Merge "remove 3rd part files with MIT or BSD license"

1 files changed, 0 insertions, 4619 deletions

diff --git a/docs/com/js/reveal.js b/docs/com/js/reveal.js
deleted file mode 100755
index a768d6880..000000000
--- a/docs/com/js/reveal.js
+++ /dev/null
@@ -1,4619 +0,0 @@
-/*!
- * reveal.js
- * http://lab.hakim.se/reveal-js
- * MIT licensed
- *
- * Copyright (C) 2015 Hakim El Hattab, http://hakim.se
- */
-(function( root, factory ) {
-	if( typeof define === 'function' && define.amd ) {
-		// AMD. Register as an anonymous module.
-		define( function() {
-			root.Reveal = factory();
-			return root.Reveal;
-		} );
-	} else if( typeof exports === 'object' ) {
-		// Node. Does not work with strict CommonJS.
-		module.exports = factory();
-	} else {
-		// Browser globals.
-		root.Reveal = factory();
-	}
-}( this, function() {
-
-	'use strict';
-
-	var Reveal;
-
-	var SLIDES_SELECTOR = '.slides section',
-		HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
-		VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
-		HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
-
-		// Configuration defaults, can be overridden at initialization time
-		config = {
-
-			// The "normal" size of the presentation, aspect ratio will be preserved
-			// when the presentation is scaled to fit different resolutions
-			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,
-
-			// 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,
-
-			// Optional function that blocks keyboard events when retuning false
-			keyboardCondition: null,
-
-			// 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,
-
-			// Flags if it should be possible to pause the presentation (blackout)
-			pause: 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,
-
-			// Enable slide navigation via mouse wheel
-			mouseWheel: false,
-
-			// Apply a 3D roll to links on hover
-			rollingLinks: false,
-
-			// Hides the address bar on mobile devices
-			hideAddressBar: true,
-
-			// Opens links in an iframe preview overlay
-			previewLinks: false,
-
-			// Exposes the reveal.js API through window.postMessage
-			postMessage: true,
-
-			// Dispatches all reveal.js events to the parent window through postMessage
-			postMessageEvents: false,
-
-			// Focuses body when page changes visiblity to ensure keyboard shortcuts work
-			focusBodyOnPageVisibilityChange: true,
-
-			// 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
-
-			// Parallax background image
-			parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
-
-			// Parallax background size
-			parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
-
-			// Amount of pixels to move the parallax background per slide step
-			parallaxBackgroundHorizontal: null,
-			parallaxBackgroundVertical: null,
-
-			// Number of slides away from the current that are visible
-			viewDistance: 3,
-
-			// Script dependencies to load
-			dependencies: []
-
-		},
-
-		// Flags if reveal.js is loaded (has dispatched the 'ready' event)
-		loaded = false,
-
-		// Flags if the overview mode is currently active
-		overview = false,
-
-		// The horizontal and vertical index of the currently active slide
-		indexh,
-		indexv,
-
-		// The previous and current slide HTML elements
-		previousSlide,
-		currentSlide,
-
-		previousBackground,
-
-		// Slides may hold a data-state attribute which we pick up and apply
-		// as a class to the body. This list contains the combined state of
-		// all current slides.
-		state = [],
-
-		// The current scale of the presentation (see width/height config)
-		scale = 1,
-
-		// CSS transform that is currently applied to the slides container,
-		// split into two groups
-		slidesTransform = { layout: '', overview: '' },
-
-		// Cached references to DOM elements
-		dom = {},
-
-		// Features supported by the browser, see #checkCapabilities()
-		features = {},
-
-		// Client is a mobile device, see #checkCapabilities()
-		isMobileDevice,
-
-		// Throttles mouse wheel navigation
-		lastMouseWheelStep = 0,
-
-		// Delays updates to the URL due to a Chrome thumbnailer bug
-		writeURLTimeout = 0,
-
-		// Flags if the interaction event listeners are bound
-		eventsAreBound = false,
-
-		// The current auto-slide duration
-		autoSlide = 0,
-
-		// Auto slide properties
-		autoSlidePlayer,
-		autoSlideTimeout = 0,
-		autoSlideStartTime = -1,
-		autoSlidePaused = false,
-
-		// Holds information about the currently ongoing touch input
-		touch = {
-			startX: 0,
-			startY: 0,
-			startSpan: 0,
-			startCount: 0,
-			captured: false,
-			threshold: 40
-		},
-
-		// Holds information about the keyboard shortcuts
-		keyboardShortcuts = {
-			'N  ,  SPACE':			'Next slide',
-			'P':					'Previous slide',
-			'←  ,  H':		'Navigate left',
-			'→  ,  L':		'Navigate right',
-			'↑  ,  K':		'Navigate up',
-			'↓  ,  J':		'Navigate down',
-			'Home':					'First slide',
-			'End':					'Last slide',
-			'B  ,  .':				'Pause',
-			'F':					'Fullscreen',
-			'ESC, O':				'Slide overview'
-		};
-
-	/**
-	 * Starts up the presentation if the client is capable.
-	 */
-	function initialize( options ) {
-
-		checkCapabilities();
-
-		if( !features.transforms2d && !features.transforms3d ) {
-			document.body.setAttribute( 'class', 'no-transforms' );
-
-			// Since JS won't be running any further, we load all lazy
-			// loading elements upfront
-			var images = toArray( document.getElementsByTagName( 'img' ) ),
-				iframes = toArray( document.getElementsByTagName( 'iframe' ) );
-
-			var lazyLoadable = images.concat( iframes );
-
-			for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
-				var element = lazyLoadable[i];
-				if( element.getAttribute( 'data-src' ) ) {
-					element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
-					element.removeAttribute( 'data-src' );
-				}
-			}
-
-			// If the browser doesn't support core features we won't be
-			// using JavaScript to control the presentation
-			return;
-		}
-
-		// Cache references to key DOM elements
-		dom.wrapper = document.querySelector( '.reveal' );
-		dom.slides = document.querySelector( '.reveal .slides' );
-
-		// Force a layout when the whole page, incl fonts, has loaded
-		window.addEventListener( 'load', layout, false );
-
-		var query = Reveal.getQueryHash();
-
-		// Do not accept new dependencies via query config to avoid
-		// the potential of malicious script injection
-		if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
-
-		// Copy options over to our config object
-		extend( config, options );
-		extend( config, query );
-
-		// Hide the address bar in mobile browsers
-		hideAddressBar();
-
-		// Loads the dependencies and continues to #start() once done
-		load();
-
-	}
-
-	/**
-	 * Inspect the client to see what it's capable of, this
-	 * should only happens once per runtime.
-	 */
-	function checkCapabilities() {
-
-		features.transforms3d = 'WebkitPerspective' in document.body.style ||
-								'MozPerspective' in document.body.style ||
-								'msPerspective' in document.body.style ||
-								'OPerspective' in document.body.style ||
-								'perspective' in document.body.style;
-
-		features.transforms2d = 'WebkitTransform' in document.body.style ||
-								'MozTransform' in document.body.style ||
-								'msTransform' in document.body.style ||
-								'OTransform' in document.body.style ||
-								'transform' in document.body.style;
-
-		features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
-		features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
-
-		features.canvas = !!document.createElement( 'canvas' ).getContext;
-
-		features.touch = !!( 'ontouchstart' in window );
-
-		// Transitions in the overview are disabled in desktop and
-		// mobile Safari due to lag
-		features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent );
-
-		isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent );
-
-	}
-
-    /**
-     * Loads the dependencies of reveal.js. Dependencies are
-     * defined via the configuration option 'dependencies'
-     * and will be loaded prior to starting/binding reveal.js.
-     * Some dependencies may have an 'async' flag, if so they
-     * will load after reveal.js has been started up.
-     */
-	function load() {
-
-		var scripts = [],
-			scriptsAsync = [],
-			scriptsToPreload = 0;
-
-		// Called once synchronous scripts finish loading
-		function proceed() {
-			if( scriptsAsync.length ) {
-				// Load asynchronous scripts
-				head.js.apply( null, scriptsAsync );
-			}
-
-			start();
-		}
-
-		function loadScript( s ) {
-			head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
-				// Extension may contain callback functions
-				if( typeof s.callback === 'function' ) {
-					s.callback.apply( this );
-				}
-
-				if( --scriptsToPreload === 0 ) {
-					proceed();
-				}
-			});
-		}
-
-		for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
-			var s = config.dependencies[i];
-
-			// Load if there's no condition or the condition is truthy
-			if( !s.condition || s.condition() ) {
-				if( s.async ) {
-					scriptsAsync.push( s.src );
-				}
-				else {
-					scripts.push( s.src );
-				}
-
-				loadScript( s );
-			}
-		}
-
-		if( scripts.length ) {
-			scriptsToPreload = scripts.length;
-
-			// Load synchronous scripts
-			head.js.apply( null, scripts );
-		}
-		else {
-			proceed();
-		}
-
-	}
-
-	/**
-	 * Starts up reveal.js by binding input events and navigating
-	 * to the current URL deeplink if there is one.
-	 */
-	function start() {
-
-		// Make sure we've got all the DOM elements we need
-		setupDOM();
-
-		// Listen to messages posted to this window
-		setupPostMessage();
-
-		// Prevent iframes from scrolling the slides out of view
-		setupIframeScrollPrevention();
-
-		// Resets all vertical slides so that only the first is visible
-		resetVerticalSlides();
-
-		// Updates the presentation to match the current configuration values
-		configure();
-
-		// Read the initial hash
-		readURL();
-
-		// Update all backgrounds
-		updateBackground( true );
-
-		// Notify listeners that the presentation is ready but use a 1ms
-		// timeout to ensure it's not fired synchronously after #initialize()
-		setTimeout( function() {
-			// Enable transitions now that we're loaded
-			dom.slides.classList.remove( 'no-transition' );
-
-			loaded = true;
-
-			dispatchEvent( 'ready', {
-				'indexh': indexh,
-				'indexv': indexv,
-				'currentSlide': currentSlide
-			} );
-		}, 1 );
-
-		// Special setup and config is required when printing to PDF
-		if( isPrintingPDF() ) {
-			removeEventListeners();
-
-			// The document needs to have loaded for the PDF layout
-			// measurements to be accurate
-			if( document.readyState === 'complete' ) {
-				setupPDF();
-			}
-			else {
-				window.addEventListener( 'load', setupPDF );
-			}
-		}
-
-	}
-
-	/**
-	 * Finds and stores references to DOM elements which are
-	 * required by the presentation. If a required element is
-	 * not found, it is created.
-	 */
-	function setupDOM() {
-
-		// Prevent transitions while we're loading
-		dom.slides.classList.add( 'no-transition' );
-
-		// Background element
-		dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
-
-		// Progress bar
-		dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
-		dom.progressbar = dom.progress.querySelector( 'span' );
-
-		// Arrow controls
-		createSingletonNode( dom.wrapper, 'aside', 'controls',
-			'<button class="navigate-left" aria-label="previous slide"></button>' +
-			'<button class="navigate-right" aria-label="next slide"></button>' +
-			'<button class="navigate-up" aria-label="above slide"></button>' +
-			'<button class="navigate-down" aria-label="below slide"></button>' );
-
-		// Slide number
-		dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
-
-		// Element containing notes that are visible to the audience
-		dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
-		dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
-
-		// Overlay graphic which is displayed during the paused mode
-		createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
-
-		// Cache references to elements
-		dom.controls = document.querySelector( '.reveal .controls' );
-		dom.theme = document.querySelector( '#theme' );
-
-		dom.wrapper.setAttribute( 'role', 'application' );
-
-		// There can be multiple instances of controls throughout the page
-		dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
-		dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
-		dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
-		dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
-		dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
-		dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
-
-		dom.statusDiv = createStatusDiv();
-	}
-
-	/**
-	 * Creates a hidden div with role aria-live to announce the
-	 * current slide content. Hide the div off-screen to make it
-	 * available only to Assistive Technologies.
-	 */
-	function createStatusDiv() {
-
-		var statusDiv = document.getElementById( 'aria-status-div' );
-		if( !statusDiv ) {
-			statusDiv = document.createElement( 'div' );
-			statusDiv.style.position = 'absolute';
-			statusDiv.style.height = '1px';
-			statusDiv.style.width = '1px';
-			statusDiv.style.overflow ='hidden';
-			statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
-			statusDiv.setAttribute( 'id', 'aria-status-div' );
-			statusDiv.setAttribute( 'aria-live', 'polite' );
-			statusDiv.setAttribute( 'aria-atomic','true' );
-			dom.wrapper.appendChild( statusDiv );
-		}
-		return statusDiv;
-
-	}
-
-	/**
-	 * Configures the presentation for printing to a static
-	 * PDF.
-	 */
-	function setupPDF() {
-
-		var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
-
-		// Dimensions of the PDF pages
-		var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
-			pageHeight = Math.floor( slideSize.height * ( 1 + config.margin  ) );
-
-		// Dimensions of slides within the pages
-		var slideWidth = slideSize.width,
-			slideHeight = slideSize.height;
-
-		// Let the browser know what page size we want to print
-		injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
-
-		// Limit the size of certain elements to the dimensions of the slide
-		injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
-
-		document.body.classList.add( 'print-pdf' );
-		document.body.style.width = pageWidth + 'px';
-		document.body.style.height = pageHeight + 'px';
-
-		// Slide and slide background layout
-		toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
-
-			// Vertical stacks are not centred since their section
-			// children will be
-			if( slide.classList.contains( 'stack' ) === false ) {
-				// Center the slide inside of the page, giving the slide some margin
-				var left = ( pageWidth - slideWidth ) / 2,
-					top = ( pageHeight - slideHeight ) / 2;
-
-				var contentHeight = getAbsoluteHeight( slide );
-				var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
-
-				// Center slides vertically
-				if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
-					top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
-				}
-
-				// Position the slide inside of the page
-				slide.style.left = left + 'px';
-				slide.style.top = top + 'px';
-				slide.style.width = slideWidth + 'px';
-
-				// TODO Backgrounds need to be multiplied when the slide
-				// stretches over multiple pages
-				var background = slide.querySelector( '.slide-background' );
-				if( background ) {
-					background.style.width = pageWidth + 'px';
-					background.style.height = ( pageHeight * numberOfPages ) + 'px';
-					background.style.top = -top + 'px';
-					background.style.left = -left + 'px';
-				}
-
-				// If we're configured to `showNotes`, inject them into each slide
-				if( config.showNotes ) {
-					var notes = getSlideNotes( slide );
-					if( notes ) {
-						var notesElement = document.createElement( 'div' );
-						notesElement.classList.add( 'speaker-notes' );
-						notesElement.classList.add( 'speaker-notes-pdf' );
-						notesElement.innerHTML = notes;
-						notesElement.style.bottom = ( 40 - top ) + 'px';
-						slide.appendChild( notesElement );
-					}
-				}
-			}
-
-		} );
-
-		// Show all fragments
-		toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
-			fragment.classList.add( 'visible' );
-		} );
-
-	}
-
-	/**
-	 * This is an unfortunate necessity. Iframes can trigger the
-	 * parent window to scroll, for example by focusing an input.
