reveal.js: HTML5 based Slide Presentation Tool

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A CSS 3D slideshow tool for quickly creating good looking HTML presentations. Doesn’t rely on any external libraries but highlight.js is included by default for code highlighting.

Note that this requires a browser with support for CSS 3D transforms and classList. If CSS 3D support is not detected, the presentation will degrade to less exciting 2D transitions. A classList polyfill is incuded to make this work in < iOS 5, < Safari 5.1 and IE.

Curious about how it looks in action? Check out the demo page.



Markup heirarchy 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. For example:

<div class="reveal">
    <div class="slides"> 
        <section>Single Horizontal Slide</section>
            <section>Vertical Slide 1</section>
            <section>Vertical Slide 2</section>


It’s possible to write your slides using Markdown. To enable Markdown simply add the data-markdown attribute to your <section> elements and reveal.js will automatically load the JavaScript parser.

This is based on data-markdown from Paul Irish which in turn uses showdown. This is sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks). Updates to come.

<section data-markdown>
    ## Page title

    A paragraph with some text and a [link](


At the end of your page, after <script src="js/reveal.js"></script>, you need to initialize reveal by running the following code. Note that all config values are optional and will default as specified below.

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

    // Display a presentation progress bar
    progress: true,

    // Push each slide change to the browser history
    history: false,

    // Enable keyboard shortcuts for navigation
    keyboard: true,

    // Loop the presentation
    loop: false,

    // Number of milliseconds between automatically proceeding to the 
    // next slide, disabled when set to 0
    autoSlide: 0,

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

    // Apply a 3D roll to links on hover
    rollingLinks: true,

    // UI style
    theme: 'default', // default/neon/beige

    // Transition style
    transition: 'default' // default/cube/page/concave/linear(2d)


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

// Navigation
Reveal.navigateTo( indexh, indexv );

// Retrieves the previous and current slide elements

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


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 change 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.

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

Fragment events

When a slide fragment is either shown or hidden reveal.js will dispatch an event.

Reveal.addEventListener( 'fragmentshown', function( event ) {
    // event.fragment = the fragment DOM element
} );
Reveal.addEventListener( 'fragmenthidden', function( event ) {
    // event.fragment = the fragment DOM element
} );

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)

Speaker Notes

If you’re interested in using speaker notes, reveal.js comes with a Node server that allows you to deliver your presentation in one browser while viewing speaker notes in another.

To include speaker notes in your presentation, simply add an <aside class="notes"> element to any slide. These notes will be hidden in the main presentation view.

You’ll also need to install Node.js; then, install the server dependencies by running npm install.

Once Node.js and the dependencies are installed, run the following command from the root directory:

    node plugin/speakernotes

By default, the slides will be served at localhost:1947.

You can change the appearance of the speaker notes by editing the file at plugin/speakernotes/notes.html.

Known Issues

  • The notes page is supposed to show the current slide and the next slide, but when it first starts, it always shows the first slide in both positions.


Send me a link if you used reveal.js for a project or presentation.


1.5 (master/beta)

  • New API method Reveal.getPreviousSlide()
  • New API method Reveal.getCurrentSlide()
  • New API method Reveal.getIndices()
  • Fixed bug where the .present class was sometimes left on the previous slide
  • Added support for slides written using markdown
  • Added helped method Reveal.getQueryHash()


  • Main #reveal container is now selected via a class instead of ID
  • API methods for adding or removing all event listeners
  • The slidechange event now includes currentSlide and previousSlide
  • Fixed bug where slidechange was firing twice when history was enabled
  • Folder structure updates for scalability (see /lib & /plugin)
  • Slide notes by rmurphey
  • Bumped up default font-size for code samples
  • Added beige theme
  • Added autoSlide config
  • Bug fix: The slidechanged event is now firing upon hashchange. Thanks basecode
  • Bug fix: JS error when the progress option was true but there was no progress DOM element
  • keyboard config flag for disabling all keyboard navigation


  • Revised keyboard shortcuts, including ESC for overview, N for next, P for previous. Thanks mahemoff
  • Added support for looped presentations via config
  • Fixed IE9 fallback
  • Added event binding methods (Reveal.addEventListener, Reveal.removeEventListener)
  • Added slidechanged event
  • Added print styles. Thanks skypanther
  • The address bar now hides automatically on mobile browsers
  • Space and return keys can be used to exit the overview mode
  • Events for fragment states (fragmentshown / fragmenthidden)
  • Support for swipe navigation on touch devices. Thanks akiersky
  • Support for pinch to overview on touch devices


  • Big changes to DOM structure:
    • Previous #main wrapper is now called #reveal
    • Slides were moved one level deeper, into #reveal .slides
    • Controls and progress bar were moved into #reveal
  • CSS is now much more explicit, rooted at #reveal, to prevent conflicts
  • Config option for disabling updates to URL, defaults to true
  • Anchors with image children no longer rotate in 3D on hover
  • Support for mouse wheel navigation (naugtur)
  • Delayed updates to URL hash to work around a bug in Chrome
  • Included a classList polyfill for IE9
  • Support for wireless presenter keys
  • States can now be applied as classes on the document element by adding data-state on a slide


  • Added an optional presentation progress bar
  • Images wrapped in anchors no longer unexpectedly flip in 3D
  • Slides that contain other slides are given the ‘stack’ class
  • Added transition option for specifying transition styles
  • Added theme option for specifying UI styles
  • New transitions: box & page
  • New theme: neon


  • New and improved style
  • Added controls in bottom right which indicate where you can navigate
  • Reveal views in iteratively by giving them the .fragment class
  • Code sample syntax highlighting thanks to highlight.js
  • Initialization options (toggling controls, toggling rolling links, transition theme)


  • Added licensing terms
  • Fixed broken links on touch devices


  • Refactored code and added inline documentation
  • Slides now have unique URL’s
  • A basic API to invoke navigation was added


  • First release
  • Transitions and a white theme


MIT licensed

Copyright (C) 2012 Hakim El Hattab,

via Hacker News

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