barthez / wroc_love.rb

wroc_love.rb conference summary

reveal.js

A framework for easily creating beautiful presentations using HTML. Check out the live demo.

reveal.js comes with a broad range of features including nested slides, Markdown contents, PDF export, speaker notes and a JavaScript API. It's best viewed in a modern browser but fallbacks are available to make sure your presentation can still be viewed elsewhere.

More reading:

• Installation: Step-by-step instructions for getting reveal.js running on your computer.
• Changelog: Up-to-date version history.
• Examples: Presentations created with reveal.js, add your own!
• Browser Support: Explanation of browser support and fallbacks.

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 http://slides.com.

Instructions

Markup

Markup hierarchy needs to be <div class="reveal"> <div class="slides"> <section> where the <section> represents one slide and can be repeated indefinitely. If you place multiple <section>'s 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 it will be included in the horizontal sequence. For example:

<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 <script type="text/template"> like the example below.

This is based on data-markdown from Paul Irish modified to use marked to support Github Flavoured Markdown. Sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).

<section data-markdown>
	<script type="text/template">
		## Page title

		A paragraph with some text and a [link](http://hakim.se).
	</script>
</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-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.

<section data-markdown="example.md"  
         data-separator="^\n\n\n"  
         data-separator-vertical="^\n\n"  
         data-separator-notes="^Note:"  
         data-charset="iso-8859-15">
</section>

Element Attributes

Special syntax (in html comment) is available for adding attributes to Markdown elements. This is useful for fragments, amongst other things.

<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 (in html comment) is available for adding attributes to the slide <section> elements generated by your Markdown.

<section data-markdown>
	<script type="text/template">
	<!-- .slide: data-background="#ff0000" -->
		Markdown content
	</script>
</section>

Configuration

At the end of your page you need to initialize reveal by running the following code. Note that all config values are optional and will default as specified below.

Reveal.initialize({

	// Display controls in the bottom right corner
	controls: true,

	// Display a presentation progress bar
	progress: true,

	// Display the page number of the current slide
	slideNumber: false,

	// Push each slide change to the browser history
	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,

	// Turns fragments on and off globally
	fragments: 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 questionmark
	// key is pressed
	help: true,

	// 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,

	// Enable slide navigation via mouse wheel
	mouseWheel: false,

	// Hides the address bar on mobile devices
	hideAddressBar: true,

	// Opens links in an iframe preview overlay
	previewLinks: false,

	// Transition style
	transition: 'default', // none/fade/slide/convex/concave/zoom

	// Transition speed
	transitionSpeed: 'default', // default/fast/slow

	// Transition style for full page slide backgrounds
	backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom

	// Number of slides away from the current that are visible
	viewDistance: 3,

	// 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"


});

The configuration can be updated after initialization using the configure method:

// Turn autoSlide off
Reveal.configure({ autoSlide: 0 });

// Start auto-sliding every 5s
Reveal.configure({ autoSlide: 5000 });

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:

Reveal.initialize({
	dependencies: [
		// Cross-browser shim that fully implements classList - https://github.com/eligrey/classList.js/
		{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },

		// 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, callback: function() { hljs.initHighlightingOnLoad(); } },

		// Zoom in and out with Alt+click
		{ src: 'plugin/zoom-js/zoom.js', async: true },

		// Speaker notes
		{ src: 'plugin/notes/notes.js', async: true },

		// Remote control your reveal.js presentation using a touch device
		{ src: 'plugin/remotes/remotes.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

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:

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: 1.0

});

Auto-sliding

Presentations can be configure 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:

// 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:

<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>

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:

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)
  }
});

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.