-	 * This scrolling can not be prevented by hiding overflow in
-	 * CSS so we have to resort to repeatedly checking if the
-	 * browser has decided to offset our slides :(
-	 */
-	function setupIframeScrollPrevention() {
-
-		if( dom.slides.querySelector( 'iframe' ) ) {
-			setInterval( function() {
-				if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
-					dom.wrapper.scrollTop = 0;
-					dom.wrapper.scrollLeft = 0;
-				}
-			}, 500 );
-		}
-
-	}
-
-	/**
-	 * Creates an HTML element and returns a reference to it.
-	 * If the element already exists the existing instance will
-	 * be returned.
-	 */
-	function createSingletonNode( container, tagname, classname, innerHTML ) {
-
-		// Find all nodes matching the description
-		var nodes = container.querySelectorAll( '.' + classname );
-
-		// Check all matches to find one which is a direct child of
-		// the specified container
-		for( var i = 0; i < nodes.length; i++ ) {
-			var testNode = nodes[i];
-			if( testNode.parentNode === container ) {
-				return testNode;
-			}
-		}
-
-		// If no node was found, create it now
-		var node = document.createElement( tagname );
-		node.classList.add( classname );
-		if( typeof innerHTML === 'string' ) {
-			node.innerHTML = innerHTML;
-		}
-		container.appendChild( node );
-
-		return node;
-
-	}
-
-	/**
-	 * Creates the slide background elements and appends them
-	 * to the background container. One element is created per
-	 * slide no matter if the given slide has visible background.
-	 */
-	function createBackgrounds() {
-
-		var printMode = isPrintingPDF();
-
-		// Clear prior backgrounds
-		dom.background.innerHTML = '';
-		dom.background.classList.add( 'no-transition' );
-
-		// Iterate over all horizontal slides
-		toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
-
-			var backgroundStack;
-
-			if( printMode ) {
-				backgroundStack = createBackground( slideh, slideh );
-			}
-			else {
-				backgroundStack = createBackground( slideh, dom.background );
-			}
-
-			// Iterate over all vertical slides
-			toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
-
-				if( printMode ) {
-					createBackground( slidev, slidev );
-				}
-				else {
-					createBackground( slidev, backgroundStack );
-				}
-
-				backgroundStack.classList.add( 'stack' );
-
-			} );
-
-		} );
-
-		// Add parallax background if specified
-		if( config.parallaxBackgroundImage ) {
-
-			dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
-			dom.background.style.backgroundSize = config.parallaxBackgroundSize;
-
-			// Make sure the below properties are set on the element - these properties are
-			// needed for proper transitions to be set on the element via CSS. To remove
-			// annoying background slide-in effect when the presentation starts, apply
-			// these properties after short time delay
-			setTimeout( function() {
-				dom.wrapper.classList.add( 'has-parallax-background' );
-			}, 1 );
-
-		}
-		else {
-
-			dom.background.style.backgroundImage = '';
-			dom.wrapper.classList.remove( 'has-parallax-background' );
-
-		}
-
-	}
-
-	/**
-	 * Creates a background for the given slide.
-	 *
-	 * @param {HTMLElement} slide
-	 * @param {HTMLElement} container The element that the background
-	 * should be appended to
-	 */
-	function createBackground( slide, container ) {
-
-		var data = {
-			background: slide.getAttribute( 'data-background' ),
-			backgroundSize: slide.getAttribute( 'data-background-size' ),
-			backgroundImage: slide.getAttribute( 'data-background-image' ),
-			backgroundVideo: slide.getAttribute( 'data-background-video' ),
-			backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
-			backgroundColor: slide.getAttribute( 'data-background-color' ),
-			backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
-			backgroundPosition: slide.getAttribute( 'data-background-position' ),
-			backgroundTransition: slide.getAttribute( 'data-background-transition' )
-		};
-
-		var element = document.createElement( 'div' );
-
-		// Carry over custom classes from the slide to the background
-		element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
-
-		if( data.background ) {
-			// Auto-wrap image urls in url(...)
-			if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
-				slide.setAttribute( 'data-background-image', data.background );
-			}
-			else {
-				element.style.background = data.background;
-			}
-		}
-
-		// Create a hash for this combination of background settings.
-		// This is used to determine when two slide backgrounds are
-		// the same.
-		if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
-			element.setAttribute( 'data-background-hash', data.background +
-															data.backgroundSize +
-															data.backgroundImage +
-															data.backgroundVideo +
-															data.backgroundIframe +
-															data.backgroundColor +
-															data.backgroundRepeat +
-															data.backgroundPosition +
-															data.backgroundTransition );
-		}
-
-		// Additional and optional background properties
-		if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
-		if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
-		if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
-		if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
-		if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
-
-		container.appendChild( element );
-
-		// If backgrounds are being recreated, clear old classes
-		slide.classList.remove( 'has-dark-background' );
-		slide.classList.remove( 'has-light-background' );
-
-		// If this slide has a background color, add a class that
-		// signals if it is light or dark. If the slide has no background
-		// color, no class will be set
-		var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
-		if( computedBackgroundColor ) {
-			var rgb = colorToRgb( computedBackgroundColor );
-
-			// Ignore fully transparent backgrounds. Some browsers return
-			// rgba(0,0,0,0) when reading the computed background color of
-			// an element with no background
-			if( rgb && rgb.a !== 0 ) {
-				if( colorBrightness( computedBackgroundColor ) < 128 ) {
-					slide.classList.add( 'has-dark-background' );
-				}
-				else {
-					slide.classList.add( 'has-light-background' );
-				}
-			}
-		}
-
-		return element;
-
-	}
-
-	/**
-	 * Registers a listener to postMessage events, this makes it
-	 * possible to call all reveal.js API methods from another
-	 * window. For example:
-	 *
-	 * revealWindow.postMessage( JSON.stringify({
-	 *   method: 'slide',
-	 *   args: [ 2 ]
-	 * }), '*' );
-	 */
-	function setupPostMessage() {
-
-		if( config.postMessage ) {
-			window.addEventListener( 'message', function ( event ) {
-				var data = event.data;
-
-				// Make sure we're dealing with JSON
-				if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
-					data = JSON.parse( data );
-
-					// Check if the requested method can be found
-					if( data.method && typeof Reveal[data.method] === 'function' ) {
-						Reveal[data.method].apply( Reveal, data.args );
-					}
-				}
-			}, false );
-		}
-
-	}
-
-	/**
-	 * Applies the configuration settings from the config
-	 * object. May be called multiple times.
-	 */
-	function configure( options ) {
-
-		var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
-
-		dom.wrapper.classList.remove( config.transition );
-
-		// New config options may be passed when this method
-		// is invoked through the API after initialization
-		if( typeof options === 'object' ) extend( config, options );
-
-		// Force linear transition based on browser capabilities
-		if( features.transforms3d === false ) config.transition = 'linear';
-
-		dom.wrapper.classList.add( config.transition );
-
-		dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
-		dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
-
-		dom.controls.style.display = config.controls ? 'block' : 'none';
-		dom.progress.style.display = config.progress ? 'block' : 'none';
-
-		if( config.rtl ) {
-			dom.wrapper.classList.add( 'rtl' );
-		}
-		else {
-			dom.wrapper.classList.remove( 'rtl' );
-		}
-
-		if( config.center ) {
-			dom.wrapper.classList.add( 'center' );
-		}
-		else {
-			dom.wrapper.classList.remove( 'center' );
-		}
-
-		// Exit the paused mode if it was configured off
-		if( config.pause === false ) {
-			resume();
-		}
-
-		if( config.showNotes ) {
-			dom.speakerNotes.classList.add( 'visible' );
-		}
-		else {
-			dom.speakerNotes.classList.remove( 'visible' );
-		}
-
-		if( config.mouseWheel ) {
-			document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
-			document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
-		}
-		else {
-			document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
-			document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
-		}
-
-		// Rolling 3D links
-		if( config.rollingLinks ) {
-			enableRollingLinks();
-		}
-		else {
-			disableRollingLinks();
-		}
-
-		// Iframe link previews
-		if( config.previewLinks ) {
-			enablePreviewLinks();
-		}
-		else {
-			disablePreviewLinks();
-			enablePreviewLinks( '[data-preview-link]' );
-		}
-
-		// Remove existing auto-slide controls
-		if( autoSlidePlayer ) {
-			autoSlidePlayer.destroy();
-			autoSlidePlayer = null;
-		}
-
-		// Generate auto-slide controls if needed
-		if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
-			autoSlidePlayer = new Playback( dom.wrapper, function() {
-				return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
-			} );
-
-			autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
-			autoSlidePaused = false;
-		}
-
-		// When fragments are turned off they should be visible
-		if( config.fragments === false ) {
-			toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
-				element.classList.add( 'visible' );
-				element.classList.remove( 'current-fragment' );
-			} );
-		}
-
-		sync();
-
-	}
-
-	/**
-	 * Binds all event listeners.
-	 */
-	function addEventListeners() {
-
-		eventsAreBound = true;
-
-		window.addEventListener( 'hashchange', onWindowHashChange, false );
-		window.addEventListener( 'resize', onWindowResize, false );
-
-		if( config.touch ) {
-			dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
-			dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
-			dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
-
-			// Support pointer-style touch interaction as well
-			if( window.navigator.pointerEnabled ) {
-				// IE 11 uses un-prefixed version of pointer events
-				dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
-				dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
-				dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
-			}
-			else if( window.navigator.msPointerEnabled ) {
-				// IE 10 uses prefixed version of pointer events
-				dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
-				dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
-				dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
-			}
-		}
-
-		if( config.keyboard ) {
-			document.addEventListener( 'keydown', onDocumentKeyDown, false );
-			document.addEventListener( 'keypress', onDocumentKeyPress, false );
-		}
-
-		if( config.progress && dom.progress ) {
-			dom.progress.addEventListener( 'click', onProgressClicked, false );
-		}
-
-		if( config.focusBodyOnPageVisibilityChange ) {
-			var visibilityChange;
-
-			if( 'hidden' in document ) {
-				visibilityChange = 'visibilitychange';
-			}
-			else if( 'msHidden' in document ) {
-				visibilityChange = 'msvisibilitychange';
-			}
-			else if( 'webkitHidden' in document ) {
-				visibilityChange = 'webkitvisibilitychange';
-			}
-
-			if( visibilityChange ) {
-				document.addEventListener( visibilityChange, onPageVisibilityChange, false );
-			}
-		}
-
-		// Listen to both touch and click events, in case the device
-		// supports both
-		var pointerEvents = [ 'touchstart', 'click' ];
-
-		// Only support touch for Android, fixes double navigations in
-		// stock browser
-		if( navigator.userAgent.match( /android/gi ) ) {
-			pointerEvents = [ 'touchstart' ];
-		}
-
-		pointerEvents.forEach( function( eventName ) {
-			dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
-			dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
-			dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
-			dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
-			dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
-			dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
-		} );
-
-	}
-
-	/**
-	 * Unbinds all event listeners.
-	 */
-	function removeEventListeners() {
-
-		eventsAreBound = false;
-
-		document.removeEventListener( 'keydown', onDocumentKeyDown, false );
-		document.removeEventListener( 'keypress', onDocumentKeyPress, false );
-		window.removeEventListener( 'hashchange', onWindowHashChange, false );
-		window.removeEventListener( 'resize', onWindowResize, false );
-
-		dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
-		dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
-		dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
-
-		// IE11
-		if( window.navigator.pointerEnabled ) {
-			dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
-			dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
-			dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
-		}
-		// IE10
-		else if( window.navigator.msPointerEnabled ) {
-			dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
-			dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
-			dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
-		}
-
-		if ( config.progress && dom.progress ) {
-			dom.progress.removeEventListener( 'click', onProgressClicked, false );
-		}
-
-		[ 'touchstart', 'click' ].forEach( function( eventName ) {
-			dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
-			dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
-			dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
-			dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
-			dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
-			dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
-		} );
-
-	}
-
-	/**
-	 * Extend object a with the properties of object b.
-	 * If there's a conflict, object b takes precedence.
-	 */
-	function extend( a, b ) {
-
-		for( var i in b ) {
-			a[ i ] = b[ i ];
-		}
-
-	}
-
-	/**
-	 * Converts the target object to an array.
-	 */
-	function toArray( o ) {
-
-		return Array.prototype.slice.call( o );
-
-	}
-
-	/**
-	 * Utility for deserializing a value.
-	 */
-	function deserialize( value ) {
-
-		if( typeof value === 'string' ) {
-			if( value === 'null' ) return null;
-			else if( value === 'true' ) return true;
-			else if( value === 'false' ) return false;
-			else if( value.match( /^\d+$/ ) ) return parseFloat( value );
-		}
-
-		return value;
-
-	}
-
-	/**
-	 * Measures the distance in pixels between point a
-	 * and point b.
-	 *
-	 * @param {Object} a point with x/y properties
-	 * @param {Object} b point with x/y properties
-	 */
-	function distanceBetween( a, b ) {
-
-		var dx = a.x - b.x,
-			dy = a.y - b.y;
-
-		return Math.sqrt( dx*dx + dy*dy );
-
-	}
-
-	/**
-	 * Applies a CSS transform to the target element.
