diff --git a/demo.html b/demo.html
index 685667d4..6d1f923c 100644
--- a/demo.html
+++ b/demo.html
@@ -458,6 +458,9 @@ Reveal.on( 'customevent', function() {
 		<script src="plugin/highlight/highlight.js"></script>
 		<script>
 
+			console.time( 'print' )
+			Reveal.addEventListener( 'pdf-ready', () => console.timeEnd( 'print' ) );
+
 			// Also available as an ES module, see:
 			// https://revealjs.com/initialization/
 			Reveal.initialize({
diff --git a/dist/reveal.esm.js b/dist/reveal.esm.js
index e9e202a9..4f2d38a2 100644
--- a/dist/reveal.esm.js
+++ b/dist/reveal.esm.js
@@ -5,5 +5,5 @@
 *
 * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
 */
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t=this.createBackground(e,this.element);rt(e,"section").forEach((e=>{this.createBackground(e,t),t.classList.add("stack")}))})),this.Reveal.getConfig().parallaxBackgroundImage?(this.element.style.backgroundImage='url("'+this.Reveal.getConfig().parallaxBackgroundImage+'")',this.element.style.backgroundSize=this.Reveal.getConfig().parallaxBackgroundSize,this.element.style.backgroundRepeat=this.Reveal.getConfig().parallaxBackgroundRepeat,this.element.style.backgroundPosition=this.Reveal.getConfig().parallaxBackgroundPosition,setTimeout((()=>{this.Reveal.getRevealElement().classList.add("has-parallax-background")}),1)):(this.element.style.backgroundImage="",this.Reveal.getRevealElement().classList.remove("has-parallax-background"))}createBackground(e,t){let i=document.createElement("div");i.className="slide-background "+e.className.replace(/present|past|future/,"");let n=document.createElement("div");return 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diff --git a/dist/reveal.js b/dist/reveal.js
index 4f9aa655..a8ddd6d6 100644
--- a/dist/reveal.js
+++ b/dist/reveal.js
@@ -5,5 +5,5 @@
 *
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 */
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i={background:e.getAttribute("data-background"),backgroundSize:e.getAttribute("data-background-size"),backgroundImage:e.getAttribute("data-background-image"),backgroundVideo:e.getAttribute("data-background-video"),backgroundIframe:e.getAttribute("data-background-iframe"),backgroundColor:e.getAttribute("data-background-color"),backgroundRepeat:e.getAttribute("data-background-repeat"),backgroundPosition:e.getAttribute("data-background-position"),backgroundTransition:e.getAttribute("data-background-transition"),backgroundOpacity:e.getAttribute("data-background-opacity")};i.background&&(/^(http|file|\/\/)/gi.test(i.background)||/\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test(i.background)?e.setAttribute("data-background-image",i.background):t.style.background=i.background),(i.background||i.backgroundColor||i.backgroundImage||i.backgroundVideo||i.backgroundIframe)&&t.setAttribute("data-background-hash",i.background+i.backgroundSize+i.backgroundImage+i.backgroundVideo+i.backgroundIframe+i.backgroundColor+i.backgroundRepeat+i.backgroundPosition+i.backgroundTransition+i.backgroundOpacity),i.backgroundSize&&t.setAttribute("data-background-size",i.backgroundSize),i.backgroundColor&&(t.style.backgroundColor=i.backgroundColor),i.backgroundTransition&&t.setAttribute("data-background-transition",i.backgroundTransition),e.hasAttribute("data-preload")&&t.setAttribute("data-preload",""),i.backgroundSize&&(n.style.backgroundSize=i.backgroundSize),i.backgroundRepeat&&(n.style.backgroundRepeat=i.backgroundRepeat),i.backgroundPosition&&(n.style.backgroundPosition=i.backgroundPosition),i.backgroundOpacity&&(n.style.opacity=i.backgroundOpacity);var 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t=this.Reveal.getScale();return{x:Math.round(e.offsetLeft*t*100)/100,y:Math.round(e.offsetTop*t*100)/100,width:Math.round(e.offsetWidth*t*100)/100,height:Math.round(e.offsetHeight*t*100)/100}}},{key:"findAutoAnimateMatches",value:function(e,t,n,i,r,a){var o={},s={};[].slice.call(t.querySelectorAll(i)).forEach((function(e,t){var n=r(e);"string"==typeof n&&n.length&&(o[n]=o[n]||[],o[n].push(e))})),[].slice.call(n.querySelectorAll(i)).forEach((function(t,n){var i,l=r(t);if(s[l]=s[l]||[],s[l].push(t),o[l]){var u=s[l].length-1,c=o[l].length-1;o[l][u]?(i=o[l][u],o[l][u]=null):o[l][c]&&(i=o[l][c],o[l][c]=null)}i&&e.push({from:i,to:t,options:a})}))}},{key:"getUnmatchedAutoAnimateElements",value:function(e){var t=this;return[].slice.call(e.children).reduce((function(e,n){var i=n.querySelector("[data-auto-animate-target]");return n.hasAttribute("data-auto-animate-target")||i||e.push(n),n.querySelector("[data-auto-animate-target]")&&(e=e.concat(t.getUnmatchedAutoAnimateElements(n))),e}),[])}}]),e}(),us=function(){function e(t){io(this,e),this.Reveal=t}return ao(e,[{key:"configure",value:function(e,t){!1===e.fragments?this.disable():!1===t.fragments&&this.enable()}},{key:"disable",value:function(){Lo(this.Reveal.getSlidesElement(),".fragment").forEach((function(e){e.classList.add("visible"),e.classList.remove("current-fragment")}))}},{key:"enable",value:function(){Lo(this.Reveal.getSlidesElement(),".fragment").forEach((function(e){e.classList.remove("visible"),e.classList.remove("current-fragment")}))}},{key:"availableRoutes",value:function(){var e=this.Reveal.getCurrentSlide();if(e&&this.Reveal.getConfig().fragments){var t=e.querySelectorAll(".fragment:not(.disabled)"),n=e.querySelectorAll(".fragment:not(.disabled):not(.visible)");return{prev:t.length-n.length>0,next:!!n.length}}return{prev:!1,next:!1}}},{key:"sort",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]&&arguments[1];e=Array.from(e);var