus() {
+
+		if( this.state !== STATE_FOCUS ) {
+			this.Reveal.getRevealElement().classList.add( 'focused' );
+			document.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+		}
+
+		this.state = STATE_FOCUS;
+
+	}
+
+	blur() {
+
+		if( this.state !== STATE_BLUR ) {
+			this.Reveal.getRevealElement().classList.remove( 'focused' );
+			document.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+		}
+
+		this.state = STATE_BLUR;
+
+	}
+
+	isFocused() {
+
+		return this.state === STATE_FOCUS;
+
+	}
+
+	onRevealPointerDown( event ) {
+
+		this.focus();
+
+	}
+
+	onDocumentPointerDown( event ) {
+
+		let revealElement = event.target.closest( '.reveal' );
+		if( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {
+			this.blur();
+		}
+
+	}
+
+}

js/controllers/fragments.js

@@ -0,0 +1,375 @@
+import { extend, queryAll } from '../utils/util.js'
+
+/**
+ * Handles sorting and navigation of slide fragments.
+ * Fragments are elements within a slide that are
+ * revealed/animated incrementally.
+ */
+export default class Fragments {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		if( config.fragments === false ) {
+			this.disable();
+		}
+		else if( oldConfig.fragments === false ) {
+			this.enable();
+		}
+
+	}
+
+	/**
+	 * If fragments are disabled in the deck, they should all be
+	 * visible rather than stepped through.
+	 */
+	disable() {
+
+		queryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {
+			element.classList.add( 'visible' );
+			element.classList.remove( 'current-fragment' );
+		} );
+
+	}
+
+	/**
+	 * Reverse of #disable(). Only called if fragments have
+	 * previously been disabled.
+	 */
+	enable() {
+
+		queryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {
+			element.classList.remove( 'visible' );
+			element.classList.remove( 'current-fragment' );
+		} );
+
+	}
+
+	/**
+	 * Returns an object describing the available fragment
+	 * directions.
+	 *
+	 * @return {{prev: boolean, next: boolean}}
+	 */
+	availableRoutes() {
+
+		let currentSlide = this.Reveal.getCurrentSlide();
+		if( currentSlide && this.Reveal.getConfig().fragments ) {
+			let fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );
+			let hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );
+
+			return {
+				prev: fragments.length - hiddenFragments.length > 0,
+				next: !!hiddenFragments.length
+			};
+		}
+		else {
+			return { prev: false, next: false };
+		}
+
+	}
+
+	/**
+	 * 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
+	 */
+	sort( fragments, grouped = false ) {
+
+		fragments = Array.from( fragments );
+
+		let ordered = [],
+			unordered = [],
+			sorted = [];
+
+		// Group ordered and unordered elements
+		fragments.forEach( fragment => {
+			if( fragment.hasAttribute( 'data-fragment-index' ) ) {
+				let 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
+		let index = 0;
+
+		// Push all fragments in their sorted order to an array,
+		// this flattens the groups
+		ordered.forEach( group => {
+			group.forEach( fragment => {
+				sorted.push( fragment );
+				fragment.setAttribute( 'data-fragment-index', index );
+			} );
+
+			index ++;
+		} );
+
+		return grouped === true ? ordered : sorted;
+
+	}
+
+	/**
+	 * Sorts and formats all of fragments in the
+	 * presentation.
+	 */
+	sortAll() {
+
+		this.Reveal.getHorizontalSlides().forEach( horizontalSlide => {
+
+			let verticalSlides = queryAll( horizontalSlide, 'section' );
+			verticalSlides.forEach( ( verticalSlide, y ) => {
+
+				this.sort( verticalSlide.querySelectorAll( '.fragment' ) );
+
+			}, this );
+
+			if( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );
+
+		} );
+
+	}
+
+	/**
+	 * 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}}
+	 */
+	update( index, fragments ) {
+
+		let changedFragments = {
+			shown: [],
+			hidden: []
+		};
+
+		let currentSlide = this.Reveal.getCurrentSlide();
+		if( currentSlide && this.Reveal.getConfig().fragments ) {
+
+			fragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );
+
+			if( fragments.length ) {
+
+				let maxIndex = 0;
+
+				if( typeof index !== 'number' ) {
+					let currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
+					if( currentFragment ) {
+						index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+					}
+				}
+
+				Array.from( fragments ).forEach( ( 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 ) {
+						let wasVisible = el.classList.contains( 'visible' )
+						el.classList.add( 'visible' );
+						el.classList.remove( 'current-fragment' );
+
+						if( i === index ) {
+							// Announce the fragments one by one to the Screen Reader
+							this.Reveal.announceStatus( this.Reveal.getStatusText( el ) );
+
+							el.classList.add( 'current-fragment' );
+							this.Reveal.slideContent.startEmbeddedContent( el );
+						}
+
+						if( !wasVisible ) {
+							changedFragments.shown.push( el )
+							this.Reveal.dispatchEvent({
+								target: el,
+								type: 'visible',
+								bubbles: false
+							});
+						}
+					}
+					// Hidden fragments
+					else {
+						let wasVisible = el.classList.contains( 'visible' )
+						el.classList.remove( 'visible' );
+						el.classList.remove( 'current-fragment' );
+
+						if( wasVisible ) {
+							changedFragments.hidden.push( el );
+							this.Reveal.dispatchEvent({
+								target: el,
+								type: 'hidden',
+								bubbles: false
+							});
+						}
+					}
+
+				} );
+
+				// 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;
+
+	}
+
+	/**
+	 * 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
+	 */
+	sync( slide = this.Reveal.getCurrentSlide() ) {
+
+		return this.sort( slide.querySelectorAll( '.fragment' ) );
+
+	}
+
+	/**
+	 * 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
+	 */
+	goto( index, offset = 0 ) {
+
+		let currentSlide = this.Reveal.getCurrentSlide();
+		if( currentSlide && this.Reveal.getConfig().fragments ) {
+
+			let fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );
+			if( fragments.length ) {
+
+				// If no index is specified, find the current
+				if( typeof index !== 'number' ) {
+					let lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();
+
+					if( lastVisibleFragment ) {
+						index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+					}
+					else {
+						index = -1;
+					}
+				}
+
+				// Apply the offset if there is one
+				index += offset;
+
+				let changedFragments = this.update( index, fragments );
+
+				if( changedFragments.hidden.length ) {
+					this.Reveal.dispatchEvent({
+						type: 'fragmenthidden',
+						data: {
+							fragment: changedFragments.hidden[0],
+							fragments: changedFragments.hidden
+						}
+					});
+				}
+
+				if( changedFragments.shown.length ) {
+					this.Reveal.dispatchEvent({
+						type: 'fragmentshown',
+						data: {
+							fragment: changedFragments.shown[0],
+							fragments: changedFragments.shown
+						}
+					});
+				}
+
+				this.Reveal.controls.update();
+				this.Reveal.progress.update();
+
+				if( this.Reveal.getConfig().fragmentInURL ) {
+					this.Reveal.location.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
+	 */
+	next() {
+
+		return this.goto( null, 1 );
+
+	}
+
+	/**
+	 * Navigate to the previous slide fragment.
+	 *
+	 * @return {boolean} true if there was a previous fragment,
+	 * false otherwise
+	 */
+	prev() {
+
+		return this.goto( null, -1 );
+
+	}
+
+}

