` elements generated by your Markdown. ```html

``` #### 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://github.com/chjj/marked#options-1 markdown: { smartypants: true } }); ``` ### 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 presentation control arrows controls: true, // Hint at where the user can navigate, for example by animating // the down arrow when we first encounter a vertical slide controlsHints: 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, // Set default timing of 2 minutes per slide defaultTiming: 120, // 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, // 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, // 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 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: [ // 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/marked.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 },

		// 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](http://headjs.com/) *(a script loading library)* to be loaded before reveal.js.

### 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

	After 2 seconds the first fragment will be shown.
	After 10 seconds the next fragment will be shown.
	Now, the fragment is displayed for 2 seconds before the next slide is shown.

```

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)
  }
});
```

### 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. Lazy loaded iframes will also unload when the containing slide is no longer visible.

```html

  
  
  

```


### 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 } }
Reveal.getPastSlideCount();
Reveal.getProgress();       // (0 == first slide, 1 == last slide)
Reveal.getSlides();         // Array of all slides
Reveal.getTotalSlides();    // total number of slides

// Returns the speaker notes for the current slide
Reveal.getSlideNotes();

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

### 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 ````, "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 `````` elements. Four different types of backgrounds are supported: color, image, video and iframe.

#### Color Backgrounds
All CSS color formats are supported, like rgba() or hsl().
```html

	Color

```

#### 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. |
```html

	Image


	This background image will be sized to 100px and repeated

```

#### 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. |

```html

	Video

```

#### 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

	Iframe

```

#### 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 config 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://lab.hakim.se/reveal-js/?parallaxBackgroundImage=https%3A%2F%2Fs3.amazonaws.com%2Fhakim-static%2Freveal-js%2Freveal-parallax-1.jpg¶llaxBackgroundSize=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

	This slide will override the presentation transition and zoom!



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

```

You can also use different in and out transitions for the same slide:

```html

    The train goes on …


    and on …


    and stops.


    (Passengers entering and leaving)


    And it starts again.

```


### 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




 
 
```


### 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:

```html

	grow
	shrink
	fade-out
	fade-up (also down, left and right!)
	visible only once
	blue only once
	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.

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. 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 `` to call out a line of code, add the `data-noescape` attribute to the `` element.

```html

	
(def lazy-fib
  (concat
   [0 1]
   ((fn rfib [a b]
        (lazy-cons (+ a b) (rfib b (+ a b)))) 0 1)))
	

```

### 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' });

// 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

```

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 `

Color

Image

This background image will be sized to 100px and repeated

Video

Iframe

This slide will override the presentation transition and zoom!

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

This video will use up the remaining space on the slide