-	 */
-	function transformElement( element, transform ) {
-
-		element.style.WebkitTransform = transform;
-		element.style.MozTransform = transform;
-		element.style.msTransform = transform;
-		element.style.transform = transform;
-
-	}
-
-	/**
-	 * Applies CSS transforms to the slides container. The container
-	 * is transformed from two separate sources: layout and the overview
-	 * mode.
-	 */
-	function transformSlides( transforms ) {
-
-		// Pick up new transforms from arguments
-		if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
-		if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
-
-		// Apply the transforms to the slides container
-		if( slidesTransform.layout ) {
-			transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
-		}
-		else {
-			transformElement( dom.slides, slidesTransform.overview );
-		}
-
-	}
-
-	/**
-	 * Injects the given CSS styles into the DOM.
-	 */
-	function injectStyleSheet( value ) {
-
-		var tag = document.createElement( 'style' );
-		tag.type = 'text/css';
-		if( tag.styleSheet ) {
-			tag.styleSheet.cssText = value;
-		}
-		else {
-			tag.appendChild( document.createTextNode( value ) );
-		}
-		document.getElementsByTagName( 'head' )[0].appendChild( tag );
-
-	}
-
-	/**
-	 * Converts various color input formats to an {r:0,g:0,b:0} object.
-	 *
-	 * @param {String} color The string representation of a color,
-	 * the following formats are supported:
-	 * - #000
-	 * - #000000
-	 * - rgb(0,0,0)
-	 */
-	function colorToRgb( color ) {
-
-		var hex3 = color.match( /^#([0-9a-f]{3})$/i );
-		if( hex3 && hex3[1] ) {
-			hex3 = hex3[1];
-			return {
-				r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
-				g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
-				b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
-			};
-		}
-
-		var hex6 = color.match( /^#([0-9a-f]{6})$/i );
-		if( hex6 && hex6[1] ) {
-			hex6 = hex6[1];
-			return {
-				r: parseInt( hex6.substr( 0, 2 ), 16 ),
-				g: parseInt( hex6.substr( 2, 2 ), 16 ),
-				b: parseInt( hex6.substr( 4, 2 ), 16 )
-			};
-		}
-
-		var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
-		if( rgb ) {
-			return {
-				r: parseInt( rgb[1], 10 ),
-				g: parseInt( rgb[2], 10 ),
-				b: parseInt( rgb[3], 10 )
-			};
-		}
-
-		var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
-		if( rgba ) {
-			return {
-				r: parseInt( rgba[1], 10 ),
-				g: parseInt( rgba[2], 10 ),
-				b: parseInt( rgba[3], 10 ),
-				a: parseFloat( rgba[4] )
-			};
-		}
-
-		return null;
-
-	}
-
-	/**
-	 * Calculates brightness on a scale of 0-255.
-	 *
-	 * @param color See colorStringToRgb for supported formats.
-	 */
-	function colorBrightness( color ) {
-
-		if( typeof color === 'string' ) color = colorToRgb( color );
-
-		if( color ) {
-			return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
-		}
-
-		return null;
-
-	}
-
-	/**
-	 * Retrieves the height of the given element by looking
-	 * at the position and height of its immediate children.
-	 */
-	function getAbsoluteHeight( element ) {
-
-		var height = 0;
-
-		if( element ) {
-			var absoluteChildren = 0;
-
-			toArray( element.childNodes ).forEach( function( child ) {
-
-				if( typeof child.offsetTop === 'number' && child.style ) {
-					// Count # of abs children
-					if( window.getComputedStyle( child ).position === 'absolute' ) {
-						absoluteChildren += 1;
-					}
-
-					height = Math.max( height, child.offsetTop + child.offsetHeight );
-				}
-
-			} );
-
-			// If there are no absolute children, use offsetHeight
-			if( absoluteChildren === 0 ) {
-				height = element.offsetHeight;
-			}
-
-		}
-
-		return height;
-
-	}
-
-	/**
-	 * Returns the remaining height within the parent of the
-	 * target element.
-	 *
-	 * remaining height = [ configured parent height ] - [ current parent height ]
-	 */
-	function getRemainingHeight( element, height ) {
-
-		height = height || 0;
-
-		if( element ) {
-			var newHeight, oldHeight = element.style.height;
-
-			// Change the .stretch element height to 0 in order find the height of all
-			// the other elements
-			element.style.height = '0px';
-			newHeight = height - element.parentNode.offsetHeight;
-
-			// Restore the old height, just in case
-			element.style.height = oldHeight + 'px';
-
-			return newHeight;
-		}
-
-		return height;
-
-	}
-
-	/**
-	 * Checks if this instance is being used to print a PDF.
-	 */
-	function isPrintingPDF() {
-
-		return ( /print-pdf/gi ).test( window.location.search );
-
-	}
-
-	/**
-	 * Hides the address bar if we're on a mobile device.
-	 */
-	function hideAddressBar() {
-
-		if( config.hideAddressBar && isMobileDevice ) {
-			// Events that should trigger the address bar to hide
-			window.addEventListener( 'load', removeAddressBar, false );
-			window.addEventListener( 'orientationchange', removeAddressBar, false );
-		}
-
-	}
-
-	/**
-	 * Causes the address bar to hide on mobile devices,
-	 * more vertical space ftw.
-	 */
-	function removeAddressBar() {
-
-		setTimeout( function() {
-			window.scrollTo( 0, 1 );
-		}, 10 );
-
-	}
-
-	/**
-	 * Dispatches an event of the specified type from the
-	 * reveal DOM element.
-	 */
-	function dispatchEvent( type, args ) {
-
-		var event = document.createEvent( 'HTMLEvents', 1, 2 );
-		event.initEvent( type, true, true );
-		extend( event, args );
-		dom.wrapper.dispatchEvent( event );
-
-		// If we're in an iframe, post each reveal.js event to the
-		// parent window. Used by the notes plugin
-		if( config.postMessageEvents && window.parent !== window.self ) {
-			window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
-		}
-
-	}
-
-	/**
-	 * Wrap all links in 3D goodness.
-	 */
-	function enableRollingLinks() {
-
-		if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
-			var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
-
-			for( var i = 0, len = anchors.length; i < len; i++ ) {
-				var anchor = anchors[i];
-
-				if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
-					var span = document.createElement('span');
-					span.setAttribute('data-title', anchor.text);
-					span.innerHTML = anchor.innerHTML;
-
-					anchor.classList.add( 'roll' );
-					anchor.innerHTML = '';
-					anchor.appendChild(span);
-				}
-			}
-		}
-
-	}
-
-	/**
-	 * Unwrap all 3D links.
-	 */
-	function disableRollingLinks() {
-
-		var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
-
-		for( var i = 0, len = anchors.length; i < len; i++ ) {
-			var anchor = anchors[i];
-			var span = anchor.querySelector( 'span' );
-
-			if( span ) {
-				anchor.classList.remove( 'roll' );
-				anchor.innerHTML = span.innerHTML;
-			}
-		}
-
-	}
-
-	/**
-	 * Bind preview frame links.
-	 */
-	function enablePreviewLinks( selector ) {
-
-		var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
-
-		anchors.forEach( function( element ) {
-			if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
-				element.addEventListener( 'click', onPreviewLinkClicked, false );
-			}
-		} );
-
-	}
-
-	/**
-	 * Unbind preview frame links.
-	 */
-	function disablePreviewLinks() {
-
-		var anchors = toArray( document.querySelectorAll( 'a' ) );
-
-		anchors.forEach( function( element ) {
-			if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
-				element.removeEventListener( 'click', onPreviewLinkClicked, false );
-			}
-		} );
-
-	}
-
-	/**
-	 * Opens a preview window for the target URL.
-	 */
-	function showPreview( url ) {
-
-		closeOverlay();
-
-		dom.overlay = document.createElement( 'div' );
-		dom.overlay.classList.add( 'overlay' );
-		dom.overlay.classList.add( 'overlay-preview' );
-		dom.wrapper.appendChild( dom.overlay );
-
-		dom.overlay.innerHTML = [
-			'<header>',
-				'<a class="close" href="#"><span class="icon"></span></a>',
-				'<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
-			'</header>',
-			'<div class="spinner"></div>',
-			'<div class="viewport">',
-				'<iframe src="'+ url +'"></iframe>',
-			'</div>'
-		].join('');
-
-		dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
-			dom.overlay.classList.add( 'loaded' );
-		}, false );
-
-		dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
-			closeOverlay();
-			event.preventDefault();
-		}, false );
-
-		dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
-			closeOverlay();
-		}, false );
-
-		setTimeout( function() {
-			dom.overlay.classList.add( 'visible' );
-		}, 1 );
-
-	}
-
-	/**
-	 * Opens a overlay window with help material.
-	 */
-	function showHelp() {
-
-		if( config.help ) {
-
-			closeOverlay();
-
-			dom.overlay = document.createElement( 'div' );
-			dom.overlay.classList.add( 'overlay' );
-			dom.overlay.classList.add( 'overlay-help' );
-			dom.wrapper.appendChild( dom.overlay );
-
-			var html = '<p class="title">Keyboard Shortcuts</p><br/>';
-
-			html += '<table><th>KEY</th><th>ACTION</th>';
-			for( var key in keyboardShortcuts ) {
-				html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
-			}
-
-			html += '</table>';
-
-			dom.overlay.innerHTML = [
-				'<header>',
-					'<a class="close" href="#"><span class="icon"></span></a>',
-				'</header>',
-				'<div class="viewport">',
-					'<div class="viewport-inner">'+ html +'</div>',
-				'</div>'
-			].join('');
-
-			dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
-				closeOverlay();
-				event.preventDefault();
-			}, false );
-
-			setTimeout( function() {
-				dom.overlay.classList.add( 'visible' );
-			}, 1 );
-
-		}
-
-	}
-
-	/**
-	 * Closes any currently open overlay.
-	 */
-	function closeOverlay() {
-
-		if( dom.overlay ) {
-			dom.overlay.parentNode.removeChild( dom.overlay );
-			dom.overlay = null;
-		}
-
-	}
-
-	/**
-	 * Applies JavaScript-controlled layout rules to the
-	 * presentation.
-	 */
-	function layout() {
-
-		if( dom.wrapper && !isPrintingPDF() ) {
-
-			var size = getComputedSlideSize();
-
-			var slidePadding = 20; // TODO Dig this out of DOM
-
-			// Layout the contents of the slides
-			layoutSlideContents( config.width, config.height, slidePadding );
-
-			dom.slides.style.width = size.width + 'px';
-			dom.slides.style.height = size.height + 'px';
-
-			// Determine scale of content to fit within available space
-			scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
-
-			// Respect max/min scale settings
-			scale = Math.max( scale, config.minScale );
-			scale = Math.min( scale, config.maxScale );
-
-			// Don't apply any scaling styles if scale is 1
-			if( scale === 1 ) {
-				dom.slides.style.zoom = '';
-				dom.slides.style.left = '';
-				dom.slides.style.top = '';
-				dom.slides.style.bottom = '';
-				dom.slides.style.right = '';
-				transformSlides( { layout: '' } );
-			}
-			else {
-				// Use zoom to scale up in desktop Chrome so that content
-				// remains crisp. We don't use zoom to scale down since that
-				// can lead to shifts in text layout/line breaks.
-				if( scale > 1 && !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
-					dom.slides.style.zoom = scale;
-					dom.slides.style.left = '';
-					dom.slides.style.top = '';
-					dom.slides.style.bottom = '';
-					dom.slides.style.right = '';
-					transformSlides( { layout: '' } );
-				}
-				// Apply scale transform as a fallback
-				else {
-					dom.slides.style.zoom = '';
-					dom.slides.style.left = '50%';
-					dom.slides.style.top = '50%';
-					dom.slides.style.bottom = 'auto';
-					dom.slides.style.right = 'auto';
-					transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
-				}
-			}
-
-			// Select all slides, vertical and horizontal
-			var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
-
-			for( var i = 0, len = slides.length; i < len; i++ ) {
-				var slide = slides[ i ];
-
-				// Don't bother updating invisible slides
-				if( slide.style.display === 'none' ) {
-					continue;
-				}
-
-				if( config.center || slide.classList.contains( 'center' ) ) {
-					// Vertical stacks are not centred since their section
-					// children will be
-					if( slide.classList.contains( 'stack' ) ) {
-						slide.style.top = 0;
-					}
-					else {
-						slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
-					}
-				}
-				else {
-					slide.style.top = '';
-				}
-
-			}
-
-			updateProgress();
-			updateParallax();
-
-		}
-
-	}
-
-	/**
-	 * Applies layout logic to the contents of all slides in
-	 * the presentation.
-	 */
-	function layoutSlideContents( width, height, padding ) {
-
-		// Handle sizing of elements with the 'stretch' class
-		toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
-
-			// Determine how much vertical space we can use
-			var remainingHeight = getRemainingHeight( element, height );
-
-			// Consider the aspect ratio of media elements
-			if( /(img|video)/gi.test( element.nodeName ) ) {
-				var nw = element.naturalWidth || element.videoWidth,
-					nh = element.naturalHeight || element.videoHeight;
-
-				var es = Math.min( width / nw, remainingHeight / nh );
-
-				element.style.width = ( nw * es ) + 'px';
-				element.style.height = ( nh * es ) + 'px';
-
-			}
-			else {
-				element.style.width = width + 'px';
-				element.style.height = remainingHeight + 'px';
-			}
-
-		} );
-
-	}
-
-	/**
-	 * Calculates the computed pixel size of our slides. These
-	 * values are based on the width and height configuration
-	 * options.
-	 */
-	function getComputedSlideSize( presentationWidth, presentationHeight ) {
-
-		var size = {
-			// Slide size
-			width: config.width,
-			height: config.height,
-
-			// Presentation size
-			presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
-			presentationHeight: presentationHeight || dom.wrapper.offsetHeight
-		};
-
-		// Reduce available space by margin
-		size.presentationWidth -= ( size.presentationWidth * config.margin );
-		size.presentationHeight -= ( size.presentationHeight * config.margin );
-
-		// Slide width may be a percentage of available width
-		if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
-			size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
-		}
-
-		// Slide height may be a percentage of available height
-		if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
-			size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
-		}
-
-		return size;
-
-	}
-
-	/**
-	 * Stores the vertical index of a stack so that the same
-	 * vertical slide can be selected when navigating to and
-	 * from the stack.