js/controllers/keyboard.js

@@ -0,0 +1,388 @@
+import { enterFullscreen } from '../utils/util.js'
+
+/**
+ * Handles all reveal.js keyboard interactions.
+ */
+export default class Keyboard {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		// A key:value map of keyboard keys and descriptions of
+		// the actions they trigger
+		this.shortcuts = {};
+
+		// Holds custom key code mappings
+		this.bindings = {};
+
+		this.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );
+		this.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		if( config.navigationMode === 'linear' ) {
+			this.shortcuts['→  ,  ↓  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';
+			this.shortcuts['←  ,  ↑  ,  P  ,  H  ,  K']           = 'Previous slide';
+		}
+		else {
+			this.shortcuts['N  ,  SPACE']   = 'Next slide';
+			this.shortcuts['P']             = 'Previous slide';
+			this.shortcuts['←  ,  H'] = 'Navigate left';
+			this.shortcuts['→  ,  L'] = 'Navigate right';
+			this.shortcuts['↑  ,  K'] = 'Navigate up';
+			this.shortcuts['↓  ,  J'] = 'Navigate down';
+		}
+
+		this.shortcuts['Home  ,  Shift ←']        = 'First slide';
+		this.shortcuts['End  ,  Shift →']         = 'Last slide';
+		this.shortcuts['B  ,  .']                       = 'Pause';
+		this.shortcuts['F']                             = 'Fullscreen';
+		this.shortcuts['ESC, O']                        = 'Slide overview';
+
+	}
+
+	/**
+	 * Starts listening for keyboard events.
+	 */
+	bind() {
+
+		document.addEventListener( 'keydown', this.onDocumentKeyDown, false );
+		document.addEventListener( 'keypress', this.onDocumentKeyPress, false );
+
+	}
+
+	/**
+	 * Stops listening for keyboard events.
+	 */
+	unbind() {
+
+		document.removeEventListener( 'keydown', this.onDocumentKeyDown, false );
+		document.removeEventListener( 'keypress', this.onDocumentKeyPress, false );
+
+	}
+
+	/**
+	 * Add a custom key binding with optional description to
+	 * be added to the help screen.
+	 */
+	addKeyBinding( binding, callback ) {
+
+		if( typeof binding === 'object' && binding.keyCode ) {
+			this.bindings[binding.keyCode] = {
+				callback: callback,
+				key: binding.key,
+				description: binding.description
+			};
+		}
+		else {
+			this.bindings[binding] = {
+				callback: callback,
+				key: null,
+				description: null
+			};
+		}
+
+	}
+
+	/**
+	 * Removes the specified custom key binding.
+	 */
+	removeKeyBinding( keyCode ) {
+
+		delete this.bindings[keyCode];
+
+	}
+
+	/**
+	 * Programmatically triggers a keyboard event
+	 *
+	 * @param {int} keyCode
+	 */
+	triggerKey( keyCode ) {
+
+		this.onDocumentKeyDown( { keyCode } );
+
+	}
+
+	/**
+	 * Registers a new shortcut to include in the help overlay
+	 *
+	 * @param {String} key
+	 * @param {String} value
+	 */
+	registerKeyboardShortcut( key, value ) {
+
+		this.shortcuts[key] = value;
+
+	}
+
+	getShortcuts() {
+
+		return this.shortcuts;
+
+	}
+
+	getBindings() {
+
+		return this.bindings;
+
+	}
+
+	/**
+	 * Handler for the document level 'keypress' event.
+	 *
+	 * @param {object} event
+	 */
+	onDocumentKeyPress( event ) {
+
+		// Check if the pressed key is question mark
+		if( event.shiftKey && event.charCode === 63 ) {
+			this.Reveal.toggleHelp();
+		}
+
+	}
+
+	/**
+	 * Handler for the document level 'keydown' event.
+	 *
+	 * @param {object} event
+	 */
+	onDocumentKeyDown( event ) {
+
+		let config = this.Reveal.getConfig();
+
+		// If there's a condition specified and it returns false,
+		// ignore this event
+		if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
+			return true;
+		}
+
+		// If keyboardCondition is set, only capture keyboard events
+		// for embedded decks when they are focused
+		if( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {
+			return true;
+		}
+
+		// Shorthand
+		let keyCode = event.keyCode;
+
+		// Remember if auto-sliding was paused so we can toggle it
+		let autoSlideWasPaused = !this.Reveal.isAutoSliding();
+
+		this.Reveal.onUserInput( event );
+
+		// Is there a focused element that could be using the keyboard?
+		let activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;
+		let activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
+		let activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
+
+		// Whitelist specific modified + keycode combinations
+		let prevSlideShortcut = event.shiftKey && event.keyCode === 32;
+		let firstSlideShortcut = event.shiftKey && keyCode === 37;
+		let lastSlideShortcut = event.shiftKey && keyCode === 39;
+
+		// Prevent all other events when a modifier is pressed
+		let 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', '.'
+		let resumeKeyCodes = [66,86,190,191];
+		let 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( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
+			return false;
+		}
+
+		// Use linear navigation if we're configured to OR if
+		// the presentation is one-dimensional
+		let useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();
+
+		let 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 ) {
+
+					let 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 this.Reveal[ value ] === 'function' ) {
+						this.Reveal[ value ].call();
+					}
+
+					triggered = true;
+
+				}
+
+			}
+
+		}
+
+		// 2. Registered custom key bindings
+		if( triggered === false ) {
+
+			for( key in this.bindings ) {
+
+				// Check if this binding matches the pressed key
+				if( parseInt( key, 10 ) === keyCode ) {
+
+					let action = this.bindings[ key ].callback;
+
+					// Callback function
+					if( typeof action === 'function' ) {
+						action.apply( null, [ event ] );
+					}
+					// String shortcuts to reveal.js API
+					else if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {
+						this.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 ) {
+				this.Reveal.prev();
+			}
+			// N, PAGE DOWN
+			else if( keyCode === 78 || keyCode === 34 ) {
+				this.Reveal.next();
+			}
+			// H, LEFT
+			else if( keyCode === 72 || keyCode === 37 ) {
+				if( firstSlideShortcut ) {
+					this.Reveal.slide( 0 );
+				}
+				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.prev();
+				}
+				else {
+					this.Reveal.left();
+				}
+			}
+			// L, RIGHT
+			else if( keyCode === 76 || keyCode === 39 ) {
+				if( lastSlideShortcut ) {
+					this.Reveal.slide( Number.MAX_VALUE );
+				}
+				else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.next();
+				}
+				else {
+					this.Reveal.right();
+				}
+			}
+			// K, UP
+			else if( keyCode === 75 || keyCode === 38 ) {
+				if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.prev();
+				}
+				else {
+					this.Reveal.up();
+				}
+			}
+			// J, DOWN
+			else if( keyCode === 74 || keyCode === 40 ) {
+				if( !this.Reveal.overview.isActive() && useLinearMode ) {
+					this.Reveal.next();
+				}
+				else {
+					this.Reveal.down();
+				}
+			}
+			// HOME
+			else if( keyCode === 36 ) {
+				this.Reveal.slide( 0 );
+			}
+			// END
+			else if( keyCode === 35 ) {
+				this.Reveal.slide( Number.MAX_VALUE );
+			}
+			// SPACE
+			else if( keyCode === 32 ) {
+				if( this.Reveal.overview.isActive() ) {
+					this.Reveal.overview.deactivate();
+				}
+				if( event.shiftKey ) {
+					this.Reveal.prev();
+				}
+				else {
+					this.Reveal.next();
+				}
+			}
+			// 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 ) {
+				this.Reveal.togglePause();
+			}
+			// F
+			else if( keyCode === 70 ) {
+				enterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );
+			}
+			// A
+			else if( keyCode === 65 ) {
+				if ( config.autoSlideStoppable ) {
+					this.Reveal.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 ) {
+			if( this.Reveal.closeOverlay() === false ) {
+				this.Reveal.overview.toggle();
+			}
+
+			event.preventDefault && event.preventDefault();
+		}
+
+		// If auto-sliding is enabled we need to cue up
+		// another timeout
+		this.Reveal.cueAutoSlide();
+
+	}
+
+}