<section>
  <img data-src="image.png">
  <iframe data-src="http://slides.com">
  <video>
    <source data-src="video.webm" type="video/webm" />
    <source data-src="video.mp4" type="video/mp4" />
  </video>
</section>

API

The Reveal class provides a JavaScript API for controlling navigation and reading state:

// Navigation
Reveal.slide( indexh, indexv, indexf );
Reveal.left();
Reveal.right();
Reveal.up();
Reveal.down();
Reveal.prev();
Reveal.next();
Reveal.prevFragment();
Reveal.nextFragment();
Reveal.toggleOverview();
Reveal.togglePause();
Reveal.toggleAutoSlide();

// Retrieves the previous and current slide elements
Reveal.getPreviousSlide();
Reveal.getCurrentSlide();

Reveal.getIndices(); // { h: 0, v: 0 } }

// State checks
Reveal.isFirstSlide();
Reveal.isLastSlide();
Reveal.isOverview();
Reveal.isPaused();
Reveal.isAutoSliding();

Ready Event

The 'ready' event is fired when reveal.js has loaded all (synchronous) dependencies and is ready to start navigating.

Reveal.addEventListener( 'ready', function( event ) {
	// event.currentSlide, event.indexh, event.indexv
} );

Slide Changed Event

An '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), 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.

Reveal.addEventListener( 'slidechanged', function( event ) {
	// event.previousSlide, event.currentSlide, event.indexh, event.indexv
} );

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:

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. Below are a few examples.

<section data-background="#ff0000">
	<h2>All CSS color formats are supported, like rgba() or hsl().</h2>
</section>
<section data-background="http://example.com/image.png">
	<h2>This slide will have a full-size background image.</h2>
</section>
<section data-background="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>
<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">
	<h2>Video. Multiple sources can be defined using a comma separated list.</h2>
</section>
<section data-background-iframe="https://slides.com">
	<h2>Embeds a web page as a background. Note that the page won't be interactive.</h2>
</section>

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 two following config properties when initializing reveal.js (the third one is optional).

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)

	// This slide transition gives best results:
	transition: 'slide'

});

Make sure that the background size is much bigger than screen size to allow for some scrolling. View example.

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:

<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>

Note that this does not work with the page and cube transitions.

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">):

<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.

<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://lab.hakim.se/reveal-js/#/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:

<section>
	<p class="fragment grow">grow</p>
	<p class="fragment shrink">shrink</p>
	<p class="fragment roll-in">roll-in</p>
	<p class="fragment fade-out">fade-out</p>
	<p class="fragment current-visible">visible only once</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.

<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.

<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.

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 for code syntax highlighting. Below is an example with clojure code that will be syntax highlighted. When the data-trim attribute is present surrounding whitespace is automatically removed.

<section>
	<pre><code data-trim>
(def lazy-fib
  (concat
   [0 1]
   ((fn rfib [a b]
        (lazy-cons (+ a b) (rfib b (+ a b)))) 0 1)))
	</code></pre>
</section>

Slide number

If you would like to display the page number of the current slide you can do so using the slideNumber configuration value.

Reveal.configure({ slideNumber: true });

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:

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

Embedded HTML5 <video>/<audio> and YouTube iframes are automatically paused when you navigate away from a slide. This can be disabled by decorating your element with a data-ignore attribute.

Add data-autoplay to your media element if you want it to automatically start playing when the slide is shown:

<video data-autoplay src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>

Additionally the framework automatically pushes two post messages to all 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:

<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

PDF Export

Presentations can be exported to PDF via a special print stylesheet. This feature requires that you use Google Chrome. Here's an example of an exported presentation that's been uploaded to SlideShare: http://www.slideshare.net/hakimel/revealjs-300.

1. Open your presentation with print-pdf included anywhere in the query string. This triggers the default index HTML to load the PDF print stylesheet (css/print/pdf.css). You can test this with lab.hakim.se/reveal-js?print-pdf.
2. Open the in-browser print dialog (CMD+P).
3. Change the Destination setting to Save as PDF.
4. Change the Layout to Landscape.
5. Change the Margins to None.
6. Click Save.

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 white 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:

<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.

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.

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.

When used locally, this feature requires that reveal.js runs from a local web server.

<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:

<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.