-	 *
-	 * @param {HTMLElement} stack The vertical stack element
-	 * @param {int} v Index to memorize
-	 */
-	function setPreviousVerticalIndex( stack, v ) {
-
-		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
-			stack.setAttribute( 'data-previous-indexv', v || 0 );
-		}
-
-	}
-
-	/**
-	 * Retrieves the vertical index which was stored using
-	 * #setPreviousVerticalIndex() or 0 if no previous index
-	 * exists.
-	 *
-	 * @param {HTMLElement} stack The vertical stack element
-	 */
-	function getPreviousVerticalIndex( stack ) {
-
-		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
-			// Prefer manually defined start-indexv
-			var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
-
-			return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
-		}
-
-		return 0;
-
-	}
-
-	/**
-	 * Displays the overview of slides (quick nav) by scaling
-	 * down and arranging all slide elements.
-	 */
-	function activateOverview() {
-
-		// Only proceed if enabled in config
-		if( config.overview && !isOverview() ) {
-
-			overview = true;
-
-			dom.wrapper.classList.add( 'overview' );
-			dom.wrapper.classList.remove( 'overview-deactivating' );
-
-			if( features.overviewTransitions ) {
-				setTimeout( function() {
-					dom.wrapper.classList.add( 'overview-animated' );
-				}, 1 );
-			}
-
-			// Don't auto-slide while in overview mode
-			cancelAutoSlide();
-
-			// Move the backgrounds element into the slide container to
-			// that the same scaling is applied
-			dom.slides.appendChild( dom.background );
-
-			// Clicking on an overview slide navigates to it
-			toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
-				if( !slide.classList.contains( 'stack' ) ) {
-					slide.addEventListener( 'click', onOverviewSlideClicked, true );
-				}
-			} );
-
-			updateSlidesVisibility();
-			layoutOverview();
-			updateOverview();
-
-			layout();
-
-			// Notify observers of the overview showing
-			dispatchEvent( 'overviewshown', {
-				'indexh': indexh,
-				'indexv': indexv,
-				'currentSlide': currentSlide
-			} );
-
-		}
-
-	}
-
-	/**
-	 * Uses CSS transforms to position all slides in a grid for
-	 * display inside of the overview mode.
-	 */
-	function layoutOverview() {
-
-		var margin = 70;
-		var slideWidth = config.width + margin,
-			slideHeight = config.height + margin;
-
-		// Reverse in RTL mode
-		if( config.rtl ) {
-			slideWidth = -slideWidth;
-		}
-
-		// Layout slides
-		toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
-			hslide.setAttribute( 'data-index-h', h );
-			transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
-
-			if( hslide.classList.contains( 'stack' ) ) {
-
-				toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
-					vslide.setAttribute( 'data-index-h', h );
-					vslide.setAttribute( 'data-index-v', v );
-
-					transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
-				} );
-
-			}
-		} );
-
-		// Layout slide backgrounds
-		toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
-			transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
-
-			toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
-				transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
-			} );
-		} );
-
-	}
-
-	/**
-	 * Moves the overview viewport to the current slides.
-	 * Called each time the current slide changes.
-	 */
-	function updateOverview() {
-
-		var margin = 70;
-		var slideWidth = config.width + margin,
-			slideHeight = config.height + margin;
-
-		// Reverse in RTL mode
-		if( config.rtl ) {
-			slideWidth = -slideWidth;
-		}
-
-		transformSlides( {
-			overview: [
-				'translateX('+ ( -indexh * slideWidth ) +'px)',
-				'translateY('+ ( -indexv * slideHeight ) +'px)',
-				'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
-			].join( ' ' )
-		} );
-
-	}
-
-	/**
-	 * Exits the slide overview and enters the currently
-	 * active slide.
-	 */
-	function deactivateOverview() {
-
-		// Only proceed if enabled in config
-		if( config.overview ) {
-
-			overview = false;
-
-			dom.wrapper.classList.remove( 'overview' );
-			dom.wrapper.classList.remove( 'overview-animated' );
-
-			// Temporarily add a class so that transitions can do different things
-			// depending on whether they are exiting/entering overview, or just
-			// moving from slide to slide
-			dom.wrapper.classList.add( 'overview-deactivating' );
-
-			setTimeout( function () {
-				dom.wrapper.classList.remove( 'overview-deactivating' );
-			}, 1 );
-
-			// Move the background element back out
-			dom.wrapper.appendChild( dom.background );
-
-			// Clean up changes made to slides
-			toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
-				transformElement( slide, '' );
-
-				slide.removeEventListener( 'click', onOverviewSlideClicked, true );
-			} );
-
-			// Clean up changes made to backgrounds
-			toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
-				transformElement( background, '' );
-			} );
-
-			transformSlides( { overview: '' } );
-
-			slide( indexh, indexv );
-
-			layout();
-
-			cueAutoSlide();
-
-			// Notify observers of the overview hiding
-			dispatchEvent( 'overviewhidden', {
-				'indexh': indexh,
-				'indexv': indexv,
-				'currentSlide': currentSlide
-			} );
-
-		}
-	}
-
-	/**
-	 * Toggles the slide overview mode on and off.
-	 *
-	 * @param {Boolean} override Optional flag which overrides the
-	 * toggle logic and forcibly sets the desired state. True means
-	 * overview is open, false means it's closed.
-	 */
-	function toggleOverview( override ) {
-
-		if( typeof override === 'boolean' ) {
-			override ? activateOverview() : deactivateOverview();
-		}
-		else {
-			isOverview() ? deactivateOverview() : activateOverview();
-		}
-
-	}
-
-	/**
-	 * Checks if the overview is currently active.
-	 *
-	 * @return {Boolean} true if the overview is active,
-	 * false otherwise
-	 */
-	function isOverview() {
-
-		return overview;
-
-	}
-
-	/**
-	 * Checks if the current or specified slide is vertical
-	 * (nested within another slide).
-	 *
-	 * @param {HTMLElement} slide [optional] The slide to check
-	 * orientation of
-	 */
-	function isVerticalSlide( slide ) {
-
-		// Prefer slide argument, otherwise use current slide
-		slide = slide ? slide : currentSlide;
-
-		return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
-
-	}
-
-	/**
-	 * Handling the fullscreen functionality via the fullscreen API
-	 *
-	 * @see http://fullscreen.spec.whatwg.org/
-	 * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
-	 */
-	function enterFullscreen() {
-
-		var element = document.body;
-
-		// Check which implementation is available
-		var requestMethod = element.requestFullScreen ||
-							element.webkitRequestFullscreen ||
-							element.webkitRequestFullScreen ||
-							element.mozRequestFullScreen ||
-							element.msRequestFullscreen;
-
-		if( requestMethod ) {
-			requestMethod.apply( element );
-		}
-
-	}
-
-	/**
-	 * Enters the paused mode which fades everything on screen to
-	 * black.
-	 */
-	function pause() {
-
-		if( config.pause ) {
-			var wasPaused = dom.wrapper.classList.contains( 'paused' );
-
-			cancelAutoSlide();
-			dom.wrapper.classList.add( 'paused' );
-
-			if( wasPaused === false ) {
-				dispatchEvent( 'paused' );
-			}
-		}
-
-	}
-
-	/**
-	 * Exits from the paused mode.
-	 */
-	function resume() {
-
-		var wasPaused = dom.wrapper.classList.contains( 'paused' );
-		dom.wrapper.classList.remove( 'paused' );
-
-		cueAutoSlide();
-
-		if( wasPaused ) {
-			dispatchEvent( 'resumed' );
-		}
-
-	}
-
-	/**
-	 * Toggles the paused mode on and off.
-	 */
-	function togglePause( override ) {
-
-		if( typeof override === 'boolean' ) {
-			override ? pause() : resume();
-		}
-		else {
-			isPaused() ? resume() : pause();
-		}
-
-	}
-
-	/**
-	 * Checks if we are currently in the paused mode.
-	 */
-	function isPaused() {
-
-		return dom.wrapper.classList.contains( 'paused' );
-
-	}
-
-	/**
-	 * Toggles the auto slide mode on and off.
-	 *
-	 * @param {Boolean} override Optional flag which sets the desired state.
-	 * True means autoplay starts, false means it stops.
-	 */
-
-	function toggleAutoSlide( override ) {
-
-		if( typeof override === 'boolean' ) {
-			override ? resumeAutoSlide() : pauseAutoSlide();
-		}
-
-		else {
-			autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
-		}
-
-	}
-
-	/**
-	 * Checks if the auto slide mode is currently on.
-	 */
-	function isAutoSliding() {
-
-		return !!( autoSlide && !autoSlidePaused );
-
-	}
-
-	/**
-	 * Steps from the current point in the presentation to the
-	 * slide which matches the specified horizontal and vertical
-	 * indices.
-	 *
-	 * @param {int} h Horizontal index of the target slide
-	 * @param {int} v Vertical index of the target slide
-	 * @param {int} f Optional index of a fragment within the
-	 * target slide to activate
-	 * @param {int} o Optional origin for use in multimaster environments
-	 */
-	function slide( h, v, f, o ) {
-
-		// Remember where we were at before
-		previousSlide = currentSlide;
-
-		// Query all horizontal slides in the deck
-		var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
-
-		// If no vertical index is specified and the upcoming slide is a
-		// stack, resume at its previous vertical index
-		if( v === undefined && !isOverview() ) {
-			v = getPreviousVerticalIndex( horizontalSlides[ h ] );
-		}
-
-		// If we were on a vertical stack, remember what vertical index
-		// it was on so we can resume at the same position when returning
-		if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
-			setPreviousVerticalIndex( previousSlide.parentNode, indexv );
-		}
-
-		// Remember the state before this slide
-		var stateBefore = state.concat();
-
-		// Reset the state array
-		state.length = 0;
-
-		var indexhBefore = indexh || 0,
-			indexvBefore = indexv || 0;
-
-		// Activate and transition to the new slide
-		indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
-		indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
-
-		// Update the visibility of slides now that the indices have changed
-		updateSlidesVisibility();
-
-		layout();
-
-		// Apply the new state
-		stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
-			// Check if this state existed on the previous slide. If it
-			// did, we will avoid adding it repeatedly
-			for( var j = 0; j < stateBefore.length; j++ ) {
-				if( stateBefore[j] === state[i] ) {
-					stateBefore.splice( j, 1 );
-					continue stateLoop;
-				}
-			}
-
-			document.documentElement.classList.add( state[i] );
-
-			// Dispatch custom event matching the state's name
-			dispatchEvent( state[i] );
-		}
-
-		// Clean up the remains of the previous state
-		while( stateBefore.length ) {
-			document.documentElement.classList.remove( stateBefore.pop() );
-		}
-
-		// Update the overview if it's currently active
-		if( isOverview() ) {
-			updateOverview();
-		}
-
-		// Find the current horizontal slide and any possible vertical slides
-		// within it
-		var currentHorizontalSlide = horizontalSlides[ indexh ],
-			currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
-
-		// Store references to the previous and current slides
-		currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
-
-		// Show fragment, if specified
-		if( typeof f !== 'undefined' ) {
-			navigateFragment( f );
-		}
-
-		// Dispatch an event if the slide changed
-		var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
-		if( slideChanged ) {
-			dispatchEvent( 'slidechanged', {
-				'indexh': indexh,
-				'indexv': indexv,
-				'previousSlide': previousSlide,
-				'currentSlide': currentSlide,
-				'origin': o
-			} );
-		}
-		else {
-			// Ensure that the previous slide is never the same as the current
-			previousSlide = null;
-		}
-
-		// Solves an edge case where the previous slide maintains the
-		// 'present' class when navigating between adjacent vertical
-		// stacks
-		if( previousSlide ) {
-			previousSlide.classList.remove( 'present' );
-			previousSlide.setAttribute( 'aria-hidden', 'true' );
-
-			// Reset all slides upon navigate to home
-			// Issue: #285
-			if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
-				// Launch async task
-				setTimeout( function () {
-					var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
-					for( i in slides ) {
-						if( slides[i] ) {
-							// Reset stack
-							setPreviousVerticalIndex( slides[i], 0 );
-						}
-					}
-				}, 0 );
-			}
-		}
-
-		// Handle embedded content
-		if( slideChanged || !previousSlide ) {
-			stopEmbeddedContent( previousSlide );
-			startEmbeddedContent( currentSlide );
-		}
-
-		// Announce the current slide contents, for screen readers
-		dom.statusDiv.textContent = currentSlide.textContent;
-
-		updateControls();
-		updateProgress();
-		updateBackground();
-		updateParallax();
-		updateSlideNumber();
-		updateNotes();
-
-		// Update the URL hash
-		writeURL();
-
-		cueAutoSlide();
-
-	}
-
-	/**
-	 * Syncs the presentation with the current DOM. Useful
-	 * when new slides or control elements are added or when
-	 * the configuration has changed.
-	 */
-	function sync() {
-
-		// Subscribe to input
-		removeEventListeners();
-		addEventListeners();
-
-		// Force a layout to make sure the current config is accounted for
-		layout();
-
-		// Reflect the current autoSlide value
-		autoSlide = config.autoSlide;
-
-		// Start auto-sliding if it's enabled
-		cueAutoSlide();
-
-		// Re-create the slide backgrounds
-		createBackgrounds();
-
-		// Write the current hash to the URL
-		writeURL();
-
-		sortAllFragments();
-
-		updateControls();
-		updateProgress();
-		updateBackground( true );
-		updateSlideNumber();
-		updateSlidesVisibility();
-		updateNotes();
-
-		formatEmbeddedContent();
-		startEmbeddedContent( currentSlide );
-
-		if( isOverview() ) {
-			layoutOverview();
-		}
-
-	}
-
-	/**
-	 * Resets all vertical slides so that only the first
-	 * is visible.
-	 */
-	function resetVerticalSlides() {
-
-		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
-		horizontalSlides.forEach( function( horizontalSlide ) {
-
-			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
-			verticalSlides.forEach( function( verticalSlide, y ) {
-
-				if( y > 0 ) {
-					verticalSlide.classList.remove( 'present' );
-					verticalSlide.classList.remove( 'past' );
-					verticalSlide.classList.add( 'future' );
-					verticalSlide.setAttribute( 'aria-hidden', 'true' );
-				}
-
-			} );
-
-		} );
-
-	}
-
-	/**
-	 * Sorts and formats all of fragments in the
-	 * presentation.