js/controllers/location.js

@@ -0,0 +1,201 @@
+import { supportsHistoryAPI } from '../utils/device.js'
+
+/**
+ * Reads and writes the URL based on reveal.js' current state.
+ */
+export default class Location {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		// Delays updates to the URL due to a Chrome thumbnailer bug
+		this.writeURLTimeout = 0;
+
+		this.onWindowHashChange = this.onWindowHashChange.bind( this );
+
+	}
+
+	bind() {
+
+		window.addEventListener( 'hashchange', this.onWindowHashChange, false );
+
+	}
+
+	unbind() {
+
+		window.removeEventListener( 'hashchange', this.onWindowHashChange, false );
+
+	}
+
+	/**
+	 * Reads the current URL (hash) and navigates accordingly.
+	 */
+	readURL() {
+
+		let config = this.Reveal.getConfig();
+		let indices = this.Reveal.getIndices();
+		let currentSlide = this.Reveal.getCurrentSlide();
+
+		let hash = window.location.hash;
+
+		// Attempt to parse the hash as either an index or name
+		let 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]*$/.test( bits[0] ) && name.length ) {
+			let element;
+
+			let f;
+
+			// Parse named links with fragments (#/named-link/2)
+			if( /\/[-\d]+$/g.test( name ) ) {
+				f = parseInt( name.split( '/' ).pop(), 10 );
+				f = isNaN(f) ? undefined : f;
+				name = name.split( '/' ).shift();
+			}
+
+			// 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
+			let isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
+
+			if( element ) {
+				// If the slide exists and is not the current slide...
+				if ( !isSameNameAsCurrentSlide || typeof f !== 'undefined' ) {
+					// ...find the position of the named slide and navigate to it
+					let slideIndices = this.Reveal.getIndices( element );
+					this.Reveal.slide( slideIndices.h, slideIndices.v, f );
+				}
+			}
+			// If the slide doesn't exist, navigate to the current slide
+			else {
+				this.Reveal.slide( indices.h || 0, indices.v || 0 );
+			}
+		}
+		else {
+			let hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+
+			// Read the index components of the hash
+			let 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 !== indices.h || v !== indices.v || f !== undefined ) {
+				this.Reveal.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
+	 */
+	writeURL( delay ) {
+
+		let config = this.Reveal.getConfig();
+		let currentSlide = this.Reveal.getCurrentSlide();
+
+		// Make sure there's never more than one timeout running
+		clearTimeout( this.writeURLTimeout );
+
+		// If a delay is specified, timeout this call
+		if( typeof delay === 'number' ) {
+			this.writeURLTimeout = setTimeout( this.writeURL, delay );
+		}
+		else if( currentSlide ) {
+			// If we're configured to push to history OR the history
+			// API is not avaialble.
+			if( config.history || supportsHistoryAPI === false ) {
+				window.location.hash = this.getHash();
+			}
+			// 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, '#' + this.getHash() );
+			}
+			// UPDATE: The below nuking of all hash changes breaks
+			// anchors on pages where reveal.js is running. Removed
+			// in 4.0. Why was it here in the first place? ¯\_(ツ)_/¯
+			//
+			// 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 );
+			// }
+		}
+
+	}
+
+	/**
+	 * Return a hash URL that will resolve to the given slide location.
+	 *
+	 * @param {HTMLElement} [slide=currentSlide] The slide to link to
+	 */
+	getHash( slide ) {
+
+		let url = '/';
+
+		// Attempt to create a named link based on the slide's ID
+		let s = slide || this.Reveal.getCurrentSlide();
+		let id = s ? s.getAttribute( 'id' ) : null;
+		if( id ) {
+			id = encodeURIComponent( id );
+		}
+
+		let index = this.Reveal.getIndices( slide );
+		if( !this.Reveal.getConfig().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 ) {
+			url = '/' + id;
+
+			// If there is also a fragment, append that at the end
+			// of the named link, like: #/named-link/2
+			if( index.f >= 0 ) url += '/' + index.f;
+		}
+		// Otherwise use the /h/v index
+		else {
+			let hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;
+			if( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;
+			if( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );
+			if( index.f >= 0 ) url += '/' + index.f;
+		}
+
+		return url;
+
+	}
+
+	/**
+	 * Handler for the window level 'hashchange' event.
+	 *
+	 * @param {object} [event]
+	 */
+	onWindowHashChange( event ) {
+
+		this.readURL();
+
+	}
+
+}

js/controllers/notes.js

@@ -0,0 +1,114 @@
+/**
+ * Handles the showing and 
+ */
+export default class Notes {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	render() {
+
+		this.element = document.createElement( 'div' );
+		this.element.className = 'speaker-notes';
+		this.element.setAttribute( 'data-prevent-swipe', '' );
+		this.element.setAttribute( 'tabindex', '0' );
+		this.Reveal.getRevealElement().appendChild( this.element );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		if( config.showNotes ) {
+			this.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
+		}
+
+	}
+
+	/**
+	 * Pick up notes from the current slide and display them
+	 * to the viewer.
+	 *
+	 * @see {@link config.showNotes}
+	 */
+	update() {
+
+		if( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {
+
+			this.element.innerHTML = this.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.
+	 */
+	updateVisibility() {
+
+		if( this.Reveal.getConfig().showNotes && this.hasNotes() ) {
+			this.Reveal.getRevealElement().classList.add( 'show-notes' );
+		}
+		else {
+			this.Reveal.getRevealElement().classList.remove( 'show-notes' );
+		}
+
+	}
+
+	/**
+	 * Checks if there are speaker notes for ANY slide in the
+	 * presentation.
+	 */
+	hasNotes() {
+
+		return this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;
+
+	}
+
+	/**
+	 * Checks if this presentation is running inside of the
+	 * speaker notes window.
+	 *
+	 * @return {boolean}
+	 */
+	isSpeakerNotesWindow() {
+
+		return !!window.location.search.match( /receiver/gi );
+
+	}
+
+	/**
+	 * 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)}
+	 */
+	getSlideNotes( slide = this.Reveal.getCurrentSlide() ) {
+
+		// 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
+		let notesElement = slide.querySelector( 'aside.notes' );
+		if( notesElement ) {
+			return notesElement.innerHTML;
+		}
+
+		return null;
+
+	}
+
+}