n=[],i=[],r=[];e.forEach((function(e){if(e.hasAttribute("data-fragment-index")){var t=parseInt(e.getAttribute("data-fragment-index"),10);n[t]||(n[t]=[]),n[t].push(e)}else i.push([e])})),n=n.concat(i);var a=0;return n.forEach((function(e){e.forEach((function(e){r.push(e),e.setAttribute("data-fragment-index",a)})),a++})),!0===t?n:r}},{key:"sortAll",value:function(){var e=this;this.Reveal.getHorizontalSlides().forEach((function(t){var n=Lo(t,"section");n.forEach((function(t,n){e.sort(t.querySelectorAll(".fragment"))}),e),0===n.length&&e.sort(t.querySelectorAll(".fragment"))}))}},{key:"update",value:function(e,t){var n=this,i={shown:[],hidden:[]},r=this.Reveal.getCurrentSlide();if(r&&this.Reveal.getConfig().fragments&&(t=t||this.sort(r.querySelectorAll(".fragment"))).length){var a=0;if("number"!=typeof e){var o=this.sort(r.querySelectorAll(".fragment.visible")).pop();o&&(e=parseInt(o.getAttribute("data-fragment-index")||0,10))}Array.from(t).forEach((function(t,r){if(t.hasAttribute("data-fragment-index")&&(r=parseInt(t.getAttribute("data-fragment-index"),10)),a=Math.max(a,r),r<=e){var o=t.classList.contains("visible");t.classList.add("visible"),t.classList.remove("current-fragment"),r===e&&(n.Reveal.announceStatus(n.Reveal.getStatusText(t)),t.classList.add("current-fragment"),n.Reveal.slideContent.startEmbeddedContent(t)),o||(i.shown.push(t),n.Reveal.dispatchEvent({target:t,type:"visible",bubbles:!1}))}else{var s=t.classList.contains("visible");t.classList.remove("visible"),t.classList.remove("current-fragment"),s&&(n.Reveal.slideContent.stopEmbeddedContent(t),i.hidden.push(t),n.Reveal.dispatchEvent({target:t,type:"hidden",bubbles:!1}))}})),e="number"==typeof e?e:-1,e=Math.max(Math.min(e,a),-1),r.setAttribute("data-fragment",e)}return i}},{key:"sync",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.Reveal.getCurrentSlide();return this.sort(e.querySelectorAll(".fragment"))}},{key:"goto",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0,n=this.Reveal.getCurrentSlide();if(n&&this.Reveal.getConfig().fragments){var i=this.sort(n.querySelectorAll(".fragment:not(.disabled)"));if(i.length){if("number"!=typeof e){var r=this.sort(n.querySelectorAll(".fragment:not(.disabled).visible")).pop();e=r?parseInt(r.getAttribute("data-fragment-index")||0,10):-1}e+=t;var a=this.update(e,i);return a.hidden.length&&this.Reveal.dispatchEvent({type:"fragmenthidden",data:{fragment:a.hidden[0],fragments:a.hidden}}),a.shown.length&&this.Reveal.dispatchEvent({type:"fragmentshown",data:{fragment:a.shown[0],fragments:a.shown}}),this.Reveal.controls.update(),this.Reveal.progress.update(),this.Reveal.getConfig().fragmentInURL&&this.Reveal.location.writeURL(),!(!a.shown.length&&!a.hidden.length)}}return!1}},{key:"next",value:function(){return this.goto(null,1)}},{key:"prev",value:function(){return this.goto(null,-1)}}]),e}(),cs=function(){function e(t){io(this,e),this.Reveal=t,this.active=!1,this.onSlideClicked=this.onSlideClicked.bind(this)}return ao(e,[{key:"activate",value:function(){var e=this;if(this.Reveal.getConfig().overview&&!this.isActive()){this.active=!0,this.Reveal.getRevealElement().classList.add("overview"),this.Reveal.cancelAutoSlide(),this.Reveal.getSlidesElement().appendChild(this.Reveal.getBackgroundsElement()),Lo(this.Reveal.getRevealElement(),go).forEach((function(t){t.classList.contains("stack")||t.addEventListener("click",e.onSlideClicked,!0)}));var t=this.Reveal.getComputedSlideSize();this.overviewSlideWidth=t.width+70,this.overviewSlideHeight=t.height+70,this.Reveal.getConfig().rtl&&(this.overviewSlideWidth=-this.overviewSlideWidth),this.Reveal.updateSlidesVisibility(),this.layout(),this.update(),this.Reveal.layout();var n=this.Reveal.getIndices();this.Reveal.dispatchEvent({type:"overviewshown",data:{indexh:n.h,indexv:n.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"layout",value:function(){var e=this;this.Reveal.getHorizontalSlides().forEach((function(t,n){t.setAttribute("data-index-h",n),No(t,"translate3d("+n*e.overviewSlideWidth+"px, 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e=this;if(this.Reveal.getConfig().overview){this.active=!1,this.Reveal.getRevealElement().classList.remove("overview"),this.Reveal.getRevealElement().classList.add("overview-deactivating"),setTimeout((function(){e.Reveal.getRevealElement().classList.remove("overview-deactivating")}),1),this.Reveal.getRevealElement().appendChild(this.Reveal.getBackgroundsElement()),Lo(this.Reveal.getRevealElement(),go).forEach((function(t){No(t,""),t.removeEventListener("click",e.onSlideClicked,!0)})),Lo(this.Reveal.getBackgroundsElement(),".slide-background").forEach((function(e){No(e,"")})),this.Reveal.transformSlides({overview:""});var t=this.Reveal.getIndices();this.Reveal.slide(t.h,t.v),this.Reveal.layout(),this.Reveal.cueAutoSlide(),this.Reveal.dispatchEvent({type:"overviewhidden",data:{indexh:t.h,indexv:t.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"toggle",value:function(e){"boolean"==typeof e?e?this.activate():this.deactivate():this.isActive()?this.deactivate():this.activate()}},{key:"isActive",value:function(){return this.active}},{key:"onSlideClicked",value:function(e){if(this.isActive()){e.preventDefault();for(var t=e.target;t&&!t.nodeName.match(/section/gi);)t=t.parentNode;if(t&&!t.classList.contains("disabled")&&(this.deactivate(),t.nodeName.match(/section/gi))){var n=parseInt(t.getAttribute("data-index-h"),10),i=parseInt(t.getAttribute("data-index-v"),10);this.Reveal.slide(n,i)}}}}]),e}(),ds=function(){function e(t){io(this,e),this.Reveal=t,this.shortcuts={},this.bindings={},this.onDocumentKeyDown=this.onDocumentKeyDown.bind(this),this.onDocumentKeyPress=this.onDocumentKeyPress.bind(this)}return ao(e,[{key:"configure",value:function(e,t){"linear"===e.navigationMode?