-	 */
-	function sortAllFragments() {
-
-		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
-		horizontalSlides.forEach( function( horizontalSlide ) {
-
-			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
-			verticalSlides.forEach( function( verticalSlide, y ) {
-
-				sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
-
-			} );
-
-			if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
-
-		} );
-
-	}
-
-	/**
-	 * Updates one dimension of slides by showing the slide
-	 * with the specified index.
-	 *
-	 * @param {String} selector A CSS selector that will fetch
-	 * the group of slides we are working with
-	 * @param {Number} index The index of the slide that should be
-	 * shown
-	 *
-	 * @return {Number} The index of the slide that is now shown,
-	 * might differ from the passed in index if it was out of
-	 * bounds.
-	 */
-	function updateSlides( selector, index ) {
-
-		// Select all slides and convert the NodeList result to
-		// an array
-		var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
-			slidesLength = slides.length;
-
-		var printMode = isPrintingPDF();
-
-		if( slidesLength ) {
-
-			// Should the index loop?
-			if( config.loop ) {
-				index %= slidesLength;
-
-				if( index < 0 ) {
-					index = slidesLength + index;
-				}
-			}
-
-			// Enforce max and minimum index bounds
-			index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
-
-			for( var i = 0; i < slidesLength; i++ ) {
-				var element = slides[i];
-
-				var reverse = config.rtl && !isVerticalSlide( element );
-
-				element.classList.remove( 'past' );
-				element.classList.remove( 'present' );
-				element.classList.remove( 'future' );
-
-				// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
-				element.setAttribute( 'hidden', '' );
-				element.setAttribute( 'aria-hidden', 'true' );
-
-				// If this element contains vertical slides
-				if( element.querySelector( 'section' ) ) {
-					element.classList.add( 'stack' );
-				}
-
-				// If we're printing static slides, all slides are "present"
-				if( printMode ) {
-					element.classList.add( 'present' );
-					continue;
-				}
-
-				if( i < index ) {
-					// Any element previous to index is given the 'past' class
-					element.classList.add( reverse ? 'future' : 'past' );
-
-					if( config.fragments ) {
-						var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
-
-						// Show all fragments on prior slides
-						while( pastFragments.length ) {
-							var pastFragment = pastFragments.pop();
-							pastFragment.classList.add( 'visible' );
-							pastFragment.classList.remove( 'current-fragment' );
-						}
-					}
-				}
-				else if( i > index ) {
-					// Any element subsequent to index is given the 'future' class
-					element.classList.add( reverse ? 'past' : 'future' );
-
-					if( config.fragments ) {
-						var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
-
-						// No fragments in future slides should be visible ahead of time
-						while( futureFragments.length ) {
-							var futureFragment = futureFragments.pop();
-							futureFragment.classList.remove( 'visible' );
-							futureFragment.classList.remove( 'current-fragment' );
-						}
-					}
-				}
-			}
-
-			// Mark the current slide as present
-			slides[index].classList.add( 'present' );
-			slides[index].removeAttribute( 'hidden' );
-			slides[index].removeAttribute( 'aria-hidden' );
-
-			// If this slide has a state associated with it, add it
-			// onto the current state of the deck
-			var slideState = slides[index].getAttribute( 'data-state' );
-			if( slideState ) {
-				state = state.concat( slideState.split( ' ' ) );
-			}
-
-		}
-		else {
-			// Since there are no slides we can't be anywhere beyond the
-			// zeroth index
-			index = 0;
-		}
-
-		return index;
-
-	}
-
-	/**
-	 * Optimization method; hide all slides that are far away
-	 * from the present slide.
-	 */
-	function updateSlidesVisibility() {
-
-		// Select all slides and convert the NodeList result to
-		// an array
-		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
-			horizontalSlidesLength = horizontalSlides.length,
-			distanceX,
-			distanceY;
-
-		if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
-
-			// The number of steps away from the present slide that will
-			// be visible
-			var viewDistance = isOverview() ? 10 : config.viewDistance;
-
-			// Limit view distance on weaker devices
-			if( isMobileDevice ) {
-				viewDistance = isOverview() ? 6 : 2;
-			}
-
-			// All slides need to be visible when exporting to PDF
-			if( isPrintingPDF() ) {
-				viewDistance = Number.MAX_VALUE;
-			}
-
-			for( var x = 0; x < horizontalSlidesLength; x++ ) {
-				var horizontalSlide = horizontalSlides[x];
-
-				var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
-					verticalSlidesLength = verticalSlides.length;
-
-				// Determine how far away this slide is from the present
-				distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
-
-				// If the presentation is looped, distance should measure
-				// 1 between the first and last slides
-				if( config.loop ) {
-					distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
-				}
-
-				// Show the horizontal slide if it's within the view distance
-				if( distanceX < viewDistance ) {
-					showSlide( horizontalSlide );
-				}
-				else {
-					hideSlide( horizontalSlide );
-				}
-
-				if( verticalSlidesLength ) {
-
-					var oy = getPreviousVerticalIndex( horizontalSlide );
-
-					for( var y = 0; y < verticalSlidesLength; y++ ) {
-						var verticalSlide = verticalSlides[y];
-
-						distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
-
-						if( distanceX + distanceY < viewDistance ) {
-							showSlide( verticalSlide );
-						}
-						else {
-							hideSlide( verticalSlide );
-						}
-					}
-
-				}
-			}
-
-		}
-
-	}
-
-	/**
-	 * Pick up notes from the current slide and display tham
-	 * to the viewer.
-	 *
-	 * @see `showNotes` config value
-	 */
-	function updateNotes() {
-
-		if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
-
-			dom.speakerNotes.innerHTML = getSlideNotes() || '';
-
-		}
-
-	}
-
-	/**
-	 * Updates the progress bar to reflect the current slide.
-	 */
-	function updateProgress() {
-
-		// Update progress if enabled
-		if( config.progress && dom.progressbar ) {
-
-			dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
-
-		}
-
-	}
-
-	/**
-	 * Updates the slide number div to reflect the current slide.
-	 *
-	 * Slide number format can be defined as a string using the
-	 * following variables:
-	 *  h: current slide's horizontal index
-	 *  v: current slide's vertical index
-	 *  c: current slide index (flattened)
-	 *  t: total number of slides (flattened)
-	 */
-	function updateSlideNumber() {
-
-		// Update slide number if enabled
-		if( config.slideNumber && dom.slideNumber) {
-
-			// Default to only showing the current slide number
-			var format = 'c';
-
-			// Check if a custom slide number format is available
-			if( typeof config.slideNumber === 'string' ) {
-				format = config.slideNumber;
-			}
-
-			dom.slideNumber.innerHTML = format.replace( /h/g, indexh )
-												.replace( /v/g, indexv )
-												.replace( /c/g, getSlidePastCount() + 1 )
-												.replace( /t/g, getTotalSlides() );
-		}
-
-	}
-
-	/**
-	 * Updates the state of all control/navigation arrows.
-	 */
-	function updateControls() {
-
-		var routes = availableRoutes();
-		var fragments = availableFragments();
-
-		// Remove the 'enabled' class from all directions
-		dom.controlsLeft.concat( dom.controlsRight )
-						.concat( dom.controlsUp )
-						.concat( dom.controlsDown )
-						.concat( dom.controlsPrev )
-						.concat( dom.controlsNext ).forEach( function( node ) {
-			node.classList.remove( 'enabled' );
-			node.classList.remove( 'fragmented' );
-		} );
-
-		// Add the 'enabled' class to the available routes
-		if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' );	} );
-		if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-		if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' );	} );
-		if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-
-		// Prev/next buttons
-		if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-		if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-
-		// Highlight fragment directions
-		if( currentSlide ) {
-
-			// Always apply fragment decorator to prev/next buttons
-			if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-			if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-
-			// Apply fragment decorators to directional buttons based on
-			// what slide axis they are in
-			if( isVerticalSlide( currentSlide ) ) {
-				if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-				if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-			}
-			else {
-				if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-				if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-			}
-
-		}
-
-	}
-
-	/**
-	 * Updates the background elements to reflect the current
-	 * slide.
-	 *
-	 * @param {Boolean} includeAll If true, the backgrounds of
-	 * all vertical slides (not just the present) will be updated.
-	 */
-	function updateBackground( includeAll ) {
-
-		var currentBackground = null;
-
-		// Reverse past/future classes when in RTL mode
-		var horizontalPast = config.rtl ? 'future' : 'past',
-			horizontalFuture = config.rtl ? 'past' : 'future';
-
-		// Update the classes of all backgrounds to match the
-		// states of their slides (past/present/future)
-		toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
-
-			backgroundh.classList.remove( 'past' );
-			backgroundh.classList.remove( 'present' );
-			backgroundh.classList.remove( 'future' );
-
-			if( h < indexh ) {
-				backgroundh.classList.add( horizontalPast );
-			}
-			else if ( h > indexh ) {
-				backgroundh.classList.add( horizontalFuture );
-			}
-			else {
-				backgroundh.classList.add( 'present' );
-
-				// Store a reference to the current background element
-				currentBackground = backgroundh;
-			}
-
-			if( includeAll || h === indexh ) {
-				toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
-
-					backgroundv.classList.remove( 'past' );
-					backgroundv.classList.remove( 'present' );
-					backgroundv.classList.remove( 'future' );
-
-					if( v < indexv ) {
-						backgroundv.classList.add( 'past' );
-					}
-					else if ( v > indexv ) {
-						backgroundv.classList.add( 'future' );
-					}
-					else {
-						backgroundv.classList.add( 'present' );
-
-						// Only if this is the present horizontal and vertical slide
-						if( h === indexh ) currentBackground = backgroundv;
-					}
-
-				} );
-			}
-
-		} );
-
-		// Stop any currently playing video background
-		if( previousBackground ) {
-
-			var previousVideo = previousBackground.querySelector( 'video' );
-			if( previousVideo ) previousVideo.pause();
-
-		}
-
-		if( currentBackground ) {
-
-			// Start video playback
-			var currentVideo = currentBackground.querySelector( 'video' );
-			if( currentVideo ) {
-				if( currentVideo.currentTime > 0 ) currentVideo.currentTime = 0;
-				currentVideo.play();
-			}
-
-			var backgroundImageURL = currentBackground.style.backgroundImage || '';
-
-			// Restart GIFs (doesn't work in Firefox)
-			if( /\.gif/i.test( backgroundImageURL ) ) {
-				currentBackground.style.backgroundImage = '';
-				window.getComputedStyle( currentBackground ).opacity;
-				currentBackground.style.backgroundImage = backgroundImageURL;
-			}
-
-			// Don't transition between identical backgrounds. This
-			// prevents unwanted flicker.
-			var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
-			var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
-			if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
-				dom.background.classList.add( 'no-transition' );
-			}
-
-			previousBackground = currentBackground;
-
-		}
-
-		// If there's a background brightness flag for this slide,
-		// bubble it to the .reveal container
-		if( currentSlide ) {
-			[ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
-				if( currentSlide.classList.contains( classToBubble ) ) {
-					dom.wrapper.classList.add( classToBubble );
-				}
-				else {
-					dom.wrapper.classList.remove( classToBubble );
-				}
-			} );
-		}
-
-		// Allow the first background to apply without transition
-		setTimeout( function() {
-			dom.background.classList.remove( 'no-transition' );
-		}, 1 );
-
-	}
-
-	/**
-	 * Updates the position of the parallax background based
-	 * on the current slide index.
-	 */
-	function updateParallax() {
-
-		if( config.parallaxBackgroundImage ) {
-
-			var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
-				verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
-
-			var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
-				backgroundWidth, backgroundHeight;
-
-			if( backgroundSize.length === 1 ) {
-				backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
-			}
-			else {
-				backgroundWidth = parseInt( backgroundSize[0], 10 );
-				backgroundHeight = parseInt( backgroundSize[1], 10 );
-			}
-
-			var slideWidth = dom.background.offsetWidth,
-				horizontalSlideCount = horizontalSlides.length,
-				horizontalOffsetMultiplier,
-				horizontalOffset;
-
-			if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
-				horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
-			}
-			else {
-				horizontalOffsetMultiplier = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 );
-			}
-
-			horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
-
-			var slideHeight = dom.background.offsetHeight,
-				verticalSlideCount = verticalSlides.length,
-				verticalOffsetMultiplier,
-				verticalOffset;
-
-			if( typeof config.parallaxBackgroundVertical === 'number' ) {
-				verticalOffsetMultiplier = config.parallaxBackgroundVertical;
-			}
-			else {
-				verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
-			}
-
-			verticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indexv * 1 : 0;
-
-			dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
-
-		}
-
-	}
-
-	/**
-	 * Called when the given slide is within the configured view
-	 * distance. Shows the slide element and loads any content
-	 * that is set to load lazily (data-src).
-	 */
-	function showSlide( slide ) {
-
-		// Show the slide element
-		slide.style.display = 'block';
-
-		// Media elements with data-src attributes
-		toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
-			element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
-			element.removeAttribute( 'data-src' );
-		} );
-
-		// Media elements with <source> children
-		toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
-			var sources = 0;
-
-			toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
-				source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
-				source.removeAttribute( 'data-src' );
-				sources += 1;
-			} );
-
-			// If we rewrote sources for this video/audio element, we need
-			// to manually tell it to load from its new origin
-			if( sources > 0 ) {
-				media.load();
-			}
-		} );
-
-
-		// Show the corresponding background element
-		var indices = getIndices( slide );
-		var background = getSlideBackground( indices.h, indices.v );
-		if( background ) {
-			background.style.display = 'block';
-
-			// If the background contains media, load it
-			if( background.hasAttribute( 'data-loaded' ) === false ) {
-				background.setAttribute( 'data-loaded', 'true' );
-
-				var backgroundImage = slide.getAttribute( 'data-background-image' ),
-					backgroundVideo = slide.getAttribute( 'data-background-video' ),
-					backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
-					backgroundIframe = slide.getAttribute( 'data-background-iframe' );
-
-				// Images
-				if( backgroundImage ) {
-					background.style.backgroundImage = 'url('+ backgroundImage +')';
-				}
-				// Videos
-				else if ( backgroundVideo && !isSpeakerNotes() ) {
-					var video = document.createElement( 'video' );
-
-					if( backgroundVideoLoop ) {
-						video.setAttribute( 'loop', '' );
-					}
-
-					// Support comma separated lists of video sources
-					backgroundVideo.split( ',' ).forEach( function( source ) {
-						video.innerHTML += '<source src="'+ source +'">';
-					} );
-
-					background.appendChild( video );
-				}
-				// Iframes
-				else if( backgroundIframe ) {
-					var iframe = document.createElement( 'iframe' );
-						iframe.setAttribute( 'src', backgroundIframe );
-						iframe.style.width  = '100%';
-						iframe.style.height = '100%';
-						iframe.style.maxHeight = '100%';
-						iframe.style.maxWidth = '100%';
-
-					background.appendChild( iframe );
-				}
-			}
-		}
-
-	}
-
-	/**
-	 * Called when the given slide is moved outside of the
-	 * configured view distance.