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:

Reveal.initialize({
	...

	dependencies: [
		{ src: 'socket.io/socket.io.js', async: true },
		{ src: 'plugin/notes-server/client.js', async: true }
	]
});

Then:

1. Install Node.js
2. Run npm install
3. Run node plugin/notes-server

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 http://revealjs.jit.su/.

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

More details:

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:

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: 'revealjs.jit.su:80' // Location of socket.io server
	},

	// Don't forget to add the dependencies
	dependencies: [
		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.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 http://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:

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: 'revealjs.jit.su:80' // Location of socket.io server
	},

	// Don't forget to add the dependencies
	dependencies: [
		{ src: '//cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.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 use the socket.io server at http://revealjs.jit.su.

You'll need to generate a unique secret and token pair for your master and client presentations. To do so, visit http://example.com/token, where http://example.com is the location of your socket.io server. Or if you're going to use the socket.io server at http://revealjs.jit.su, visit http://revealjs.jit.su/token.

You are very welcome to point your presentations at the Socket.io server running at http://revealjs.jit.su, but availability and stability are not guaranteed. For anything mission critical I recommend you run your own server. It is simple to deploy to nodejitsu, heroku, your own environment, etc.

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 http://revealjs.jit.su. (Open http://revealjs.jit.su in two browsers. Navigate through the slides on one, and the other will update to match.)

Example configuration:

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/0.9.16/socket.io.min.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 http://revealjs.jit.su 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:

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/0.9.16/socket.io.min.js', async: true },
		{ src: 'plugin/multiplex/master.js', async: true },
		{ src: 'plugin/multiplex/client.js', async: true }

		// other dependencies...
	]
});

Leap Motion

The Leap Motion plugin lets you utilize your Leap Motion device to control basic navigation of your presentation. The gestures currently supported are:

1 to 2 fingers

Pointer — Point to anything on screen. Move your finger past the device to expand the pointer.

1 hand + 3 or more fingers (left/right/up/down)

Navigate through your slides. See config options to invert movements.

2 hands upwards

Toggle the overview mode. Do it a second time to exit the overview.

Config Options

You can edit the following options:

Property	Default	Description
autoCenter	true	Center the pointer based on where you put your finger into the leap motions detection field.
gestureDelay	500	How long to delay between gestures in milliseconds.
naturalSwipe	true	Swipe as though you were touching a touch screen. Set to false to invert.
pointerColor	#00aaff	The color of the pointer.
pointerOpacity	0.7	The opacity of the pointer.
pointerSize	15	The minimum height and width of the pointer.
pointerTolerance	120	Bigger = slower pointer.

Example configuration:

Reveal.initialize({

	// other options...

	leap: {
		naturalSwipe   : false,    // Invert swipe gestures
		pointerOpacity : 0.5,      // Set pointer opacity to 0.5
		pointerColor   : '#d80000' // Red pointer
	},

	dependencies: [
		{ src: 'plugin/leap/leap.js', async: true }
	]

});

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 library. To use it you'll need to include it as a reveal.js dependency, find our more about dependencies here.

The plugin defaults to using 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.

Reveal.initialize({

	// other options ...

	math: {
		mathjax: 'http://cdn.mathjax.org/mathjax/latest/MathJax.js',
		config: 'TeX-AMS_HTML-full'  // See http://docs.mathjax.org/en/latest/config-files.html
	},
	
	dependencies: [
		{ src: 'plugin/math/math.js', async: true }
	]

});

Read MathJax's documentation if you need HTTPS delivery or serving of specific versions for stability.

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

2. Install Grunt

3. Clone the reveal.js repository

   $ git clone https://github.com/hakimel/reveal.js.git

4. Navigate to the reveal.js folder

   $ cd reveal.js

5. Install dependencies

   $ npm install

6. Serve the presentation and monitor source files for changes

   $ grunt serve

7. Open http://localhost:8000 to view your presentation

   You can change the port by using grunt serve --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)

License

MIT licensed

Copyright (C) 2015 Hakim El Hattab, http://hakim.se