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. There's also a fully featured visual editor and platform for sharing reveal.js presentations at slides.com.
- Online Editor
- Instructions
- Configuration
- Presentation Size
- Dependencies
- Ready Event
- Auto-sliding
- Keyboard Bindings
- Touch Navigation
- Lazy Loading
- API
- PDF Export
- Theming
- Speaker Notes
- Multiplexing
- MathJax
- Installation
- License
- Changelog: Up-to-date version history.
- Examples: Presentations created with reveal.js, add your own!
- Browser Support: Explanation of browser support and fallbacks.
- Plugins: A list of plugins that can be used to extend reveal.js.
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.
Here's a barebones example of a fully working reveal.js presentation:
<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:
<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>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 Flavored 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>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 note:). 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. The following example customises all available options:
<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>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>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>We use marked to parse Markdown. To customise marked's rendering, you can pass in options when configuring Reveal:
Reveal.initialize({
// Options which are passed into marked
// See https://github.com/chjj/marked#options-1
markdown: {
smartypants: true
}
});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,
// Randomizes the order of slides each time the presentation loads
shuffle: 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,
// Flags if speaker notes should be visible to all viewers
showNotes: false,
// 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,
// 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: '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,
// 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 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 });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: 1.5
});If you wish to disable this behavior and do your own scaling (e.g. using media queries), try these settings:
Reveal.initialize({
...
width: "100%",
height: "100%",
margin: 0,
minScale: 1,
maxScale: 1
});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 },
// 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
To load these dependencies, reveal.js requires head.js (a script loading library) to be loaded before reveal.js.
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().
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.
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:
// 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>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.
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)
}
});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.
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. Lazy loaded iframes will also unload when the containing slide is no longer visible.
<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>The Reveal object exposes 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();
// Randomize the order of slides
Reveal.shuffle();
// Shows a help overlay with keyboard shortcuts
Reveal.showHelp();
// Toggle presentation states, optionally pass true/false to force on/off
Reveal.toggleOverview();
Reveal.togglePause();
Reveal.toggleAutoSlide();
// 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 } }
Reveal.getProgress(); // 0-1
Reveal.getTotalSlides();
// Returns the speaker notes for the current slide
Reveal.getSlideNotes();
// State checks
Reveal.isFirstSlide();
Reveal.isLastSlide();
Reveal.isOverview();
Reveal.isPaused();
Reveal.isAutoSliding();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), 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
} );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.
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 1If 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 );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.
All CSS color formats are supported, like rgba() or hsl().
<section data-background-color="#ff0000">
<h2>Color</h2>
</section>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 on MDN. |
| data-background-position | center | See background-position on MDN. |
| data-background-repeat | no-repeat | See background-repeat on MDN. |
<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>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. |
<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>