(this.shortcuts["&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J"]="Next slide",this.shortcuts["&#8592;  ,  &#8593;  ,  P  ,  H  ,  K"]="Previous slide"):(this.shortcuts["N  ,  SPACE"]="Next 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overview"}},{key:"bind",value:function(){document.addEventListener("keydown",this.onDocumentKeyDown,!1),document.addEventListener("keypress",this.onDocumentKeyPress,!1)}},{key:"unbind",value:function(){document.removeEventListener("keydown",this.onDocumentKeyDown,!1),document.removeEventListener("keypress",this.onDocumentKeyPress,!1)}},{key:"addKeyBinding",value:function(e,t){"object"===no(e)&&e.keyCode?this.bindings[e.keyCode]={callback:t,key:e.key,description:e.description}:this.bindings[e]={callback:t,key:null,description:null}}},{key:"removeKeyBinding",value:function(e){delete this.bindings[e]}},{key:"triggerKey",value:function(e){this.onDocumentKeyDown({keyCode:e})}},{key:"registerKeyboardShortcut",value:function(e,t){this.shortcuts[e]=t}},{key:"getShortcuts",value:function(){return this.shortcuts}},{key:"getBindings",value:function(){return this.bindings}},{key:"onDocumentKeyPress",value:function(e){e.shiftKey&&63===e.charCode&&this.Reveal.toggleHelp()}},{key:"onDocumentKeyDown",value:function(e){var t=this.Reveal.getConfig();if("function"==typeof t.keyboardCondition&&!1===t.keyboardCondition(e))return!0;if("focused"===t.keyboardCondition&&!this.Reveal.isFocused())return!0;var n=e.keyCode,i=!this.Reveal.isAutoSliding();this.Reveal.onUserInput(e);var r=document.activeElement&&!0===document.activeElement.isContentEditable,a=document.activeElement&&document.activeElement.tagName&&/input|textarea/i.test(document.activeElement.tagName),o=document.activeElement&&document.activeElement.className&&/speaker-notes/i.test(document.activeElement.className),s=e.shiftKey&&32===e.keyCode,l=e.shiftKey&&37===n,u=e.shiftKey&&39===n,c=!s&&!l&&!u&&(e.shiftKey||e.altKey||e.ctrlKey||e.metaKey);if(!(r||a||o||c)){var d,h=[66,86,190,191];if("object"===no(t.keyboard))for(d in 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e(t){io(this,e),this.Reveal=t,this.writeURLTimeout=0,this.onWindowHashChange=this.onWindowHashChange.bind(this)}return ao(e,[{key:"bind",value:function(){window.addEventListener("hashchange",this.onWindowHashChange,!1)}},{key:"unbind",value:function(){window.removeEventListener("hashchange",this.onWindowHashChange,!1)}},{key:"readURL",value:function(){var e=this.Reveal.getConfig(),t=this.Reveal.getIndices(),n=this.Reveal.getCurrentSlide(),i=window.location.hash,r=i.slice(2).split("/"),a=i.replace(/#\/?/gi,"");if(!/^[0-9]*$/.test(r[0])&&a.length){var o,s;/\/[-\d]+$/g.test(a)&&(s=parseInt(a.split("/").pop(),10),s=isNaN(s)?void 0:s,a=a.split("/").shift());try{o=document.getElementById(decodeURIComponent(a))}catch(e){}var l=!!n&&n.getAttribute("id")===a;if(o){if(!l||void 0!==s){var u=this.Reveal.getIndices(o);this.Reveal.slide(u.h,u.v,s)}}else this.Reveal.slide(t.h||0,t.v||0)}else{var 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a=this.Reveal.getConfig().hashOneBasedIndex?1:0;(r.h>0||r.v>0||r.f>=0)&&(t+=r.h+a),(r.v>0||r.f>=0)&&(t+="/"+(r.v+a)),r.f>=0&&(t+="/"+r.f)}return t}},{key:"onWindowHashChange",value:function(e){this.readURL()}}]),e}(),fs=function(){function e(t){io(this,e),this.Reveal=t,this.onNavigateLeftClicked=this.onNavigateLeftClicked.bind(this),this.onNavigateRightClicked=this.onNavigateRightClicked.bind(this),this.onNavigateUpClicked=this.onNavigateUpClicked.bind(this),this.onNavigateDownClicked=this.onNavigateDownClicked.bind(this),this.onNavigatePrevClicked=this.onNavigatePrevClicked.bind(this),this.onNavigateNextClicked=this.onNavigateNextClicked.bind(this)}return ao(e,[{key:"render",value:function(){var e=this.Reveal.getConfig().rtl,t=this.Reveal.getRevealElement();this.element=document.createElement("aside"),this.element.className="controls",this.element.innerHTML='<button class="navigate-left" aria-label="'.concat(e?"next slide":"previous slide",'"><div 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class="controls-arrow"></div></button>'),this.Reveal.getRevealElement().appendChild(this.element),this.controlsLeft=Lo(t,".navigate-left"),this.controlsRight=Lo(t,".navigate-right"),this.controlsUp=Lo(t,".navigate-up"),this.controlsDown=Lo(t,".navigate-down"),this.controlsPrev=Lo(t,".navigate-prev"),this.controlsNext=Lo(t,".navigate-next"),this.controlsRightArrow=this.element.querySelector(".navigate-right"),this.controlsLeftArrow=this.element.querySelector(".navigate-left"),this.controlsDownArrow=this.element.querySelector(".navigate-down")}},{key:"configure",value:function(e,t){this.element.style.display=e.controls?"block":"none",this.element.setAttribute("data-controls-layout",e.controlsLayout),this.element.setAttribute("data-controls-back-arrows",e.controlsBackArrows)}},{key:"bind",value:function(){var e=this,t=["touchstart","click"];Bo&&(t=["touchstart"]),t.forEach((function(t){e.controlsLeft.forEach((function(n){return n.addEventListener(t,e.onNavigateLeftClicked,!1)})),e.controlsRight.forEach((function(n){return n.addEventListener(t,e.onNavigateRightClicked,!1)})),e.controlsUp.forEach((function(n){return n.addEventListener(t,e.onNavigateUpClicked,!1)})),e.controlsDown.forEach((function(n){return