-	 */
-	function hideSlide( slide ) {
-
-		// Hide the slide element
-		slide.style.display = 'none';
-
-		// Hide the corresponding background element
-		var indices = getIndices( slide );
-		var background = getSlideBackground( indices.h, indices.v );
-		if( background ) {
-			background.style.display = 'none';
-		}
-
-	}
-
-	/**
-	 * Determine what available routes there are for navigation.
-	 *
-	 * @return {Object} containing four booleans: left/right/up/down
-	 */
-	function availableRoutes() {
-
-		var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
-			verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
-
-		var routes = {
-			left: indexh > 0 || config.loop,
-			right: indexh < horizontalSlides.length - 1 || config.loop,
-			up: indexv > 0,
-			down: indexv < verticalSlides.length - 1
-		};
-
-		// reverse horizontal controls for rtl
-		if( config.rtl ) {
-			var left = routes.left;
-			routes.left = routes.right;
-			routes.right = left;
-		}
-
-		return routes;
-
-	}
-
-	/**
-	 * Returns an object describing the available fragment
-	 * directions.
-	 *
-	 * @return {Object} two boolean properties: prev/next
-	 */
-	function availableFragments() {
-
-		if( currentSlide && config.fragments ) {
-			var fragments = currentSlide.querySelectorAll( '.fragment' );
-			var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
-
-			return {
-				prev: fragments.length - hiddenFragments.length > 0,
-				next: !!hiddenFragments.length
-			};
-		}
-		else {
-			return { prev: false, next: false };
-		}
-
-	}
-
-	/**
-	 * Enforces origin-specific format rules for embedded media.
-	 */
-	function formatEmbeddedContent() {
-
-		var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
-			toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
-				var src = el.getAttribute( sourceAttribute );
-				if( src && src.indexOf( param ) === -1 ) {
-					el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
-				}
-			});
-		};
-
-		// YouTube frames must include "?enablejsapi=1"
-		_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
-		_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
-
-		// Vimeo frames must include "?api=1"
-		_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
-		_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
-
-	}
-
-	/**
-	 * Start playback of any embedded content inside of
-	 * the targeted slide.
-	 */
-	function startEmbeddedContent( slide ) {
-
-		if( slide && !isSpeakerNotes() ) {
-			// Restart GIFs
-			toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
-				// Setting the same unchanged source like this was confirmed
-				// to work in Chrome, FF & Safari
-				el.setAttribute( 'src', el.getAttribute( 'src' ) );
-			} );
-
-			// HTML5 media elements
-			toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
-				if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
-					el.play();
-				}
-			} );
-
-			// Normal iframes
-			toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
-				startEmbeddedIframe( { target: el } );
-			} );
-
-			// Lazy loading iframes
-			toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
-				if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
-					el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
-					el.addEventListener( 'load', startEmbeddedIframe );
-					el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
-				}
-			} );
-		}
-
-	}
-
-	/**
-	 * "Starts" the content of an embedded iframe using the
-	 * postmessage API.
-	 */
-	function startEmbeddedIframe( event ) {
-
-		var iframe = event.target;
-
-		// YouTube postMessage API
-		if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
-			iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
-		}
-		// Vimeo postMessage API
-		else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
-			iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
-		}
-		// Generic postMessage API
-		else {
-			iframe.contentWindow.postMessage( 'slide:start', '*' );
-		}
-
-	}
-
-	/**
-	 * Stop playback of any embedded content inside of
-	 * the targeted slide.
-	 */
-	function stopEmbeddedContent( slide ) {
-
-		if( slide && slide.parentNode ) {
-			// HTML5 media elements
-			toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
-				if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
-					el.pause();
-				}
-			} );
-
-			// Generic postMessage API for non-lazy loaded iframes
-			toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
-				el.contentWindow.postMessage( 'slide:stop', '*' );
-				el.removeEventListener( 'load', startEmbeddedIframe );
-			});
-
-			// YouTube postMessage API
-			toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
-				if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
-					el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
-				}
-			});
-
-			// Vimeo postMessage API
-			toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
-				if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
-					el.contentWindow.postMessage( '{"method":"pause"}', '*' );
-				}
-			});
-
-			// Lazy loading iframes
-			toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
-				// Only removing the src doesn't actually unload the frame
-				// in all browsers (Firefox) so we set it to blank first
-				el.setAttribute( 'src', 'about:blank' );
-				el.removeAttribute( 'src' );
-			} );
-		}
-
-	}
-
-	/**
-	 * Returns the number of past slides. This can be used as a global
-	 * flattened index for slides.
-	 */
-	function getSlidePastCount() {
-
-		var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
-
-		// The number of past slides
-		var pastCount = 0;
-
-		// Step through all slides and count the past ones
-		mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
-
-			var horizontalSlide = horizontalSlides[i];
-			var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
-
-			for( var j = 0; j < verticalSlides.length; j++ ) {
-
-				// Stop as soon as we arrive at the present
-				if( verticalSlides[j].classList.contains( 'present' ) ) {
-					break mainLoop;
-				}
-
-				pastCount++;
-
-			}
-
-			// Stop as soon as we arrive at the present
-			if( horizontalSlide.classList.contains( 'present' ) ) {
-				break;
-			}
-
-			// Don't count the wrapping section for vertical slides
-			if( horizontalSlide.classList.contains( 'stack' ) === false ) {
-				pastCount++;
-			}
-
-		}
-
-		return pastCount;
-
-	}
-
-	/**
-	 * Returns a value ranging from 0-1 that represents
-	 * how far into the presentation we have navigated.
-	 */
-	function getProgress() {
-
-		// The number of past and total slides
-		var totalCount = getTotalSlides();
-		var pastCount = getSlidePastCount();
-
-		if( currentSlide ) {
-
-			var allFragments = currentSlide.querySelectorAll( '.fragment' );
-
-			// If there are fragments in the current slide those should be
-			// accounted for in the progress.
-			if( allFragments.length > 0 ) {
-				var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
-
-				// This value represents how big a portion of the slide progress
-				// that is made up by its fragments (0-1)
-				var fragmentWeight = 0.9;
-
-				// Add fragment progress to the past slide count
-				pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
-			}
-
-		}
-
-		return pastCount / ( totalCount - 1 );
-
-	}
-
-	/**
-	 * Checks if this presentation is running inside of the
-	 * speaker notes window.
-	 */
-	function isSpeakerNotes() {
-
-		return !!window.location.search.match( /receiver/gi );
-
-	}
-
-	/**
-	 * Reads the current URL (hash) and navigates accordingly.
-	 */
-	function readURL() {
-
-		var hash = window.location.hash;
-
-		// Attempt to parse the hash as either an index or name
-		var bits = hash.slice( 2 ).split( '/' ),
-			name = hash.replace( /#|\//gi, '' );
-
-		// If the first bit is invalid and there is a name we can
-		// assume that this is a named link
-		if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
-			var element;
-
-			// Ensure the named link is a valid HTML ID attribute
-			if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
-				// Find the slide with the specified ID
-				element = document.getElementById( name );
-			}
-
-			if( element ) {
-				// Find the position of the named slide and navigate to it
-				var indices = Reveal.getIndices( element );
-				slide( indices.h, indices.v );
-			}
-			// If the slide doesn't exist, navigate to the current slide
-			else {
-				slide( indexh || 0, indexv || 0 );
-			}
-		}
-		else {
-			// Read the index components of the hash
-			var h = parseInt( bits[0], 10 ) || 0,
-				v = parseInt( bits[1], 10 ) || 0;
-
-			if( h !== indexh || v !== indexv ) {
-				slide( h, v );
-			}
-		}
-
-	}
-
-	/**
-	 * Updates the page URL (hash) to reflect the current
-	 * state.
-	 *
-	 * @param {Number} delay The time in ms to wait before
-	 * writing the hash
-	 */
-	function writeURL( delay ) {
-
-		if( config.history ) {
-
-			// Make sure there's never more than one timeout running
-			clearTimeout( writeURLTimeout );
-
-			// If a delay is specified, timeout this call
-			if( typeof delay === 'number' ) {
-				writeURLTimeout = setTimeout( writeURL, delay );
-			}
-			else if( currentSlide ) {
-				var url = '/';
-
-				// Attempt to create a named link based on the slide's ID
-				var id = currentSlide.getAttribute( 'id' );
-				if( id ) {
-					id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
-				}
-
-				// If the current slide has an ID, use that as a named link
-				if( typeof id === 'string' && id.length ) {
-					url = '/' + id;
-				}
-				// Otherwise use the /h/v index
-				else {
-					if( indexh > 0 || indexv > 0 ) url += indexh;
-					if( indexv > 0 ) url += '/' + indexv;
-				}
-
-				window.location.hash = url;
-			}
-		}
-
-	}
-
-	/**
-	 * Retrieves the h/v location of the current, or specified,
-	 * slide.
-	 *
-	 * @param {HTMLElement} slide If specified, the returned
-	 * index will be for this slide rather than the currently
-	 * active one
-	 *
-	 * @return {Object} { h: <int>, v: <int>, f: <int> }
-	 */
-	function getIndices( slide ) {
-
-		// By default, return the current indices
-		var h = indexh,
-			v = indexv,
-			f;
-
-		// If a slide is specified, return the indices of that slide
-		if( slide ) {
-			var isVertical = isVerticalSlide( slide );
-			var slideh = isVertical ? slide.parentNode : slide;
-
-			// Select all horizontal slides
-			var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
-
-			// Now that we know which the horizontal slide is, get its index
-			h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
-
-			// Assume we're not vertical
-			v = undefined;
-
-			// If this is a vertical slide, grab the vertical index
-			if( isVertical ) {
-				v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
-			}
-		}
-
-		if( !slide && currentSlide ) {
-			var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
-			if( hasFragments ) {
-				var currentFragment = currentSlide.querySelector( '.current-fragment' );
-				if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
-					f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
-				}
-				else {
-					f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
-				}
-			}
-		}
-
-		return { h: h, v: v, f: f };
-
-	}
-
-	/**
-	 * Retrieves the total number of slides in this presentation.
-	 */
-	function getTotalSlides() {
-
-		return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
-
-	}
-
-	/**
-	 * Returns the slide element matching the specified index.
-	 */
-	function getSlide( x, y ) {
-
-		var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
-		var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
-
-		if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
-			return verticalSlides ? verticalSlides[ y ] : undefined;
-		}
-
-		return horizontalSlide;
-
-	}
-
-	/**
-	 * Returns the background element for the given slide.
-	 * All slides, even the ones with no background properties
-	 * defined, have a background element so as long as the
-	 * index is valid an element will be returned.
-	 */
-	function getSlideBackground( x, y ) {
-
-		// When printing to PDF the slide backgrounds are nested
-		// inside of the slides
-		if( isPrintingPDF() ) {
-			var slide = getSlide( x, y );
-			if( slide ) {
-				var background = slide.querySelector( '.slide-background' );
-				if( background && background.parentNode === slide ) {
-					return background;
-				}
-			}
-
-			return undefined;
-		}
-
-		var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
-		var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
-
-		if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
-			return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
-		}
-
-		return horizontalBackground;
-
-	}
-
-	/**
-	 * Retrieves the speaker notes from a slide. Notes can be
-	 * defined in two ways:
-	 * 1. As a data-notes attribute on the slide <section>
-	 * 2. As an <aside class="notes"> inside of the slide
-	 */
-	function getSlideNotes( slide ) {
-
-		// Default to the current slide
-		slide = slide || currentSlide;
-
-		// Notes can be specified via the data-notes attribute...
-		if( slide.hasAttribute( 'data-notes' ) ) {
-			return slide.getAttribute( 'data-notes' );
-		}
-
-		// ... or using an <aside class="notes"> element
-		var notesElement = slide.querySelector( 'aside.notes' );
-		if( notesElement ) {
-			return notesElement.innerHTML;
-		}
-
-		return null;
-
-	}
-
-	/**
-	 * Retrieves the current state of the presentation as
-	 * an object. This state can then be restored at any
-	 * time.
-	 */
-	function getState() {
-
-		var indices = getIndices();
-
-		return {
-			indexh: indices.h,
-			indexv: indices.v,
-			indexf: indices.f,
-			paused: isPaused(),
-			overview: isOverview()
-		};
-
-	}
-
-	/**
-	 * Restores the presentation to the given state.
-	 *
-	 * @param {Object} state As generated by getState()
-	 */
-	function setState( state ) {
-
-		if( typeof state === 'object' ) {
-			slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
-
-			var pausedFlag = deserialize( state.paused ),
-				overviewFlag = deserialize( state.overview );
-
-			if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
-				togglePause( pausedFlag );
-			}
-
-			if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
-				toggleOverview( overviewFlag );
-			}
-		}
-
-	}
-
-	/**
-	 * Return a sorted fragments list, ordered by an increasing
-	 * "data-fragment-index" attribute.
-	 *
-	 * Fragments will be revealed in the order that they are returned by
-	 * this function, so you can use the index attributes to control the
-	 * order of fragment appearance.
