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		return new Promise( resolve => Reveal.on( 'ready', resolve ) );

	}

	/**
	 * Encase the presentation in a reveal.js viewport. The
	 * extent of the viewport differs based on configuration.
	 */
	function setViewport() {

		// Embedded decks use the reveal element as their viewport
		if( config.embedded === true ) {
			dom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;
		}
		// Full-page decks use the body as their viewport
		else {
			dom.viewport = document.body;
			document.documentElement.classList.add( 'reveal-full-page' );
		}

		dom.viewport.classList.add( 'reveal-viewport' );

	}

	/**
	 * Starts up reveal.js by binding input events and navigating
	 * to the current URL deeplink if there is one.
	 */
	function start() {

		ready = true;

		// Remove slides hidden with data-visibility
		removeHiddenSlides();

		// Make sure we've got all the DOM elements we need
		setupDOM();

		// Listen to messages posted to this window
		setupPostMessage();

		// Prevent the slides from being scrolled out of view
		setupScrollPrevention();

		// Adds bindings for fullscreen mode
		setupFullscreen();

		// 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
		location.readURL();

		// Create slide backgrounds
		backgrounds.update( true );

		// Notify listeners that the presentation is ready but use a 1ms
		// timeout to ensure it's not fired synchronously after #initialize()
		setTimeout( () => {
			// Enable transitions now that we're loaded
			dom.slides.classList.remove( 'no-transition' );

			dom.wrapper.classList.add( 'ready' );

			dispatchEvent({
				type: 'ready',
				data: {
					indexh,
					indexv,
					currentSlide
				}
			});
		}, 1 );

		// Special setup and config is required when printing to PDF
		if( print.isPrintingPDF() ) {
			removeEventListeners();

			// The document needs to have loaded for the PDF layout
			// measurements to be accurate
			if( document.readyState === 'complete' ) {
				print.setupPDF();
			}
			else {
				window.addEventListener( 'load', () => {
					print.setupPDF();
				} );
			}
		}

	}

	/**
	 * Removes all slides with data-visibility="hidden". This
	 * is done right before the rest of the presentation is
	 * initialized.
	 *
	 * If you want to show all hidden slides, initialize
	 * reveal.js with showHiddenSlides set to true.
	 */
	function removeHiddenSlides() {

		if( !config.showHiddenSlides ) {
			Util.queryAll( dom.wrapper, 'section[data-visibility="hidden"]' ).forEach( slide => {
				slide.parentNode.removeChild( slide );
			} );
		}

	}

	/**
	 * 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