n.addEventListener(t,e.onNavigateDownClicked,!1)})),e.controlsPrev.forEach((function(n){return n.addEventListener(t,e.onNavigatePrevClicked,!1)})),e.controlsNext.forEach((function(n){return n.addEventListener(t,e.onNavigateNextClicked,!1)}))}))}},{key:"unbind",value:function(){var e=this;["touchstart","click"].forEach((function(t){e.controlsLeft.forEach((function(n){return n.removeEventListener(t,e.onNavigateLeftClicked,!1)})),e.controlsRight.forEach((function(n){return n.removeEventListener(t,e.onNavigateRightClicked,!1)})),e.controlsUp.forEach((function(n){return n.removeEventListener(t,e.onNavigateUpClicked,!1)})),e.controlsDown.forEach((function(n){return n.removeEventListener(t,e.onNavigateDownClicked,!1)})),e.controlsPrev.forEach((function(n){return n.removeEventListener(t,e.onNavigatePrevClicked,!1)})),e.controlsNext.forEach((function(n){return n.removeEventListener(t,e.onNavigateNextClicked,!1)}))}))}},{key:"update",value:function(){var e=this.Reveal.availableRoutes();[].concat(uo(this.controlsLeft),uo(this.controlsRight),uo(this.controlsUp),uo(this.controlsDown),uo(this.controlsPrev),uo(this.controlsNext)).forEach((function(e){e.classList.remove("enabled","fragmented"),e.setAttribute("disabled","disabled")})),e.left&&this.controlsLeft.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")})),e.right&&this.controlsRight.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")})),e.up&&this.controlsUp.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")})),e.down&&this.controlsDown.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")})),(e.left||e.up)&&this.controlsPrev.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")})),(e.right||e.down)&&this.controlsNext.forEach((function(e){e.classList.add("enabled"),e.removeAttribute("disabled")}));var t=this.Reveal.getCurrentSlide();if(t){var 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e(t){io(this,e),this.Reveal=t,this.onProgressClicked=this.onProgressClicked.bind(this)}return ao(e,[{key:"render",value:function(){this.element=document.createElement("div"),this.element.className="progress",this.Reveal.getRevealElement().appendChild(this.element),this.bar=document.createElement("span"),this.element.appendChild(this.bar)}},{key:"configure",value:function(e,t){this.element.style.display=e.progress?"block":"none"}},{key:"bind",value:function(){this.Reveal.getConfig().progress&&this.element&&this.element.addEventListener("click",this.onProgressClicked,!1)}},{key:"unbind",value:function(){this.Reveal.getConfig().progress&&this.element&&this.element.removeEventListener("click",this.onProgressClicked,!1)}},{key:"update",value:function(){if(this.Reveal.getConfig().progress&&this.bar){var e=this.Reveal.getProgress();this.Reveal.getTotalSlides()<2&&(e=0),this.bar.style.transform="scaleX("+e+")"}}},{key:"getMaxWidth",value:function(){return this.Reveal.getRevealElement().offsetWidth}},{key:"onProgressClicked",value:function(e){this.Reveal.onUserInput(e),e.preventDefault();var t=this.Reveal.getSlides(),n=t.length,i=Math.floor(e.clientX/this.getMaxWidth()*n);this.Reveal.getConfig().rtl&&(i=n-i);var r=this.Reveal.getIndices(t[i]);this.Reveal.slide(r.h,r.v)}}]),e}(),gs=function(){function e(t){io(this,e),this.Reveal=t,this.lastMouseWheelStep=0,this.cursorHidden=!1,this.cursorInactiveTimeout=0,this.onDocumentCursorActive=this.onDocumentCursorActive.bind(this),this.onDocumentMouseScroll=this.onDocumentMouseScroll.bind(this)}return ao(e,[{key:"configure",value:function(e,t){e.mouseWheel?(document.addEventListener("DOMMouseScroll",this.onDocumentMouseScroll,!1),document.addEventListener("mousewheel",this.onDocumentMouseScroll,!1)):(document.removeEventListener("DOMMouseScroll",this.onDocumentMouseScroll,!1),document.removeEventListener("mousewheel",this.onDocumentMouseScroll,!1)),e.hideInactiveCursor?(document.addEventListener("mousemove",this.onDocumentCursorActive,!1),document.addEventListener("mousedown",this.onDocumentCursorActive,!1)):(this.showCursor(),document.removeEventListener("mousemove",this.onDocumentCursorActive,!1),document.removeEventListener("mousedown",this.onDocumentCursorActive,!1))}},{key:"showCursor",value:function(){this.cursorHidden&&(this.cursorHidden=!1,this.Reveal.getRevealElement().style.cursor="")}},{key:"hideCursor",value:function(){!1===this.cursorHidden&&(this.cursorHidden=!0,this.Reveal.getRevealElement().style.cursor="none")}},{key:"onDocumentCursorActive",value:function(e){this.showCursor(),clearTimeout(this.cursorInactiveTimeout),this.cursorInactiveTimeout=setTimeout(this.hideCursor.bind(this),this.Reveal.getConfig().hideCursorTime)}},{key:"onDocumentMouseScroll",value:function(e){if(Date.now()-this.lastMouseWheelStep>1e3){this.lastMouseWheelStep=Date.now();var 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n=this;return this.state="loading",e.forEach(this.registerPlugin.bind(this)),new Promise((function(e){var i=[],r=0;if(t.forEach((function(e){e.condition&&!e.condition()||(e.async?n.asyncDependencies.push(e):i.push(e))})),i.length){r=i.length;var a=function(t){t&&"function"==typeof t.callback&&t.callback(),0==--r&&n.initPlugins().then(e)};i.forEach((function(e){"string"==typeof e.id?