# reveal.js [![Build Status](https://travis-ci.org/hakimel/reveal.js.png?branch=master)](https://travis-ci.org/hakimel/reveal.js) A framework for easily creating beautiful presentations using HTML. [Check out the live demo](http://lab.hakim.se/reveal-js/). reveal.js comes with a broad range of features including [nested slides](https://github.com/hakimel/reveal.js#markup), [markdown contents](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). It's best viewed in a browser with support for CSS 3D transforms but [fallbacks](https://github.com/hakimel/reveal.js/wiki/Browser-Support) are available to make sure your presentation can still be viewed elsewhere. #### More reading in the Wiki: - [Changelog](https://github.com/hakimel/reveal.js/wiki/Changelog): 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. ## rvl.io Slides are written using HTML or markdown but there's also an online editor for those of you who prefer a more traditional user interface. Give it a try at [www.rvl.io](http://www.rvl.io). ## Instructions ### Markup Markup hierarchy needs to be ``
`` where the ``
`` represents one slide and can be repeated indefinitely. If you place multiple ``
``'s inside of another ``
`` 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: ```html
Single Horizontal Slide
Vertical Slide 1
Vertical Slide 2
``` ### Markdown It's possible to write your slides using Markdown. To enable Markdown, add the ```data-markdown``` attribute to your ```
``` elements and wrap the contents in a ```
``` #### 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. ```html
``` ### 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. ```javascript Reveal.initialize({ // 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, // Enable the slide overview mode overview: true, // Vertical centering of slides center: true, // Loop the presentation loop: false, // Change the presentation direction to be RTL rtl: 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, // Enable slide navigation via mouse wheel mouseWheel: false, // Apply a 3D roll to links on hover rollingLinks: true, // Transition style transition: 'default', // default/cube/page/concave/zoom/linear/fade/none // Transition speed transitionSpeed: 'default', // default/fast/slow }); ``` Note that the new default vertical centering option will break compatibility with slides that were using transitions with backgrounds (`cube` and `page`). To restore the previous behavior, set `center` to `false`. 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: 1.0 }); ``` ### 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: [ // 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
elements { src: 'plugin/markdown/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } }, { src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } }, // Syntax highlight for 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, condition: function() { return !!document.body.classList; } }, // Speaker notes { src: 'plugin/notes/notes.js', async: true, condition: function() { return !!document.body.classList; } }, // Remote control your reveal.js presentation using a touch device { src: 'plugin/remotes/remotes.js', async: true, condition: function() { return !!document.body.classList; } } ] }); ``` 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 ### API The ``Reveal`` class provides a minimal 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(); Reveal.toggleOverview(); // Retrieves the previous and current slide elements Reveal.getPreviousSlide(); Reveal.getCurrentSlide(); Reveal.getIndices(); // { h: 0, v: 0 } } ``` ### States If you set ``data-state="somestate"`` on a slide ``
``, "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 ); ``` ### Ready event The 'ready' event is fired when reveal.js has loaded all (synchronous) dependencies and is ready to start navigating. ```javascript Reveal.addEventListener( 'ready', function( event ) { // event.currentSlide, event.indexh, event.indexv } ); ``` ### 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. 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 } ); ``` ### 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 (```
```): ```html Link Link ``` 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 ``` ### Alternating 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

This slide will override the presentation transition and zoom!

Choose from three transition speeds: default, fast or slow!

``` Note that this does not work with the page and cube transitions. ### Fragments Fragments are used to highlight individual elements on a slide. Every elmement 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/#/16 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

grow

shrink

roll-in

fade-out

highlight-red

highlight-green

highlight-blue

``` 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
I'll fade in, then out
``` The display order of fragments can be controlled using the ```data-fragment-index``` attribute. ```html

Appears last

Appears first

Appears second

``` ### Fragment events When a slide fragment is either shown or hidden reveal.js will dispatch an event. ```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](http://softwaremaniacs.org/soft/highlight/en/) for code syntax highlighting. Below is an example with clojure code that will be syntax highlighted: ```html 

(def lazy-fib
  (concat
   [0 1]
   ((fn rfib [a b]
        (lazy-cons (+ a b) (rfib b (+ a b)))) 0 1)))
``` ### Overview mode Press "Esc" key 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. ## 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). Here's an example of an exported presentation that's been uploaded to SlideShare: http://www.slideshare.net/hakimel/revealjs-13872948. 1. Open your presentation with [css/print/pdf.css](https://github.com/hakimel/reveal.js/blob/master/css/print/pdf.css) included on the page. The default index HTML lets you add *print-pdf* anywhere in the query to include the stylesheet, for example: [lab.hakim.se/reveal-js?print-pdf](http://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**. ![Chrome Print Settings](https://s3.amazonaws.com/hakim-static/reveal-js/pdf-print-settings.png) ## Theming The framework comes with a few different themes included: - default: Gray background, white text, blue links - 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 Each theme is available as a separate stylesheet. To change theme you will need to replace **default** below with your desired theme name in index.html: ```html ``` 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). ## Development Environment reveal.js is built using the task-based command line build tool [grunt.js](http://gruntjs.com) ([installation instructions](http://gruntjs.com/getting-started#installing-the-cli)). With Node.js and grunt.js installed, you need to start by running ```npm install``` in the reveal.js root. When the dependencies have been installed you should run ```grunt watch``` to start monitoring files for changes. If you want to customise reveal.js without running grunt.js you can alter the HTML to point to the uncompressed source files (css/reveal.css & js/reveal.js). ### 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 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. By default notes are written using standard HTML, see below, but you can add a ```data-markdown``` attribute to the ```