-	 *
-	 * To maintain a sensible default fragment order, fragments are presumed
-	 * to be passed in document order. This function adds a "fragment-index"
-	 * attribute to each node if such an attribute is not already present,
-	 * and sets that attribute to an integer value which is the position of
-	 * the fragment within the fragments list.
-	 */
-	function sortFragments( fragments ) {
-
-		fragments = toArray( fragments );
-
-		var ordered = [],
-			unordered = [],
-			sorted = [];
-
-		// Group ordered and unordered elements
-		fragments.forEach( function( fragment, i ) {
-			if( fragment.hasAttribute( 'data-fragment-index' ) ) {
-				var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
-
-				if( !ordered[index] ) {
-					ordered[index] = [];
-				}
-
-				ordered[index].push( fragment );
-			}
-			else {
-				unordered.push( [ fragment ] );
-			}
-		} );
-
-		// Append fragments without explicit indices in their
-		// DOM order
-		ordered = ordered.concat( unordered );
-
-		// Manually count the index up per group to ensure there
-		// are no gaps
-		var index = 0;
-
-		// Push all fragments in their sorted order to an array,
-		// this flattens the groups
-		ordered.forEach( function( group ) {
-			group.forEach( function( fragment ) {
-				sorted.push( fragment );
-				fragment.setAttribute( 'data-fragment-index', index );
-			} );
-
-			index ++;
-		} );
-
-		return sorted;
-
-	}
-
-	/**
-	 * Navigate to the specified slide fragment.
-	 *
-	 * @param {Number} index The index of the fragment that
-	 * should be shown, -1 means all are invisible
-	 * @param {Number} offset Integer offset to apply to the
-	 * fragment index
-	 *
-	 * @return {Boolean} true if a change was made in any
-	 * fragments visibility as part of this call
-	 */
-	function navigateFragment( index, offset ) {
-
-		if( currentSlide && config.fragments ) {
-
-			var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
-			if( fragments.length ) {
-
-				// If no index is specified, find the current
-				if( typeof index !== 'number' ) {
-					var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
-
-					if( lastVisibleFragment ) {
-						index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
-					}
-					else {
-						index = -1;
-					}
-				}
-
-				// If an offset is specified, apply it to the index
-				if( typeof offset === 'number' ) {
-					index += offset;
-				}
-
-				var fragmentsShown = [],
-					fragmentsHidden = [];
-
-				toArray( fragments ).forEach( function( element, i ) {
-
-					if( element.hasAttribute( 'data-fragment-index' ) ) {
-						i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
-					}
-
-					// Visible fragments
-					if( i <= index ) {
-						if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
-						element.classList.add( 'visible' );
-						element.classList.remove( 'current-fragment' );
-
-						// Announce the fragments one by one to the Screen Reader
-						dom.statusDiv.textContent = element.textContent;
-
-						if( i === index ) {
-							element.classList.add( 'current-fragment' );
-						}
-					}
-					// Hidden fragments
-					else {
-						if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
-						element.classList.remove( 'visible' );
-						element.classList.remove( 'current-fragment' );
-					}
-
-
-				} );
-
-				if( fragmentsHidden.length ) {
-					dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
-				}
-
-				if( fragmentsShown.length ) {
-					dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
-				}
-
-				updateControls();
-				updateProgress();
-
-				return !!( fragmentsShown.length || fragmentsHidden.length );
-
-			}
-
-		}
-
-		return false;
-
-	}
-
-	/**
-	 * Navigate to the next slide fragment.
-	 *
-	 * @return {Boolean} true if there was a next fragment,
-	 * false otherwise
-	 */
-	function nextFragment() {
-
-		return navigateFragment( null, 1 );
-
-	}
-
-	/**
-	 * Navigate to the previous slide fragment.
-	 *
-	 * @return {Boolean} true if there was a previous fragment,
-	 * false otherwise
-	 */
-	function previousFragment() {
-
-		return navigateFragment( null, -1 );
-
-	}
-
-	/**
-	 * Cues a new automated slide if enabled in the config.
-	 */
-	function cueAutoSlide() {
-
-		cancelAutoSlide();
-
-		if( currentSlide ) {
-
-			var currentFragment = currentSlide.querySelector( '.current-fragment' );
-
-			var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
-			var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
-			var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
-
-			// Pick value in the following priority order:
-			// 1. Current fragment's data-autoslide
-			// 2. Current slide's data-autoslide
-			// 3. Parent slide's data-autoslide
-			// 4. Global autoSlide setting
-			if( fragmentAutoSlide ) {
-				autoSlide = parseInt( fragmentAutoSlide, 10 );
-			}
-			else if( slideAutoSlide ) {
-				autoSlide = parseInt( slideAutoSlide, 10 );
-			}
-			else if( parentAutoSlide ) {
-				autoSlide = parseInt( parentAutoSlide, 10 );
-			}
-			else {
-				autoSlide = config.autoSlide;
-			}
-
-			// If there are media elements with data-autoplay,
-			// automatically set the autoSlide duration to the
-			// length of that media. Not applicable if the slide
-			// is divided up into fragments.
-			if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
-				toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
-					if( el.hasAttribute( 'data-autoplay' ) ) {
-						if( autoSlide && el.duration * 1000 > autoSlide ) {
-							autoSlide = ( el.duration * 1000 ) + 1000;
-						}
-					}
-				} );
-			}
-
-			// Cue the next auto-slide if:
-			// - There is an autoSlide value
-			// - Auto-sliding isn't paused by the user
-			// - The presentation isn't paused
-			// - The overview isn't active
-			// - The presentation isn't over
-			if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
-				autoSlideTimeout = setTimeout( navigateNext, autoSlide );
-				autoSlideStartTime = Date.now();
-			}
-
-			if( autoSlidePlayer ) {
-				autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
-			}
-
-		}
-
-	}
-
-	/**
-	 * Cancels any ongoing request to auto-slide.
-	 */
-	function cancelAutoSlide() {
-
-		clearTimeout( autoSlideTimeout );
-		autoSlideTimeout = -1;
-
-	}
-
-	function pauseAutoSlide() {
-
-		if( autoSlide && !autoSlidePaused ) {
-			autoSlidePaused = true;
-			dispatchEvent( 'autoslidepaused' );
-			clearTimeout( autoSlideTimeout );
-
-			if( autoSlidePlayer ) {
-				autoSlidePlayer.setPlaying( false );
-			}
-		}
-
-	}
-
-	function resumeAutoSlide() {
-
-		if( autoSlide && autoSlidePaused ) {
-			autoSlidePaused = false;
-			dispatchEvent( 'autoslideresumed' );
-			cueAutoSlide();
-		}
-
-	}
-
-	function navigateLeft() {
-
-		// Reverse for RTL
-		if( config.rtl ) {
-			if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
-				slide( indexh + 1 );
-			}
-		}
-		// Normal navigation
-		else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
-			slide( indexh - 1 );
-		}
-
-	}
-
-	function navigateRight() {
-
-		// Reverse for RTL
-		if( config.rtl ) {
-			if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
-				slide( indexh - 1 );
-			}
-		}
-		// Normal navigation
-		else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
-			slide( indexh + 1 );
-		}
-
-	}
-
-	function navigateUp() {
-
-		// Prioritize hiding fragments
-		if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
-			slide( indexh, indexv - 1 );
-		}
-
-	}
-
-	function navigateDown() {
-
-		// Prioritize revealing fragments
-		if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
-			slide( indexh, indexv + 1 );
-		}
-
-	}
-
-	/**
-	 * Navigates backwards, prioritized in the following order:
-	 * 1) Previous fragment
-	 * 2) Previous vertical slide
-	 * 3) Previous horizontal slide
-	 */
-	function navigatePrev() {
-
-		// Prioritize revealing fragments
-		if( previousFragment() === false ) {
-			if( availableRoutes().up ) {
-				navigateUp();
-			}
-			else {
-				// Fetch the previous horizontal slide, if there is one
-				var previousSlide;
-
-				if( config.rtl ) {
-					previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
-				}
-				else {
-					previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
-				}
-
-				if( previousSlide ) {
-					var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
-					var h = indexh - 1;
-					slide( h, v );
-				}
-			}
-		}
-
-	}
-
-	/**
-	 * The reverse of #navigatePrev().
-	 */
-	function navigateNext() {
-
-		// Prioritize revealing fragments
-		if( nextFragment() === false ) {
-			if( availableRoutes().down ) {
-				navigateDown();
-			}
-			else if( config.rtl ) {
-				navigateLeft();
-			}
-			else {
-				navigateRight();
-			}
-		}
-
-		// If auto-sliding is enabled we need to cue up
-		// another timeout
-		cueAutoSlide();
-
-	}
-
-	/**
-	 * Checks if the target element prevents the triggering of
-	 * swipe navigation.
-	 */
-	function isSwipePrevented( target ) {
-
-		while( target && typeof target.hasAttribute === 'function' ) {
-			if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
-			target = target.parentNode;
-		}
-
-		return false;
-
-	}
-
-
-	// --------------------------------------------------------------------//
-	// ----------------------------- EVENTS -------------------------------//
-	// --------------------------------------------------------------------//
-
-	/**
-	 * Called by all event handlers that are based on user
-	 * input.
-	 */
-	function onUserInput( event ) {
-
-		if( config.autoSlideStoppable ) {
-			pauseAutoSlide();
-		}
-
-	}
-
-	/**
-	 * Handler for the document level 'keypress' event.
-	 */
-	function onDocumentKeyPress( event ) {
-
-		// Check if the pressed key is question mark
-		if( event.shiftKey && event.charCode === 63 ) {
-			if( dom.overlay ) {
-				closeOverlay();
-			}
-			else {
-				showHelp( true );
-			}
-		}
-
-	}
-
-	/**
-	 * Handler for the document level 'keydown' event.
-	 */
-	function onDocumentKeyDown( event ) {
-
-		// If there's a condition specified and it returns false,
-		// ignore this event
-		if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
-			return true;
-		}
-
-		// Remember if auto-sliding was paused so we can toggle it
-		var autoSlideWasPaused = autoSlidePaused;
-
-		onUserInput( event );
-
-		// Check if there's a focused element that could be using
-		// the keyboard
-		var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
-		var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
-
-		// Disregard the event if there's a focused element or a
-		// keyboard modifier key is present
-		if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
-
-		// While paused only allow resume keyboard events; 'b', '.''
-		var resumeKeyCodes = [66,190,191];
-		var key;
-
-		// Custom key bindings for togglePause should be able to resume
-		if( typeof config.keyboard === 'object' ) {
-			for( key in config.keyboard ) {
-				if( config.keyboard[key] === 'togglePause' ) {
-					resumeKeyCodes.push( parseInt( key, 10 ) );
-				}
-			}
-		}
-
-		if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
-			return false;
-		}
-
-		var triggered = false;
-
-		// 1. User defined key bindings
-		if( typeof config.keyboard === 'object' ) {
-
-			for( key in config.keyboard ) {
-
-				// Check if this binding matches the pressed key
-				if( parseInt( key, 10 ) === event.keyCode ) {
-
-					var value = config.keyboard[ key ];
-
-					// Callback function
-					if( typeof value === 'function' ) {
-						value.apply( null, [ event ] );
-					}
-					// String shortcuts to reveal.js API
-					else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
-						Reveal[ value ].call();
-					}
-
-					triggered = true;
-
-				}
-
-			}
-
-		}
-
-		// 2. System defined key bindings
-		if( triggered === false ) {
-
-			// Assume true and try to prove false
-			triggered = true;
-
-			switch( event.keyCode ) {
-				// p, page up
-				case 80: case 33: navigatePrev(); break;
-				// n, page down
-				case 78: case 34: navigateNext(); break;
-				// h, left
-				case 72: case 37: navigateLeft(); break;
-				// l, right
-				case 76: case 39: navigateRight(); break;
-				// k, up
-				case 75: case 38: navigateUp(); break;
-				// j, down
-				case 74: case 40: navigateDown(); break;
-				// home
-				case 36: slide( 0 ); break;
-				// end
-				case 35: slide( Number.MAX_VALUE ); break;
-				// space
-				case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
-				// return
-				case 13: isOverview() ? deactivateOverview() : triggered = false; break;
-				// two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
-				case 58: case 59: case 66: case 190: case 191: togglePause(); break;
-				// f
-				case 70: enterFullscreen(); break;
-				// a
-				case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
-				default:
-					triggered = false;
-			}
-
-		}
-
-		// If the input resulted in a triggered action we should prevent
-		// the browsers default behavior
-		if( triggered ) {
-			event.preventDefault && event.preventDefault();
-		}
-		// ESC or O key
-		else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
-			if( dom.overlay ) {
-				closeOverlay();
-			}
-			else {
-				toggleOverview();
-			}
-
-			event.preventDefault && event.preventDefault();
-		}
-
-		// If auto-sliding is enabled we need to cue up
-		// another timeout
-		cueAutoSlide();
-
-	}
-
-	/**
-	 * Handler for the 'touchstart' event, enables support for
-	 * swipe and pinch gestures.
-	 */
-	function onTouchStart( event ) {
-
-		if( isSwipePrevented( event.target ) ) return true;
-
-		touch.startX = event.touches[0].clientX;
-		touch.startY = event.touches[0].clientY;
-		touch.startCount = event.touches.length;
-
-		// If there's two touches we need to memorize the distance
-		// between those two points to detect pinching
-		if( event.touches.length === 2 && config.overview ) {
-			touch.startSpan = distanceBetween( {
-				x: event.touches[1].clientX,
-				y: event.touches[1].clientY
-			}, {
-				x: touch.startX,
-				y: touch.startY
-			} );
-		}
-
-	}
-
-	/**
-	 * Handler for the 'touchmove' event.