(n.registerPlugin(e),a(e)):"string"==typeof e.src?bs(e.src,(function(){return a(e)})):(console.warn("Unrecognized plugin format",e),a())}))}else n.initPlugins().then(e)}))}},{key:"initPlugins",value:function(){var e=this;return new Promise((function(t){var n=Object.values(e.registeredPlugins),i=n.length;if(0===i)e.loadAsync().then(t);else{var r,a=function(){0==--i?e.loadAsync().then(t):r()},o=0;(r=function(){var t=n[o++];if("function"==typeof t.init){var i=t.init(e.Reveal);i&&"function"==typeof i.then?i.then(a):a()}else a()})()}}))}},{key:"loadAsync",value:function(){return 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e=this.Reveal.getConfig(),t=this.Reveal.getComputedSlideSize(window.innerWidth,window.innerHeight),n=Math.floor(t.width*(1+e.margin)),i=Math.floor(t.height*(1+e.margin)),r=t.width,a=t.height;To("@page{size:"+n+"px "+i+"px; margin: 0px;}"),To(".reveal section>img, .reveal section>video, .reveal section>iframe{max-width: "+r+"px; max-height:"+a+"px}"),document.documentElement.classList.add("print-pdf"),document.body.style.width=n+"px",document.body.style.height=i+"px",this.Reveal.layoutSlideContents(r,a);var o=e.slideNumber&&/all|print/i.test(e.showSlideNumber);Lo(this.Reveal.getRevealElement(),go).forEach((function(e){e.setAttribute("data-slide-number",this.Reveal.slideNumber.getSlideNumber(e))}),this),Lo(this.Reveal.getRevealElement(),go).forEach((function(t){if(!1===t.classList.contains("stack")){var s=(n-r)/2,l=(i-a)/2;this.Reveal.slideContent.layout(t);var 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g=document.createElement("div");g.classList.add("slide-number"),g.classList.add("slide-number-pdf"),g.innerHTML=t.getAttribute("data-slide-number"),d.appendChild(g)}if(e.pdfSeparateFragments){var p,m,y=this.Reveal.fragments.sort(d.querySelectorAll(".fragment"),!0);y.forEach((function(e){p&&p.forEach((function(e){e.classList.remove("current-fragment")})),e.forEach((function(e){e.classList.add("visible","current-fragment")}),this);var t=d.cloneNode(!0);d.parentNode.insertBefore(t,(m||d).nextSibling),p=e,m=t}),this),y.forEach((function(e){e.forEach((function(e){e.classList.remove("visible","current-fragment")}))}))}else Lo(d,".fragment:not(.fade-out)").forEach((function(e){e.classList.add("visible")}))}}),this),this.Reveal.dispatchEvent({type:"pdf-ready"})}},{key:"isPrintingPDF",value:function(){return/print-pdf/gi.test(window.location.search)}}]),e}(),Es=function(){function e(t){io(this,e),this.Reveal=t,this.touchStartX=0,this.touchStartY=0,this.touchStartCount=0,this.touchCaptured=!1,this.onPointerDown=this.onPointerDown.bind(this),this.onPointerMove=this.onPointerMove.bind(this),this.onPointerUp=this.onPointerUp.bind(this),this.onTouchStart=this.onTouchStart.bind(this),this.onTouchMove=this.onTouchMove.bind(this),this.onTouchEnd=this.onTouchEnd.bind(this)}return ao(e,[{key:"bind",value:function(){var e=this.Reveal.getRevealElement();"onpointerdown"in 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r=this.Reveal.availableRoutes({includeFragments:!0}),a=n-this.touchStartX,o=i-this.touchStartY;a>40&&Math.abs(a)>Math.abs(o)?(this.touchCaptured=!0,"linear"===t.navigationMode?t.rtl?this.Reveal.next():this.Reveal.prev():this.Reveal.left()):a<-40&&Math.abs(a)>Math.abs(o)?(this.touchCaptured=!0,"linear"===t.navigationMode?t.rtl?this.Reveal.prev():this.Reveal.next():this.Reveal.right()):o>40&&r.up?(this.touchCaptured=!0,"linear"===t.navigationMode?this.Reveal.prev():this.Reveal.up()):o<-40&&r.down&&(this.touchCaptured=!0,"linear"===t.navigationMode?this.Reveal.next():this.Reveal.down()),t.embedded?(this.touchCaptured||this.Reveal.isVerticalSlide())&&e.preventDefault():e.preventDefault()}}}},{key:"onTouchEnd",value:function(e){this.touchCaptured=!1}},{key:"onPointerDown",value:function(e){e.pointerType!==e.MSPOINTER_TYPE_TOUCH&&"touch"!==e.pointerType||(e.touches=[{clientX:e.clientX,clientY:e.clientY}],this.onTouchStart(e))}},{key:"onPointerMove",value:function(e){e.pointerType!==e.MSPOINTER_TYPE_TOUCH&&"touch"!==e.pointerType||(e.touches=[{clientX:e.clientX,clientY:e.clientY}],this.onTouchMove(e))}},{key:"onPointerUp",value:function(e){e.pointerType!==e.MSPOINTER_TYPE_TOUCH&&"touch"!==e.pointerType||(e.touches=[{clientX:e.clientX,clientY:e.clientY}],this.onTouchEnd(e))}}]),e}(),ks="focus",As="blur",Rs=function(){function 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ao(e,[{key:"configure",value:function(e,t){e.embedded?this.blur():(this.focus(),this.unbind())}},{key:"bind",value:function(){this.Reveal.getConfig().embedded&&this.Reveal.getRevealElement().addEventListener("pointerdown",this.onRevealPointerDown,!1)}},{key:"unbind",value:function(){this.Reveal.getRevealElement().removeEventListener("pointerdown",this.onRevealPointerDown,!1),document.removeEventListener("pointerdown",this.onDocumentPointerDown,!1)}},{key:"focus",value:function(){this.state!==ks&&(this.Reveal.getRevealElement().classList.add("focused"),document.addEventListener("pointerdown",this.onDocumentPointerDown,!1)),this.state=ks}},{key:"blur",value:function(){this.state!==As&&(this.Reveal.getRevealElement().classList.remove("focused"),document.removeEventListener("pointerdown",this.onDocumentPointerDown,!1)),this.state=As}},{key:"isFocused",value:function(){return this.state===ks}},{key:"onRevealPointerDown",value:function(e){this.focus()}},{key:"onDocumentPointerDown",value:function(e){var t=Io(e.target,".reveal");t&&t===this.Reveal.getRevealElement()||this.blur()}}]),e}(),xs=function(){function e(t){io(this,e),this.Reveal=t}return ao(e,[{key:"render",value:function(){this.element=document.createElement("div"),this.element.className="speaker-notes",this.element.setAttribute("data-prevent-swipe",""),this.element.setAttribute("tabindex","0"),this.Reveal.getRevealElement().appendChild(this.element)}},{key:"configure",value:function(e,t){e.showNotes&&this.element.setAttribute("data-layout","string"==typeof e.showNotes?e.showNotes:"inline")}},{key:"update",value:function(){this.Reveal.getConfig().showNotes&&this.element&&this.Reveal.getCurrentSlide()&&!this.Reveal.print.isPrintingPDF()&&(this.element.innerHTML=this.getSlideNotes()||'<span class="notes-placeholder">No notes on this slide.