js/controllers/overview.js

@@ -0,0 +1,255 @@
+import { SLIDES_SELECTOR } from '../utils/constants.js'
+import { extend, queryAll, transformElement } from '../utils/util.js'
+
+/**
+ * Handles all logic related to the overview mode
+ * (birds-eye view of all slides).
+ */
+export default class Overview {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.active = false;
+
+		this.onSlideClicked = this.onSlideClicked.bind( this );
+
+	}
+
+	/**
+	 * Displays the overview of slides (quick nav) by scaling
+	 * down and arranging all slide elements.
+	 */
+	activate() {
+
+		// Only proceed if enabled in config
+		if( this.Reveal.getConfig().overview && !this.isActive() ) {
+
+			this.active = true;
+
+			this.Reveal.getRevealElement().classList.add( 'overview' );
+
+			// Don't auto-slide while in overview mode
+			this.Reveal.cancelAutoSlide();
+
+			// Move the backgrounds element into the slide container to
+			// that the same scaling is applied
+			this.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );
+
+			// Clicking on an overview slide navigates to it
+			queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {
+				if( !slide.classList.contains( 'stack' ) ) {
+					slide.addEventListener( 'click', this.onSlideClicked, true );
+				}
+			} );
+
+			// Calculate slide sizes
+			const margin = 70;
+			const slideSize = this.Reveal.getComputedSlideSize();
+			this.overviewSlideWidth = slideSize.width + margin;
+			this.overviewSlideHeight = slideSize.height + margin;
+
+			// Reverse in RTL mode
+			if( this.Reveal.getConfig().rtl ) {
+				this.overviewSlideWidth = -this.overviewSlideWidth;
+			}
+
+			this.Reveal.updateSlidesVisibility();
+
+			this.layout();
+			this.update();
+
+			this.Reveal.layout();
+
+			const indices = this.Reveal.getIndices();
+
+			// Notify observers of the overview showing
+			this.Reveal.dispatchEvent({
+				type: 'overviewshown',
+				data: {
+					'indexh': indices.h,
+					'indexv': indices.v,
+					'currentSlide': this.Reveal.getCurrentSlide()
+				}
+			});
+
+		}
+
+	}
+
+	/**
+	 * Uses CSS transforms to position all slides in a grid for
+	 * display inside of the overview mode.
+	 */
+	layout() {
+
+		// Layout slides
+		this.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {
+			hslide.setAttribute( 'data-index-h', h );
+			transformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
+
+			if( hslide.classList.contains( 'stack' ) ) {
+
+				queryAll( hslide, 'section' ).forEach( ( vslide, v ) => {
+					vslide.setAttribute( 'data-index-h', h );
+					vslide.setAttribute( 'data-index-v', v );
+
+					transformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
+				} );
+
+			}
+		} );
+
+		// Layout slide backgrounds
+		Array.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {
+			transformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
+
+			queryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {
+				transformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
+			} );
+		} );
+
+	}
+
+	/**
+	 * Moves the overview viewport to the current slides.
+	 * Called each time the current slide changes.
+	 */
+	update() {
+
+		const vmin = Math.min( window.innerWidth, window.innerHeight );
+		const scale = Math.max( vmin / 5, 150 ) / vmin;
+		const indices = this.Reveal.getIndices();
+
+		this.Reveal.transformSlides( {
+			overview: [
+				'scale('+ scale +')',
+				'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',
+				'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'
+			].join( ' ' )
+		} );
+
+	}
+
+	/**
+	 * Exits the slide overview and enters the currently
+	 * active slide.
+	 */
+	deactivate() {
+
+		// Only proceed if enabled in config
+		if( this.Reveal.getConfig().overview ) {
+
+			this.active = false;
+
+			this.Reveal.getRevealElement().classList.remove( 'overview' );
+
+			// 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
+			this.Reveal.getRevealElement().classList.add( 'overview-deactivating' );
+
+			setTimeout( () => {
+				this.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );
+			}, 1 );
+
+			// Move the background element back out
+			this.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );
+
+			// Clean up changes made to slides
+			queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {
+				transformElement( slide, '' );
+
+				slide.removeEventListener( 'click', this.onSlideClicked, true );
+			} );
+
+			// Clean up changes made to backgrounds
+			queryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {
+				transformElement( background, '' );
+			} );
+
+			this.Reveal.transformSlides( { overview: '' } );
+
+			const indices = this.Reveal.getIndices();
+
+			this.Reveal.slide( indices.h, indices.v );
+			this.Reveal.layout();
+			this.Reveal.cueAutoSlide();
+
+			// Notify observers of the overview hiding
+			this.Reveal.dispatchEvent({
+				type: 'overviewhidden',
+				data: {
+					'indexh': indices.h,
+					'indexv': indices.v,
+					'currentSlide': this.Reveal.getCurrentSlide()
+				}
+			});
+
+		}
+	}
+
+	/**
+	 * 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.
+	 */
+	toggle( override ) {
+
+		if( typeof override === 'boolean' ) {
+			override ? this.activate() : this.deactivate();
+		}
+		else {
+			this.isActive() ? this.deactivate() : this.activate();
+		}
+
+	}
+
+	/**
+	 * Checks if the overview is currently active.
+	 *
+	 * @return {Boolean} true if the overview is active,
+	 * false otherwise
+	 */
+	isActive() {
+
+		return this.active;
+
+	}
+
+	/**
+	 * Invoked when a slide is and we're in the overview.
+	 *
+	 * @param {object} event
+	 */
+	onSlideClicked( event ) {
+
+		if( this.isActive() ) {
+			event.preventDefault();
+
+			let element = event.target;
+
+			while( element && !element.nodeName.match( /section/gi ) ) {
+				element = element.parentNode;
+			}
+
+			if( element && !element.classList.contains( 'disabled' ) ) {
+
+				this.deactivate();
+
+				if( element.nodeName.match( /section/gi ) ) {
+					let h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
+						v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
+
+					this.Reveal.slide( h, v );
+				}
+
+			}
+		}
+
+	}
+
+}

js/controllers/plugins.js

@@ -0,0 +1,241 @@
+import { loadScript } from '../utils/loader.js'
+
+/**
+ * Manages loading and registering of reveal.js plugins.
+ */
+export default class Plugins {
+
+	constructor( reveal ) {
+
+		this.Reveal = reveal;
+
+		// Flags our current state (idle -> loading -> loaded)
+		this.state = 'idle';
+
+		// An id:instance map of currently registed plugins
+		this.registeredPlugins = {};
+
+		this.asyncDependencies = [];
+
+	}
+
+	/**
+	 * Loads reveal.js dependencies, registers and
+	 * initializes plugins.
+	 *
+	 * Plugins are direct references to a reveal.js plugin
+	 * object that we register and initialize after any
+	 * synchronous dependencies have loaded.
+	 *
+	 * Dependencies are defined via the 'dependencies' config
+	 * option and will be loaded prior to starting reveal.js.
+	 * Some dependencies may have an 'async' flag, if so they
+	 * will load after reveal.js has been started up.
+	 */
+	load( plugins, dependencies ) {
+
+		this.state = 'loading';
+
+		plugins.forEach( this.registerPlugin.bind( this ) );
+
+		return new Promise( resolve => {
+
+			let scripts = [],
+				scriptsToLoad = 0;
+
+			dependencies.forEach( s => {
+				// Load if there's no condition or the condition is truthy
+				if( !s.condition || s.condition() ) {
+					if( s.async ) {
+						this.asyncDependencies.push( s );
+					}
+					else {
+						scripts.push( s );
+					}
+				}
+			} );
+
+			if( scripts.length ) {
+				scriptsToLoad = scripts.length;
+
+				const scriptLoadedCallback = (s) => {
+					if( s && typeof s.callback === 'function' ) s.callback();
+
+					if( --scriptsToLoad === 0 ) {
+						this.initPlugins().then( resolve );
+					}
+				};
+
+				// Load synchronous scripts
+				scripts.forEach( s => {
+					if( typeof s.id === 'string' ) {
+						this.registerPlugin( s );
+						scriptLoadedCallback( s );
+					}
+					else if( typeof s.src === 'string' ) {
+						loadScript( s.src, () => scriptLoadedCallback(s) );
+					}
+					else {
+						console.warn( 'Unrecognized plugin format', s );
+						scriptLoadedCallback();
+					}
+				} );
+			}
+			else {
+				this.initPlugins().then( resolve );
+			}
+
+		} );
+
+	}
+
+	/**
+	 * Initializes our plugins and waits for them to be ready
+	 * before proceeding.
+	 */
+	initPlugins() {
+
+		return new Promise( resolve => {
+
+			let pluginValues = Object.values( this.registeredPlugins );
+			let pluginsToInitialize = pluginValues.length;
+
+			// If there are no plugins, skip this step
+			if( pluginsToInitialize === 0 ) {
+				this.loadAsync().then( resolve );
+			}
+			// ... otherwise initialize plugins
+			else {
+
+				let initNextPlugin;
+
+				let afterPlugInitialized = () => {
+					if( --pluginsToInitialize === 0 ) {
+						this.loadAsync().then( resolve );
+					}
+					else {
+						initNextPlugin();
+					}
+				};
+
+				let i = 0;
+
+				// Initialize plugins serially
+				initNextPlugin = () => {
+
+					let plugin = pluginValues[i++];
+
+					// If the plugin has an 'init' method, invoke it
+					if( typeof plugin.init === 'function' ) {
+						let promise = plugin.init( this.Reveal );
+
+						// If the plugin returned a Promise, wait for it
+						if( promise && typeof promise.then === 'function' ) {
+							promise.then( afterPlugInitialized );
+						}
+						else {
+							afterPlugInitialized();
+						}
+					}
+					else {
+						afterPlugInitialized();
+					}
+
+				}
+
+				initNextPlugin();
+
+			}
+
+		} )
+
+	}
+
+	/**
+	 * Loads all async reveal.js dependencies.
+	 */
+	loadAsync() {
+
+		this.state = 'loaded';
+
+		if( this.asyncDependencies.length ) {
+			this.asyncDependencies.forEach( s => {
+				loadScript( s.src, s.callback );
+			} );
+		}
+
+		return Promise.resolve();
+
+	}
+
+	/**
+	 * 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()`.
+	 */
+	registerPlugin( plugin ) {
+
+		// Backwards compatibility to make reveal.js ~3.9.0
+		// plugins work with reveal.js 4.0.0
+		if( arguments.length === 2 && typeof arguments[0] === 'string' ) {
+			plugin = arguments[1];
+			plugin.id = arguments[0];
+		}
+		// Plugin can optionally be a function which we call
+		// to create an instance of the plugin
+		else if( typeof plugin === 'function' ) {
+			plugin = plugin();
+		}
+
+		let id = plugin.id;
+
+		if( typeof id !== 'string' ) {
+			console.warn( 'Unrecognized plugin format; can\'t find plugin.id', plugin );
+		}
+		else if( this.registeredPlugins[id] === undefined ) {
+			this.registeredPlugins[id] = plugin;
+
+			// If a plugin is registered after reveal.js is loaded,
+			// initialize it right away
+			if( this.state === 'loaded' && typeof plugin.init === 'function' ) {
+				plugin.init( this.Reveal );
+			}
+		}
+		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
+	 */
+	hasPlugin( id ) {
+
+		return !!this.registeredPlugins[id];
+
+	}
+
+	/**
+	 * Returns the specific plugin instance, if a plugin
+	 * with the given ID has been registered.
+	 *
+	 * @param {String} id Unique plugin identifier
+	 */
+	getPlugin( id ) {
+
+		return this.registeredPlugins[id];
+
+	}
+
+	getRegisteredPlugins() {
+
+		return this.registeredPlugins;
+
+	}
+
+}