-	 */
-	function onTouchMove( event ) {
-
-		if( isSwipePrevented( event.target ) ) return true;
-
-		// Each touch should only trigger one action
-		if( !touch.captured ) {
-			onUserInput( event );
-
-			var currentX = event.touches[0].clientX;
-			var currentY = event.touches[0].clientY;
-
-			// If the touch started with two points and still has
-			// two active touches; test for the pinch gesture
-			if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
-
-				// The current distance in pixels between the two touch points
-				var currentSpan = distanceBetween( {
-					x: event.touches[1].clientX,
-					y: event.touches[1].clientY
-				}, {
-					x: touch.startX,
-					y: touch.startY
-				} );
-
-				// If the span is larger than the desire amount we've got
-				// ourselves a pinch
-				if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
-					touch.captured = true;
-
-					if( currentSpan < touch.startSpan ) {
-						activateOverview();
-					}
-					else {
-						deactivateOverview();
-					}
-				}
-
-				event.preventDefault();
-
-			}
-			// There was only one touch point, look for a swipe
-			else if( event.touches.length === 1 && touch.startCount !== 2 ) {
-
-				var deltaX = currentX - touch.startX,
-					deltaY = currentY - touch.startY;
-
-				if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
-					touch.captured = true;
-					navigateLeft();
-				}
-				else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
-					touch.captured = true;
-					navigateRight();
-				}
-				else if( deltaY > touch.threshold ) {
-					touch.captured = true;
-					navigateUp();
-				}
-				else if( deltaY < -touch.threshold ) {
-					touch.captured = true;
-					navigateDown();
-				}
-
-				// If we're embedded, only block touch events if they have
-				// triggered an action
-				if( config.embedded ) {
-					if( touch.captured || isVerticalSlide( currentSlide ) ) {
-						event.preventDefault();
-					}
-				}
-				// Not embedded? Block them all to avoid needless tossing
-				// around of the viewport in iOS
-				else {
-					event.preventDefault();
-				}
-
-			}
-		}
-		// There's a bug with swiping on some Android devices unless
-		// the default action is always prevented
-		else if( navigator.userAgent.match( /android/gi ) ) {
-			event.preventDefault();
-		}
-
-	}
-
-	/**
-	 * Handler for the 'touchend' event.
-	 */
-	function onTouchEnd( event ) {
-
-		touch.captured = false;
-
-	}
-
-	/**
-	 * Convert pointer down to touch start.
-	 */
-	function onPointerDown( event ) {
-
-		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
-			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
-			onTouchStart( event );
-		}
-
-	}
-
-	/**
-	 * Convert pointer move to touch move.
-	 */
-	function onPointerMove( event ) {
-
-		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
-			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
-			onTouchMove( event );
-		}
-
-	}
-
-	/**
-	 * Convert pointer up to touch end.
-	 */
-	function onPointerUp( event ) {
-
-		if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" )  {
-			event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
-			onTouchEnd( event );
-		}
-
-	}
-
-	/**
-	 * Handles mouse wheel scrolling, throttled to avoid skipping
-	 * multiple slides.
-	 */
-	function onDocumentMouseScroll( event ) {
-
-		if( Date.now() - lastMouseWheelStep > 600 ) {
-
-			lastMouseWheelStep = Date.now();
-
-			var delta = event.detail || -event.wheelDelta;
-			if( delta > 0 ) {
-				navigateNext();
-			}
-			else {
-				navigatePrev();
-			}
-
-		}
-
-	}
-
-	/**
-	 * Clicking on the progress bar results in a navigation to the
-	 * closest approximate horizontal slide using this equation:
-	 *
-	 * ( clickX / presentationWidth ) * numberOfSlides
-	 */
-	function onProgressClicked( event ) {
-
-		onUserInput( event );
-
-		event.preventDefault();
-
-		var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
-		var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
-
-		if( config.rtl ) {
-			slideIndex = slidesTotal - slideIndex;
-		}
-
-		slide( slideIndex );
-
-	}
-
-	/**
-	 * Event handler for navigation control buttons.
-	 */
-	function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
-	function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
-	function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
-	function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
-	function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
-	function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
-
-	/**
-	 * Handler for the window level 'hashchange' event.
-	 */
-	function onWindowHashChange( event ) {
-
-		readURL();
-
-	}
-
-	/**
-	 * Handler for the window level 'resize' event.
-	 */
-	function onWindowResize( event ) {
-
-		layout();
-
-	}
-
-	/**
-	 * Handle for the window level 'visibilitychange' event.
-	 */
-	function onPageVisibilityChange( event ) {
-
-		var isHidden =  document.webkitHidden ||
-						document.msHidden ||
-						document.hidden;
-
-		// If, after clicking a link or similar and we're coming back,
-		// focus the document.body to ensure we can use keyboard shortcuts
-		if( isHidden === false && document.activeElement !== document.body ) {
-			// Not all elements support .blur() - SVGs among them.
-			if( typeof document.activeElement.blur === 'function' ) {
-				document.activeElement.blur();
-			}
-			document.body.focus();
-		}
-
-	}
-
-	/**
-	 * Invoked when a slide is and we're in the overview.
-	 */
-	function onOverviewSlideClicked( event ) {
-
-		// TODO There's a bug here where the event listeners are not
-		// removed after deactivating the overview.
-		if( eventsAreBound && isOverview() ) {
-			event.preventDefault();
-
-			var element = event.target;
-
-			while( element && !element.nodeName.match( /section/gi ) ) {
-				element = element.parentNode;
-			}
-
-			if( element && !element.classList.contains( 'disabled' ) ) {
-
-				deactivateOverview();
-
-				if( element.nodeName.match( /section/gi ) ) {
-					var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
-						v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
-
-					slide( h, v );
-				}
-
-			}
-		}
-
-	}
-
-	/**
-	 * Handles clicks on links that are set to preview in the
-	 * iframe overlay.
-	 */
-	function onPreviewLinkClicked( event ) {
-
-		if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
-			var url = event.currentTarget.getAttribute( 'href' );
-			if( url ) {
-				showPreview( url );
-				event.preventDefault();
-			}
-		}
-
-	}
-
-	/**
-	 * Handles click on the auto-sliding controls element.
-	 */
-	function onAutoSlidePlayerClick( event ) {
-
-		// Replay
-		if( Reveal.isLastSlide() && config.loop === false ) {
-			slide( 0, 0 );
-			resumeAutoSlide();
-		}
-		// Resume
-		else if( autoSlidePaused ) {
-			resumeAutoSlide();
-		}
-		// Pause
-		else {
-			pauseAutoSlide();
-		}
-
-	}
-
-
-	// --------------------------------------------------------------------//
-	// ------------------------ PLAYBACK COMPONENT ------------------------//
-	// --------------------------------------------------------------------//
-
-
-	/**
-	 * Constructor for the playback component, which displays
-	 * play/pause/progress controls.
-	 *
-	 * @param {HTMLElement} container The component will append
-	 * itself to this
-	 * @param {Function} progressCheck A method which will be
-	 * called frequently to get the current progress on a range
-	 * of 0-1
-	 */
-	function Playback( container, progressCheck ) {
-
-		// Cosmetics
-		this.diameter = 50;
-		this.thickness = 3;
-
-		// Flags if we are currently playing
-		this.playing = false;
-
-		// Current progress on a 0-1 range
-		this.progress = 0;
-
-		// Used to loop the animation smoothly
-		this.progressOffset = 1;
-
-		this.container = container;
-		this.progressCheck = progressCheck;
-
-		this.canvas = document.createElement( 'canvas' );
-		this.canvas.className = 'playback';
-		this.canvas.width = this.diameter;
-		this.canvas.height = this.diameter;
-		this.context = this.canvas.getContext( '2d' );
-
-		this.container.appendChild( this.canvas );
-
-		this.render();
-
-	}
-
-	Playback.prototype.setPlaying = function( value ) {
-
-		var wasPlaying = this.playing;
-
-		this.playing = value;
-
-		// Start repainting if we weren't already
-		if( !wasPlaying && this.playing ) {
-			this.animate();
-		}
-		else {
-			this.render();
-		}
-
-	};
-
-	Playback.prototype.animate = function() {
-
-		var progressBefore = this.progress;
-
-		this.progress = this.progressCheck();
-
-		// When we loop, offset the progress so that it eases
-		// smoothly rather than immediately resetting
-		if( progressBefore > 0.8 && this.progress < 0.2 ) {
-			this.progressOffset = this.progress;
-		}
-
-		this.render();
-
-		if( this.playing ) {
-			features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
-		}
-
-	};
-
-	/**
-	 * Renders the current progress and playback state.
-	 */
-	Playback.prototype.render = function() {
-
-		var progress = this.playing ? this.progress : 0,
-			radius = ( this.diameter / 2 ) - this.thickness,
-			x = this.diameter / 2,
-			y = this.diameter / 2,
-			iconSize = 14;
-
-		// Ease towards 1
-		this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
-
-		var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
-		var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
-
-		this.context.save();
-		this.context.clearRect( 0, 0, this.diameter, this.diameter );
-
-		// Solid background color
-		this.context.beginPath();
-		this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
-		this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
-		this.context.fill();
-
-		// Draw progress track
-		this.context.beginPath();
-		this.context.arc( x, y, radius, 0, Math.PI * 2, false );
-		this.context.lineWidth = this.thickness;
-		this.context.strokeStyle = '#666';
-		this.context.stroke();
-
-		if( this.playing ) {
-			// Draw progress on top of track
-			this.context.beginPath();
-			this.context.arc( x, y, radius, startAngle, endAngle, false );
-			this.context.lineWidth = this.thickness;
-			this.context.strokeStyle = '#fff';
-			this.context.stroke();
-		}
-
-		this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
-
-		// Draw play/pause icons
-		if( this.playing ) {
-			this.context.fillStyle = '#fff';
-			this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
-			this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
-		}
-		else {
-			this.context.beginPath();
-			this.context.translate( 2, 0 );
-			this.context.moveTo( 0, 0 );
-			this.context.lineTo( iconSize - 2, iconSize / 2 );
-			this.context.lineTo( 0, iconSize );
-			this.context.fillStyle = '#fff';
-			this.context.fill();
-		}
-
-		this.context.restore();
-
-	};
-
-	Playback.prototype.on = function( type, listener ) {
-		this.canvas.addEventListener( type, listener, false );
-	};
-
-	Playback.prototype.off = function( type, listener ) {
-		this.canvas.removeEventListener( type, listener, false );
-	};
-
-	Playback.prototype.destroy = function() {
-
-		this.playing = false;
-
-		if( this.canvas.parentNode ) {
-			this.container.removeChild( this.canvas );
-		}
-
-	};
-
-
-	// --------------------------------------------------------------------//
-	// ------------------------------- API --------------------------------//
-	// --------------------------------------------------------------------//
-
-
-	Reveal = {
-		initialize: initialize,
-		configure: configure,
-		sync: sync,
-
-		// Navigation methods
-		slide: slide,
-		left: navigateLeft,
-		right: navigateRight,
-		up: navigateUp,
-		down: navigateDown,
-		prev: navigatePrev,
-		next: navigateNext,
-
-		// Fragment methods
-		navigateFragment: navigateFragment,
-		prevFragment: previousFragment,
-		nextFragment: nextFragment,
-
-		// Deprecated aliases
-		navigateTo: slide,
-		navigateLeft: navigateLeft,
-		navigateRight: navigateRight,
-		navigateUp: navigateUp,
-		navigateDown: navigateDown,
-		navigatePrev: navigatePrev,
-		navigateNext: navigateNext,
-
-		// Forces an update in slide layout
-		layout: layout,
-
-		// Returns an object with the available routes as booleans (left/right/top/bottom)
-		availableRoutes: availableRoutes,
-
-		// Returns an object with the available fragments as booleans (prev/next)
-		availableFragments: availableFragments,
-
-		// Toggles the overview mode on/off
-		toggleOverview: toggleOverview,
-
-		// Toggles the "black screen" mode on/off
-		togglePause: togglePause,
-
-		// Toggles the auto slide mode on/off
-		toggleAutoSlide: toggleAutoSlide,
-
-		// State checks
-		isOverview: isOverview,
-		isPaused: isPaused,
-		isAutoSliding: isAutoSliding,
-
-		// Adds or removes all internal event listeners (such as keyboard)
-		addEventListeners: addEventListeners,
-		removeEventListeners: removeEventListeners,
-
-		// Facility for persisting and restoring the presentation state
-		getState: getState,
-		setState: setState,
-
-		// Presentation progress on range of 0-1
-		getProgress: getProgress,
-
-		// Returns the indices of the current, or specified, slide
-		getIndices: getIndices,
-
-		getTotalSlides: getTotalSlides,
-
-		// Returns the slide element at the specified index
-		getSlide: getSlide,
-
-		// Returns the slide background element at the specified index
-		getSlideBackground: getSlideBackground,
-
-		// Returns the speaker notes string for a slide, or null
-		getSlideNotes: getSlideNotes,
-
-		// Returns the previous slide element, may be null
-		getPreviousSlide: function() {
-			return previousSlide;
-		},
-
-		// Returns the current slide element
-		getCurrentSlide: function() {
-			return currentSlide;
-		},
-
-		// Returns the current scale of the presentation content
-		getScale: function() {
-			return scale;
-		},
-
-		// Returns the current configuration object
-		getConfig: function() {
-			return config;
-		},
-
-		// Helper method, retrieves query string as a key/value hash
-		getQueryHash: function() {
-			var query = {};
-
-			location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
-				query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
-			} );
-
-			// Basic deserialization
-			for( var i in query ) {
-				var value = query[ i ];
-
-				query[ i ] = deserialize( unescape( value ) );
-			}
-
-			return query;
-		},
-
-		// Returns true if we're currently on the first slide
-		isFirstSlide: function() {
-			return ( indexh === 0 && indexv === 0 );
-		},
-
-		// Returns true if we're currently on the last slide
-		isLastSlide: function() {
-			if( currentSlide ) {
-				// Does this slide has next a sibling?
-				if( currentSlide.nextElementSibling ) return false;
-
-				// If it's vertical, does its parent have a next sibling?
-				if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
-
-				return true;
-			}
-
-			return false;
-		},
-
-		// Checks if reveal.js has been loaded and is ready for use
-		isReady: function() {
-			return loaded;
-		},
-
-		// Forward event binding to the reveal DOM element
-		addEventListener: function( type, listener, useCapture ) {
-			if( 'addEventListener' in window ) {
-				( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
-			}
-		},
-		removeEventListener: function( type, listener, useCapture ) {
-			if( 'addEventListener' in window ) {
-				( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
-			}
-		},
-
-		// Programatically triggers a keyboard event
-		triggerKey: function( keyCode ) {
-			onDocumentKeyDown( { keyCode: keyCode } );
-		}
-	};
-
-	return Reveal;
-
-}));