</span>')}},{key:"updateVisibility",value:function(){this.Reveal.getConfig().showNotes&&this.hasNotes()&&!this.Reveal.print.isPrintingPDF()?this.Reveal.getRevealElement().classList.add("show-notes"):this.Reveal.getRevealElement().classList.remove("show-notes")}},{key:"hasNotes",value:function(){return this.Reveal.getSlidesElement().querySelectorAll("[data-notes], aside.notes").length>0}},{key:"isSpeakerNotesWindow",value:function(){return!!window.location.search.match(/receiver/gi)}},{key:"getSlideNotes",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.Reveal.getCurrentSlide();if(e.hasAttribute("data-notes"))return e.getAttribute("data-notes");var t=e.querySelector("aside.notes");return t?t.innerHTML:null}}]),e}(),Ls=qe("unscopables"),Cs=Array.prototype;null==Cs[Ls]&&P.f(Cs,Ls,{configurable:!0,value:It(null)});Oe({target:"Array",proto:!0},{fill:function(e){for(var t=De(this),n=de(t.length),i=arguments.length,r=ve(i>1?arguments[1]:void 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Ge(){(R.isActive()||!1===A.prev())&&Ce().up&&Se(n,i-1)}function Je(){u.hasNavigatedVertically=!0,(R.isActive()||!1===A.next())&&Ce().down&&Se(n,i+1)}function Qe(){var e;if(!1===A.prev())if(Ce().up)Ge();else if(e=l.rtl?Co(v.wrapper,".slides>section.future").pop():Co(v.wrapper,".slides>section.past").pop()){var t=e.querySelectorAll("section").length-1||void 0;Se(n-1,t)}}function Ze(){if(u.hasNavigatedHorizontally=!0,u.hasNavigatedVertically=!0,!1===A.next()){var e=Ce();e.down&&e.right&&l.loop&&he()&&(e.down=!1),e.down?Je():l.rtl?Xe():Ye()}}function et(e){l.autoSlideStoppable&&Ke()}function tt(e){"running"===p&&/section/gi.test(e.target.nodeName)&&(p="idle",Q({type:"slidetransitionend",data:{indexh:n,indexv:i,previousSlide:r,currentSlide:a}}))}function nt(e){oe()}function it(e){!1===document.hidden&&document.activeElement!==document.body&&("function"==typeof document.activeElement.blur&&document.activeElement.blur(),document.body.focus())}function 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ot={VERSION:Is,initialize:D,configure:K,sync:Ee,syncSlide:ke,syncFragments:A.sync.bind(A),slide:Se,left:Xe,right:Ye,up:Ge,down:Je,prev:Qe,next:Ze,navigateLeft:Xe,navigateRight:Ye,navigateUp:Ge,navigateDown:Je,navigatePrev:Qe,navigateNext:Ze,navigateFragment:A.goto.bind(A),prevFragment:A.prev.bind(A),nextFragment:A.next.bind(A),on:Y,off:G,addEventListener:Y,removeEventListener:G,layout:oe,shuffle:Re,availableRoutes:Ce,availableFragments:A.availableRoutes.bind(A),toggleHelp:ie,toggleOverview:R.toggle.bind(R),togglePause:me,toggleAutoSlide:be,isFirstSlide:fe,isLastSlide:ve,isLastVerticalSlide:he,isVerticalSlide:de,isPaused:ye,isAutoSliding:we,isSpeakerNotes:j.isSpeakerNotesWindow.bind(j),isOverview:R.isActive.bind(R),isFocused:O.isFocused.bind(O),isPrintingPDF:I.isPrintingPDF.bind(I),isReady:function(){return c},loadSlide:w.load.bind(w),unloadSlide:w.unload.bind(w),showPreview:ne,hidePreview:ae,addEventListeners:$,removeEventListeners:X,dispatchEvent:Q,getState:Be,setState:qe,getProgress:Ne,getIndices:Me,getSlidesAttributes:ze,getSlidePastCount:Pe,getTotalSlides:He,getSlide:Ue,getPreviousSlide:function(){return r},getCurrentSlide:function(){return a},getSlideBackground:_e,getSlideNotes:j.getSlideNotes.bind(j),getSlides:Ie,getHorizontalSlides:Oe,getVerticalSlides:Te,hasHorizontalSlides:De,hasVerticalSlides:Fe,hasNavigatedHorizontally:function(){return u.hasNavigatedHorizontally},hasNavigatedVertically:function(){return u.hasNavigatedVertically},addKeyBinding:x.addKeyBinding.bind(x),removeKeyBinding:x.removeKeyBinding.bind(x),triggerKey:x.triggerKey.bind(x),registerKeyboardShortcut:x.registerKeyboardShortcut.bind(x),getComputedSlideSize:le,getScale:function(){return h},getConfig:function(){return l},getQueryHash:Do,getRevealElement:function(){return e},getSlidesElement:function(){return v.slides},getViewportElement:function(){return v.viewport},getBackgroundsElement:function(){return k.element},registerPlugin:M.registerPlugin.bind(M),hasPlugin:M.hasPlugin.bind(M),getPlugin:M.getPlugin.bind(M),getPlugins:M.getRegisteredPlugins.bind(M)};return Lo(s,co(co({},ot),{},{announceStatus:B,getStatusText:q,print:I,focus:O,progress:P,controls:C,location:L,overview:R,fragments:A,slideContent:w,slideNumber:S,onUserInput:et,closeOverlay:ae,updateSlidesVisibility:Le,layoutSlideContents:se,transformSlides:J,cueAutoSlide:We,cancelAutoSlide:Ve})),ot}var Ts=Os,js=[];return Ts.initialize=function(e){return Object.assign(Ts,new Os(document.querySelector(".reveal"),e)),js.map((function(e){return e(Ts)})),Ts.initialize()},["configure","on","off","addEventListener","removeEventListener","registerPlugin"].forEach((function(e){Ts[e]=function(){for(var t=arguments.length,n=new Array(t),i=0;i<t;i++)n[i]=arguments[i];js.push((function(t){var i;return(i=t[e]).call.apply(i,[null].concat(n))}))}})),Ts.isReady=function(){return!1},Ts.VERSION=Is,Ts}));
 //# sourceMappingURL=reveal.js.map
diff --git a/js/controllers/backgrounds.js b/js/controllers/backgrounds.js
index 0e58df57..f412a182 100644
--- a/js/controllers/backgrounds.js
+++ b/js/controllers/backgrounds.js
@@ -27,8 +27,6 @@ export default class Backgrounds {
 	 */
 	create() {
 