js/controllers/pointer.js

@@ -0,0 +1,118 @@
+/**
+ * Handles hiding of the pointer/cursor when inactive.
+ */
+export default class Pointer {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		// Throttles mouse wheel navigation
+		this.lastMouseWheelStep = 0;
+
+		// Is the mouse pointer currently hidden from view
+		this.cursorHidden = false;
+
+		// Timeout used to determine when the cursor is inactive
+		this.cursorInactiveTimeout = 0;
+
+		this.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );
+		this.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		if( config.mouseWheel ) {
+			document.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
+			document.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+		}
+		else {
+			document.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
+			document.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+		}
+
+		// Auto-hide the mouse pointer when its inactive
+		if( config.hideInactiveCursor ) {
+			document.addEventListener( 'mousemove', this.onDocumentCursorActive, false );
+			document.addEventListener( 'mousedown', this.onDocumentCursorActive, false );
+		}
+		else {
+			this.showCursor();
+
+			document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
+			document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
+		}
+
+	}
+
+	/**
+	 * Shows the mouse pointer after it has been hidden with
+	 * #hideCursor.
+	 */
+	showCursor() {
+
+		if( this.cursorHidden ) {
+			this.cursorHidden = false;
+			this.Reveal.getRevealElement().style.cursor = '';
+		}
+
+	}
+
+	/**
+	 * Hides the mouse pointer when it's on top of the .reveal
+	 * container.
+	 */
+	hideCursor() {
+
+		if( this.cursorHidden === false ) {
+			this.cursorHidden = true;
+			this.Reveal.getRevealElement().style.cursor = 'none';
+		}
+
+	}
+
+	/**
+	 * Called whenever there is mouse input at the document level
+	 * to determine if the cursor is active or not.
+	 *
+	 * @param {object} event
+	 */
+	onDocumentCursorActive( event ) {
+
+		this.showCursor();
+
+		clearTimeout( this.cursorInactiveTimeout );
+
+		this.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );
+
+	}
+
+	/**
+	 * Handles mouse wheel scrolling, throttled to avoid skipping
+	 * multiple slides.
+	 *
+	 * @param {object} event
+	 */
+	onDocumentMouseScroll( event ) {
+
+		if( Date.now() - this.lastMouseWheelStep > 1000 ) {
+
+			this.lastMouseWheelStep = Date.now();
+
+			let delta = event.detail || -event.wheelDelta;
+			if( delta > 0 ) {
+				this.Reveal.next();
+			}
+			else if( delta < 0 ) {
+				this.Reveal.prev();
+			}
+
+		}
+
+	}
+
+}

js/controllers/print.js

@@ -0,0 +1,195 @@
+import { SLIDES_SELECTOR } from '../utils/constants.js'
+import { queryAll, createStyleSheet } from '../utils/util.js'
+
+/**
+ * Setups up our presentation for printing/exporting to PDF.
+ */
+export default class Print {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	/**
+	 * Configures the presentation for printing to a static
+	 * PDF.
+	 */
+	setupPDF() {
+
+		let config = this.Reveal.getConfig();
+
+		let slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+
+		// Dimensions of the PDF pages
+		let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+			pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
+
+		// Dimensions of slides within the pages
+		let slideWidth = slideSize.width,
+			slideHeight = slideSize.height;
+
+		// Let the browser know what page size we want to print
+		createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
+
+		// Limit the size of certain elements to the dimensions of the slide
+		createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
+
+		document.documentElement.classList.add( 'print-pdf' );
+		document.body.style.width = pageWidth + 'px';
+		document.body.style.height = pageHeight + 'px';
+
+		// Make sure stretch elements fit on slide
+		this.Reveal.layoutSlideContents( slideWidth, slideHeight );
+
+		// Compute slide numbers now, before we start duplicating slides
+		let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+		queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( function( slide ) {
+			slide.setAttribute( 'data-slide-number', this.Reveal.slideNumber.getSlideNumber( slide ) );
+		}, this );
+
+		// Slide and slide background layout
+		queryAll( this.Reveal.getRevealElement(), 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
+				let left = ( pageWidth - slideWidth ) / 2,
+					top = ( pageHeight - slideHeight ) / 2;
+
+				let contentHeight = slide.scrollHeight;
+				let 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
+				let 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?
+					let notes = getSlideNotes( slide );
+					if( notes ) {
+
+						let notesSpacing = 8;
+						let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+						let 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 ) {
+					let 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.
+					let fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
+
+					let previousFragmentStep;
+					let 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' );
+						}, this );
+
+						// Create a separate page for the current fragment state
+						let clonedPage = page.cloneNode( true );
+						page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
+
+						previousFragmentStep = fragments;
+						previousPage = clonedPage;
+
+					}, this );
+
+					// 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 {
+					queryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {
+						fragment.classList.add( 'visible' );
+					} );
+				}
+
+			}
+
+		}, this );
+
+		// Notify subscribers that the PDF layout is good to go
+		this.Reveal.dispatchEvent({ type: 'pdf-ready' });
+
+	}
+
+	/**
+	 * Checks if this instance is being used to print a PDF.
+	 */
+	isPrintingPDF() {
+
+		return ( /print-pdf/gi ).test( window.location.search );
+
+	}
+
+}