-		let printMode = this.Reveal.isPrintingPDF();
-
 		// Clear prior backgrounds
 		this.element.innerHTML = '';
 		this.element.classList.add( 'no-transition' );
@@ -114,9 +112,24 @@ export default class Backgrounds {
 	 */
 	sync( slide ) {
 
-		let element = slide.slideBackgroundElement,
+		const element = slide.slideBackgroundElement,
 			contentElement = slide.slideBackgroundContentElement;
 
+		const 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' ),
+			backgroundOpacity: slide.getAttribute( 'data-background-opacity' ),
+		};
+
+		const dataPreload = slide.hasAttribute( 'data-preload' );
+
 		// Reset the prior background state in case this is not the
 		// initial sync
 		slide.classList.remove( 'has-dark-background' );
@@ -135,19 +148,6 @@ export default class Backgrounds {
 		contentElement.style.opacity = '';
 		contentElement.innerHTML = '';
 
-		let 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' ),
-			backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
-		};
-
 		if( data.background ) {
 			// Auto-wrap image urls in url(...)
 			if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
@@ -179,7 +179,7 @@ export default class Backgrounds {
 		if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
 		if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
 
-		if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
+		if( dataPreload ) element.setAttribute( 'data-preload', '' );
 
 		// Background image options are set on the content wrapper
 		if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
@@ -201,7 +201,7 @@ export default class Backgrounds {
 		}
 
 		if( contrastColor ) {
-			let rgb = colorToRgb( contrastColor );
+			const rgb = colorToRgb( contrastColor );
 
 			// Ignore fully transparent backgrounds. Some browsers return
 			// rgba(0,0,0,0) when reading the computed background color of
@@ -394,4 +394,4 @@ export default class Backgrounds {
 
 	}
 
-}
\ No newline at end of file
+}
diff --git a/js/controllers/print.js b/js/controllers/print.js
index 9d7cba6b..5bedeae7 100644
--- a/js/controllers/print.js
+++ b/js/controllers/print.js
@@ -16,20 +16,26 @@ export default class Print {
 	 * Configures the presentation for printing to a static
 	 * PDF.
 	 */
-	setupPDF() {
+	async setupPDF() {
 
-		let config = this.Reveal.getConfig();
+		const config = this.Reveal.getConfig();
+		const slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )
 
-		let slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+		// Compute slide numbers now, before we start duplicating slides
+		const doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+
+		const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
 
 		// Dimensions of the PDF pages
-		let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+		const pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
 			pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
 