js/controllers/progress.js

@@ -0,0 +1,96 @@
+/**
+ * Creates a visual progress bar for the presentation.
+ */
+export default class Progress {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.onProgressClicked = this.onProgressClicked.bind( this );
+
+	}
+
+	render() {
+
+		this.element = document.createElement( 'div' );
+		this.element.className = 'progress';
+		this.Reveal.getRevealElement().appendChild( this.element );
+
+		this.bar = document.createElement( 'span' );
+		this.element.appendChild( this.bar );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		this.element.style.display = config.progress ? 'block' : 'none';
+
+	}
+
+	bind() {
+
+		if( this.Reveal.getConfig().progress && this.element ) {
+			this.element.addEventListener( 'click', this.onProgressClicked, false );
+		}
+
+	}
+
+	unbind() {
+
+		if ( this.Reveal.getConfig().progress && this.element ) {
+			this.element.removeEventListener( 'click', this.onProgressClicked, false );
+		}
+
+	}
+
+	/**
+	 * Updates the progress bar to reflect the current slide.
+	 */
+	update() {
+
+		// Update progress if enabled
+		if( this.Reveal.getConfig().progress && this.bar ) {
+
+			this.bar.style.width = this.Reveal.getProgress() * this.getMaxWidth() + 'px';
+
+		}
+
+	}
+
+	getMaxWidth() {
+
+		return this.Reveal.getRevealElement().offsetWidth;
+
+	}
+
+	/**
+	 * Clicking on the progress bar results in a navigation to the
+	 * closest approximate horizontal slide using this equation:
+	 *
+	 * ( clickX / presentationWidth ) * numberOfSlides
+	 *
+	 * @param {object} event
+	 */
+	onProgressClicked( event ) {
+
+		this.Reveal.onUserInput( event );
+
+		event.preventDefault();
+
+		let slidesTotal = this.Reveal.getHorizontalSlides().length;
+		let slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );
+
+		if( this.Reveal.getConfig().rtl ) {
+			slideIndex = slidesTotal - slideIndex;
+		}
+
+		this.Reveal.slide( slideIndex );
+
+	}
+
+
+}

js/controllers/slidecontent.js

@@ -0,0 +1,435 @@
+import { HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR } from '../utils/constants.js'
+import { extend, queryAll, closestParent } from '../utils/util.js'
+import { isMobile } from '../utils/device.js'
+
+/**
+ * Handles loading, unloading and playback of slide
+ * content such as images, videos and iframes.
+ */
+export default class SlideContent {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		this.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );
+
+	}
+
+	/**
+	 * Should the given element be preloaded?
+	 * Decides based on local element attributes and global config.
+	 *
+	 * @param {HTMLElement} element
+	 */
+	shouldPreload( element ) {
+
+		// Prefer an explicit global preload setting
+		let preload = this.Reveal.getConfig().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
+	 */
+	load( slide, options = {} ) {
+
+		// Show the slide element
+		slide.style.display = this.Reveal.getConfig().display;
+
+		// Media elements with data-src attributes
+		queryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {
+			if( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {
+				element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+				element.setAttribute( 'data-lazy-loaded', '' );
+				element.removeAttribute( 'data-src' );
+			}
+		} );
+
+		// Media elements with <source> children
+		queryAll( slide, 'video, audio' ).forEach( media => {
+			let sources = 0;
+
+			queryAll( media, 'source[data-src]' ).forEach( 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
+		let background = slide.slideBackgroundElement;
+		if( background ) {
+			background.style.display = 'block';
+
+			let backgroundContent = slide.slideBackgroundContentElement;
+			let backgroundIframe = slide.getAttribute( 'data-background-iframe' );
+
+			// If the background contains media, load it
+			if( background.hasAttribute( 'data-loaded' ) === false ) {
+				background.setAttribute( 'data-loaded', 'true' );
+
+				let 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 && !this.Reveal.isSpeakerNotes() ) {
+					let 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( isMobile ) {
+						video.muted = true;
+						video.autoplay = true;
+						video.setAttribute( 'playsinline', '' );
+					}
+
+					// Support comma separated lists of video sources
+					backgroundVideo.split( ',' ).forEach( source => {
+						video.innerHTML += '<source src="'+ source +'">';
+					} );
+
+					backgroundContent.appendChild( video );
+				}
+				// Iframes
+				else if( backgroundIframe && options.excludeIframes !== true ) {
+					let 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
+			let backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
+			if( backgroundIframeElement ) {
+
+				// Check if this iframe is eligible to be preloaded
+				if( this.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
+	 */
+	unload( slide ) {
+
+		// Hide the slide element
+		slide.style.display = 'none';
+
+		// Hide the corresponding background element
+		let background = this.Reveal.getSlideBackground( slide );
+		if( background ) {
+			background.style.display = 'none';
+
+			// Unload any background iframes
+			queryAll( background, 'iframe[src]' ).forEach( element => {
+				element.removeAttribute( 'src' );
+			} );
+		}
+
+		// Reset lazy-loaded media elements with src attributes
+		queryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {
+			element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
+			element.removeAttribute( 'src' );
+		} );
+
+		// Reset lazy-loaded media elements with <source> children
+		queryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {
+			source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
+			source.removeAttribute( 'src' );
+		} );
+
+	}
+
+	/**
+	 * Enforces origin-specific format rules for embedded media.
+	 */
+	formatEmbeddedContent() {
+
+		let _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {
+			queryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ).forEach( el => {
+				let 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
+	 */
+	startEmbeddedContent( element ) {
+
+		if( element && !this.Reveal.isSpeakerNotes() ) {
+
+			// Restart GIFs
+			queryAll( element, 'img[src$=".gif"]' ).forEach( 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
+			queryAll( element, 'video, audio' ).forEach( el => {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				// Prefer an explicit global autoplay setting
+				let autoplay = this.Reveal.getConfig().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 ) {
+						this.startEmbeddedMedia( { target: el } );
+					}
+					// Mobile devices never fire a loaded event so instead
+					// of waiting, we initiate playback
+					else if( isMobile ) {
+						let 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( () => {
+								el.controls = true;
+
+								// Once the video does start playing, hide the controls again
+								el.addEventListener( 'play', () => {
+									el.controls = false;
+								} );
+							} );
+						}
+					}
+					// If the media isn't loaded, wait before playing
+					else {
+						el.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes
+						el.addEventListener( 'loadeddata', this.startEmbeddedMedia );
+					}
+
+				}
+			} );
+
+			// Normal iframes
+			queryAll( element, 'iframe[src]' ).forEach( el => {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				this.startEmbeddedIframe( { target: el } );
+			} );
+
+			// Lazy loading iframes
+			queryAll( element, 'iframe[data-src]' ).forEach( el => {
+				if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
+					return;
+				}
+
+				if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
+					el.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes
+					el.addEventListener( 'load', this.startEmbeddedIframe );
+					el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
+				}
+			} );
+
+		}
+
+	}
+
+	/**
+	 * Starts playing an embedded video/audio element after
+	 * it has finished loading.
+	 *
+	 * @param {object} event
+	 */
+	startEmbeddedMedia( event ) {
+
+		let isAttachedToDOM = !!closestParent( event.target, 'html' ),
+			isVisible  		= !!closestParent( event.target, '.present' );
+
+		if( isAttachedToDOM && isVisible ) {
+			event.target.currentTime = 0;
+			event.target.play();
+		}
+
+		event.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );
+
+	}
+
+	/**
+	 * "Starts" the content of an embedded iframe using the
+	 * postMessage API.
+	 *
+	 * @param {object} event
+	 */
+	startEmbeddedIframe( event ) {
+
+		let iframe = event.target;
+
+		if( iframe && iframe.contentWindow ) {
+
+			let isAttachedToDOM = !!closestParent( event.target, 'html' ),
+				isVisible  		= !!closestParent( event.target, '.present' );
+
+			if( isAttachedToDOM && isVisible ) {
+
+				// Prefer an explicit global autoplay setting
+				let autoplay = this.Reveal.getConfig().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
+	 */
+	stopEmbeddedContent( element, options = {} ) {
+
+		options = extend( {
+			// Defaults
+			unloadIframes: true
+		}, options );
+
+		if( element && element.parentNode ) {
+			// HTML5 media elements
+			queryAll( element, 'video, audio' ).forEach( 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
+			queryAll( element, 'iframe' ).forEach( el => {
+				if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
+				el.removeEventListener( 'load', this.startEmbeddedIframe );
+			});
+
+			// YouTube postMessage API
+			queryAll( element, 'iframe[src*="youtube.com/embed/"]' ).forEach( el => {
+				if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
+					el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
+				}
+			});
+
+			// Vimeo postMessage API
+			queryAll( element, 'iframe[src*="player.vimeo.com/"]' ).forEach( 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
+				queryAll( element, 'iframe[data-src]' ).forEach( 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' );
+				} );
+			}
+		}
+
+	}
+
+}

js/controllers/slidenumber.js

@@ -0,0 +1,123 @@
+/**
+ * Handles the display of reveal.js' optional slide number.
+ */
+export default class SlideNumber {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	render() {
+
+		this.element = document.createElement( 'div' );
+		this.element.className = 'slide-number';
+		this.Reveal.getRevealElement().appendChild( this.element );
+
+	}
+
+	/**
+	 * Called when the reveal.js config is updated.
+	 */
+	configure( config, oldConfig ) {
+
+		let slideNumberDisplay = 'none';
+		if( config.slideNumber && !this.Reveal.isPrintingPDF() ) {
+			if( config.showSlideNumber === 'all' ) {
+				slideNumberDisplay = 'block';
+			}
+			else if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {
+				slideNumberDisplay = 'block';
+			}
+		}
+
+		this.element.style.display = slideNumberDisplay;
+
+	}
+
+	/**
+	 * Updates the slide number to match the current slide.
+	 */
+	update() {
+
+		// Update slide number if enabled
+		if( this.Reveal.getConfig().slideNumber && this.element ) {
+			this.element.innerHTML = this.getSlideNumber();
+		}
+
+	}
+
+	/**
+	 * Returns the HTML string corresponding to the current slide
+	 * number, including formatting.
+	 */
+	getSlideNumber( slide = this.Reveal.getCurrentSlide() ) {
+
+		let config = this.Reveal.getConfig();
+		let value;
+		let format = 'h.v';
+
+		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 ) && this.Reveal.getHorizontalSlides().length === 1 ) {
+				format = 'c';
+			}
+
+			value = [];
+			switch( format ) {
+				case 'c':
+					value.push( this.Reveal.getSlidePastCount( slide ) + 1 );
+					break;
+				case 'c/t':
+					value.push( this.Reveal.getSlidePastCount( slide ) + 1, '/', this.Reveal.getTotalSlides() );
+					break;
+				default:
+					let indices = this.Reveal.getIndices( slide );
+					value.push( indices.h + 1 );
+					let sep = format === 'h/v' ? '/' : '.';
+					if( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
+			}
+		}
+
+		let url = '#' + this.Reveal.location.getHash( slide );
+		return this.formatNumber( 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
+	 */
+	formatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {
+
+		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>`;
+		}
+
+	}
+
+}

js/controllers/touch.js

@@ -0,0 +1,259 @@
+import { isAndroid } from '../utils/device.js'
+
+const SWIPE_THRESHOLD = 40;
+
+/**
+ * Controls all touch interactions and navigations for
+ * a presentation.
+ */
+export default class Touch {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+		// Holds information about the currently ongoing touch interaction
+		this.touchStartX = 0;
+		this.touchStartY = 0;
+		this.touchStartCount = 0;
+		this.touchCaptured = false;
+
+		this.onPointerDown = this.onPointerDown.bind( this );
+		this.onPointerMove = this.onPointerMove.bind( this );
+		this.onPointerUp = this.onPointerUp.bind( this );
+		this.onTouchStart = this.onTouchStart.bind( this );
+		this.onTouchMove = this.onTouchMove.bind( this );
+		this.onTouchEnd = this.onTouchEnd.bind( this );
+
+	}
+
+	/**
+	 *
+	 */
+	bind() {
+
+		let revealElement = this.Reveal.getRevealElement();
+
+		if( 'onpointerdown' in window ) {
+			// Use W3C pointer events
+			revealElement.addEventListener( 'pointerdown', this.onPointerDown, false );
+			revealElement.addEventListener( 'pointermove', this.onPointerMove, false );
+			revealElement.addEventListener( 'pointerup', this.onPointerUp, false );
+		}
+		else if( window.navigator.msPointerEnabled ) {
+			// IE 10 uses prefixed version of pointer events
+			revealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );
+			revealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );
+			revealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );
+		}
+		else {
+			// Fall back to touch events
+			revealElement.addEventListener( 'touchstart', this.onTouchStart, false );
+			revealElement.addEventListener( 'touchmove', this.onTouchMove, false );
+			revealElement.addEventListener( 'touchend', this.onTouchEnd, false );
+		}
+
+	}
+
+	/**
+	 *
+	 */
+	unbind() {
+
+		let revealElement = this.Reveal.getRevealElement();
+
+		revealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );
+		revealElement.removeEventListener( 'pointermove', this.onPointerMove, false );
+		revealElement.removeEventListener( 'pointerup', this.onPointerUp, false );
+
+		revealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );
+		revealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );
+		revealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );
+
+		revealElement.removeEventListener( 'touchstart', this.onTouchStart, false );
+		revealElement.removeEventListener( 'touchmove', this.onTouchMove, false );
+		revealElement.removeEventListener( 'touchend', this.onTouchEnd, false );
+
+	}
+
+	/**
+	 * Checks if the target element prevents the triggering of
+	 * swipe navigation.
+	 */
+	isSwipePrevented( target ) {
+
+		while( target && typeof target.hasAttribute === 'function' ) {
+			if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
+			target = target.parentNode;
+		}
+
+		return false;
+
+	}
+
+	/**
+	 * Handler for the 'touchstart' event, enables support for
+	 * swipe and pinch gestures.
+	 *
+	 * @param {object} event
+	 */
+	onTouchStart( event ) {
+
+		if( this.isSwipePrevented( event.target ) ) return true;
+
+		this.touchStartX = event.touches[0].clientX;
+		this.touchStartY = event.touches[0].clientY;
+		this.touchStartCount = event.touches.length;
+
+	}
+
+	/**
+	 * Handler for the 'touchmove' event.
+	 *
+	 * @param {object} event
+	 */
+	onTouchMove( event ) {
+
+		if( this.isSwipePrevented( event.target ) ) return true;
+
+		let config = this.Reveal.getConfig();
+
+		// Each touch should only trigger one action
+		if( !this.touchCaptured ) {
+			this.Reveal.onUserInput( event );
+
+			let currentX = event.touches[0].clientX;
+			let currentY = event.touches[0].clientY;
+
+			// There was only one touch point, look for a swipe
+			if( event.touches.length === 1 && this.touchStartCount !== 2 ) {
+
+				let availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });
+
+				let deltaX = currentX - this.touchStartX,
+					deltaY = currentY - this.touchStartY;
+
+				if( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+					this.touchCaptured = true;
+					if( config.navigationMode === 'linear' ) {
+						if( config.rtl ) {
+							this.Reveal.next();
+						}
+						else {
+							this.Reveal.prev();
+						}
+					}
+					else {
+						this.Reveal.left();
+					}
+				}
+				else if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+					this.touchCaptured = true;
+					if( config.navigationMode === 'linear' ) {
+						if( config.rtl ) {
+							this.Reveal.prev();
+						}
+						else {
+							this.Reveal.next();
+						}
+					}
+					else {
+						this.Reveal.right();
+					}
+				}
+				else if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {
+					this.touchCaptured = true;
+					if( config.navigationMode === 'linear' ) {
+						this.Reveal.prev();
+					}
+					else {
+						this.Reveal.up();
+					}
+				}
+				else if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {
+					this.touchCaptured = true;
+					if( config.navigationMode === 'linear' ) {
+						this.Reveal.next();
+					}
+					else {
+						this.Reveal.down();
+					}
+				}
+
+				// If we're embedded, only block touch events if they have
+				// triggered an action
+				if( config.embedded ) {
+					if( this.touchCaptured || this.Reveal.isVerticalSlide() ) {
+						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( isAndroid ) {
+			event.preventDefault();
+		}
+
+	}
+
+	/**
+	 * Handler for the 'touchend' event.
+	 *
+	 * @param {object} event
+	 */
+	onTouchEnd( event ) {
+
+		this.touchCaptured = false;
+
+	}
+
+	/**
+	 * Convert pointer down to touch start.
+	 *
+	 * @param {object} event
+	 */
+	onPointerDown( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			this.onTouchStart( event );
+		}
+
+	}
+
+	/**
+	 * Convert pointer move to touch move.
+	 *
+	 * @param {object} event
+	 */
+	onPointerMove( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			this.onTouchMove( event );
+		}
+
+	}
+
+	/**
+	 * Convert pointer up to touch end.
+	 *
+	 * @param {object} event
+	 */
+	onPointerUp( event ) {
+
+		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
+			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+			this.onTouchEnd( event );
+		}
+
+	}
+
+}

js/index.js

@@ -0,0 +1,54 @@
+import Deck from './reveal.js'
+
+/**
+ * Expose the Reveal class to the window. To create a
+ * new instance:
+ * let deck = new Reveal( document.querySelector( '.reveal' ), {
+ *   controls: false
+ * } );
+ * deck.initialize().then(() => {
+ *   // reveal.js is ready
+ * });
+ */
+let Reveal = Deck;
+
+
+/**
+ * The below is a thin shell that mimics the pre 4.0
+ * reveal.js API and ensures backwards compatibility.
+ * This API only allows for one Reveal instance per
+ * page, whereas the new API above lets you run many
+ * presentations on the same page.
+ *
+ * Reveal.initialize( { controls: false } ).then(() => {
+ *   // reveal.js is ready
+ * });
+ */
+
+let enqueuedAPICalls = [];
+
+Reveal.initialize = options => {
+
+	// Create our singleton reveal.js instance
+	Object.assign( Reveal, new Deck( document.querySelector( '.reveal' ), options ) );
+
+	// Invoke any enqueued API calls
+	enqueuedAPICalls.map( method => method( Reveal ) );
+
+	return Reveal.initialize();
+
+}
+
+/**
+ * The pre 4.0 API let you add event listener before
+ * initializing. We maintain the same behavior by
+ * queuing up premature API calls and invoking all
+ * of them when Reveal.initialize is called.
+ */
+[ 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {
+	Reveal[method] = ( ...args ) => {
+		enqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );
+	}
+} );
+
+export default Reveal;

js/utils/color.js

@@ -0,0 +1,77 @@
+/**
+ * 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}
+ */
+export const colorToRgb = ( color ) => {
+
+	let hex3 = color.match( /^#([0-9a-f]{3})$/i );
+	if( hex3 && hex3[1] ) {
+		hex3 = hex3[1];
+		return {
+			r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
+			g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
+			b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
+		};
+	}
+
+	let hex6 = color.match( /^#([0-9a-f]{6})$/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 )
+		};
+	}
+
+	let 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 )
+		};
+	}
+
+	let 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}
+ */
+export const colorBrightness = ( color ) => {
+
+	if( typeof color === 'string' ) color = colorToRgb( color );
+
+	if( color ) {
+		return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
+	}
+
+	return null;
+
+}

js/utils/constants.js

@@ -0,0 +1,10 @@
+
+export const SLIDES_SELECTOR = '.slides section';
+export const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';
+export const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';
+
+// Methods that may not be invoked via the postMessage API
+export const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener/;
+
+// Regex for retrieving the fragment style from a class attribute
+export const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;

js/utils/device.js

@@ -0,0 +1,17 @@
+const UA = navigator.userAgent;
+const testElement = document.createElement( 'div' );
+
+export const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
+						( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
+
+export const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
+
+export const isAndroid = /android/gi.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 whitelisted browsers.
+export const supportsZoom = 'zoom' in testElement.style && !isMobile &&
+				( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
+
+export const supportsHistoryAPI = typeof window.history.replaceState === 'function' && !/PhantomJS/.test( UA );

js/utils/loader.js

@@ -0,0 +1,46 @@
+/**
+ * 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
+ */
+export const loadScript = ( url, callback ) => {
+
+	const script = document.createElement( 'script' );
+	script.type = 'text/javascript';
+	script.async = false;
+	script.defer = false;
+	script.src = url;
+
+	if( typeof callback === 'function' ) {
+
+		// Success callback
+		script.onload = script.onreadystatechange = 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 = 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>
+	const head = document.querySelector( 'head' );
+	head.insertBefore( script, head.lastChild );
+
+}

js/utils/util.js

@@ -0,0 +1,269 @@
+/**
+ * Extend object a with the properties of object b.
+ * If there's a conflict, object b takes precedence.
+ *
+ * @param {object} a
+ * @param {object} b
+ */
+export const extend = ( a, b ) => {
+
+	for( let i in b ) {
+		a[ i ] = b[ i ];
+	}
+
+	return a;
+
+}
+
+/**
+ * querySelectorAll but returns an Array.
+ */
+export const queryAll = ( el, selector ) => {
+
+	return Array.from( el.querySelectorAll( selector ) );
+
+}
+
+/**
+ * classList.toggle() with cross browser support
+ */
+export const toggleClass = ( el, className, value ) => {
+	if( value ) {
+		el.classList.add( className );
+	}
+	else {
+		el.classList.remove( className );
+	}
+}
+
+/**
+ * Utility for deserializing a value.
+ *
+ * @param {*} value
+ * @return {*}
+ */
+export const 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}
+ */
+export const distanceBetween = ( a, b ) => {
+
+	let 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
+ */
+export const transformElement = ( element, transform ) => {
+
+	element.style.transform = transform;
+
+}
+
+/**
+ * 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
+ */
+export const closestParent = ( target, selector ) => {
+
+	let 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...
+		let 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;
+
+}
+
+/**
+ * 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
+ */
+export const enterFullscreen = element => {
+
+	element = element || document.documentElement;
+
+	// Check which implementation is available
+	let requestMethod = element.requestFullscreen ||
+						element.webkitRequestFullscreen ||
+						element.webkitRequestFullScreen ||
+						element.mozRequestFullScreen ||
+						element.msRequestFullscreen;
+
+	if( requestMethod ) {
+		requestMethod.apply( element );
+	}
+
+}
+
+/**
+ * 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}
+ */
+export const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {
+
+	// Find all nodes matching the description
+	let nodes = container.querySelectorAll( '.' + classname );
+
+	// Check all matches to find one which is a direct child of
+	// the specified container
+	for( let i = 0; i < nodes.length; i++ ) {
+		let testNode = nodes[i];
+		if( testNode.parentNode === container ) {
+			return testNode;
+		}
+	}
+
+	// If no node was found, create it now
+	let node = document.createElement( tagname );
+	node.className = classname;
+	node.innerHTML = innerHTML;
+	container.appendChild( node );
+
+	return node;
+
+}
+
+/**
+ * Injects the given CSS styles into the DOM.
+ *
+ * @param {string} value
+ */
+export const createStyleSheet = ( value ) => {
+
+	let tag = document.createElement( 'style' );
+	tag.type = 'text/css';
+
+	if( value && value.length > 0 ) {
+		if( tag.styleSheet ) {
+			tag.styleSheet.cssText = value;
+		}
+		else {
+			tag.appendChild( document.createTextNode( value ) );
+		}
+	}
+
+	document.head.appendChild( tag );
+
+	return tag;
+
+}
+
+/**
+ * Returns a key:value hash of all query params.
+ */
+export const getQueryHash = () => {
+
+	let query = {};
+
+	location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, a => {
+		query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
+	} );
+
+	// Basic deserialization
+	for( let i in query ) {
+		let value = query[ i ];
+
+		query[ i ] = deserialize( unescape( value ) );
+	}
+
+	// Do not accept new dependencies via query config to avoid
+	// the potential of malicious script injection
+	if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
+
+	return query;
+
+}
+
+/**
+ * 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]
+ */
+export const getRemainingHeight = ( element, height = 0 ) => {
+
+	if( element ) {
+		let 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;
+
+}

lib/js/html5shiv.js

@@ -1,7 +0,0 @@
-document.createElement('header');
-document.createElement('nav');
-document.createElement('section');
-document.createElement('article');
-document.createElement('aside');
-document.createElement('footer');
-document.createElement('hgroup');