 		// Dimensions of slides within the pages
-		let slideWidth = slideSize.width,
+		const slideWidth = slideSize.width,
 			slideHeight = slideSize.height;
 
+		await new Promise( requestAnimationFrame );
+
 		// Let the browser know what page size we want to print
 		createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
 
@@ -41,29 +47,32 @@ export default class Print {
 		document.body.style.height = pageHeight + 'px';
 
 		// Make sure stretch elements fit on slide
+		await new Promise( requestAnimationFrame );
 		this.Reveal.layoutSlideContents( slideWidth, slideHeight );
 
-		// Compute slide numbers now, before we start duplicating slides
-		let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
-		queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( function( slide ) {
-			slide.setAttribute( 'data-slide-number', this.Reveal.slideNumber.getSlideNumber( slide ) );
-		}, this );
+		// Re-run the slide layout so that r-fit-text is applied based on
+		// the printed slide size
+		slides.forEach( slide => this.Reveal.slideContent.layout( slide ) );
+
+		// Batch scrollHeight access to prevent layout thrashing
+		await new Promise( requestAnimationFrame );
+
+		const slideScrollHeights = slides.map( slide => slide.scrollHeight );
+
+		const pages = [];
+		const pageContainer = slides[0].parentNode;
 
 		// Slide and slide background layout
-		queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( function( slide ) {
+		slides.forEach( function( slide, index ) {
 
 			// 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
-				let left = ( pageWidth - slideWidth ) / 2,
-					top = ( pageHeight - slideHeight ) / 2;
+				let left = ( pageWidth - slideWidth ) / 2;
+				let top = ( pageHeight - slideHeight ) / 2;
 
-				// Re-run the slide layout so that r-fit-text is applied based on
-				// the printed slide size
-				this.Reveal.slideContent.layout( slide );
-
-				let contentHeight = slide.scrollHeight;
+				const contentHeight = slideScrollHeights[ index ];
 				let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
 
 				// Adhere to configured pages per slide limit
@@ -76,10 +85,11 @@ export default class Print {
 
 				// Wrap the slide in a page element and hide its overflow
 				// so that no page ever flows onto another
-				let page = document.createElement( 'div' );
+				const page = document.createElement( 'div' );
+				pages.push( page );
+
 				page.className = 'pdf-page';
 				page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
-				slide.parentNode.insertBefore( page, slide );
 				page.appendChild( slide );
 
 				// Position the slide inside of the page
@@ -95,19 +105,19 @@ export default class Print {
 				if( config.showNotes ) {
 
 					// Are there notes for this slide?
-					let notes = this.Reveal.getSlideNotes( slide );
+					const notes = this.Reveal.getSlideNotes( slide );
 					if( notes ) {
 
-						let notesSpacing = 8;
-						let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
-						let notesElement = document.createElement( 'div' );
+						const notesSpacing = 8;
+						const notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+						const notesElement = document.createElement( 'div' );
 						notesElement.classList.add( 'speaker-notes' );
 						notesElement.classList.add( 'speaker-notes-pdf' );
 						notesElement.setAttribute( 'data-layout', notesLayout );
 						notesElement.innerHTML = notes;
 
 						if( notesLayout === 'separate-page' ) {
-							page.parentNode.insertBefore( notesElement, page.nextSibling );
+							pages.push( notesElement );
 						}
 						else {
 							notesElement.style.left = notesSpacing + 'px';
@@ -122,10 +132,11 @@ export default class Print {
 
 				// Inject slide numbers if `slideNumbers` are enabled
 				if( doingSlideNumbers ) {
-					let numberElement = document.createElement( 'div' );
+					const slideNumber = index + 1;
+					const numberElement = document.createElement( 'div' );
 					numberElement.classList.add( 'slide-number' );
 					numberElement.classList.add( 'slide-number-pdf' );
-					numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
+					numberElement.innerHTML = slideNumber;
 					page.appendChild( numberElement );
 				}
 
@@ -135,10 +146,9 @@ export default class Print {
 					// Each fragment 'group' is an array containing one or more
 					// fragments. Multiple fragments that appear at the same time
 					// are part of the same group.
-					let fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
+					const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
 
 					let previousFragmentStep;
-					let previousPage;
 
 					fragmentGroups.forEach( function( fragments ) {
 
@@ -155,11 +165,10 @@ export default class Print {
 						}, this );
 
 						// Create a separate page for the current fragment state
-						let clonedPage = page.cloneNode( true );
-						page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
+						const clonedPage = page.cloneNode( true );
+						pages.push( clonedPage );
 
 						previousFragmentStep = fragments;
-						previousPage = clonedPage;
 
 					}, this );
 
@@ -182,6 +191,10 @@ export default class Print {
 
 		}, this );
 
+		await new Promise( requestAnimationFrame );
+
+		pages.forEach( page => pageContainer.appendChild( page ) );
+
 		// Notify subscribers that the PDF layout is good to go
 		this.Reveal.dispatchEvent({ type: 'pdf-ready' });
 
@@ -196,4 +209,4 @@ export default class Print {
 
 	}
 
-}
\ No newline at end of file
+}
diff --git a/js/reveal.js b/js/reveal.js
index c72bd8ab..40e7ecd5 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1335,7 +1335,11 @@ export default function( revealElement, options ) {
 		}
 
 		// Announce the current slide contents to screen readers
-		announceStatus( getStatusText( currentSlide ) );
+		// Use animation frame to prevent getComputedStyle in getStatusText
+		// from triggering layout mid-frame
+		requestAnimationFrame( () => {
+			announceStatus( getStatusText( currentSlide ) );
+		});
 
 		progress.update();
 		controls.update();
@@ -2290,7 +2294,7 @@ export default function( revealElement, options ) {
 			// When looping is enabled `routes.down` is always available
 			// so we need a separate check for when we've reached the
 			// end of a stack and should move horizontally
-			if( routes.down && routes.right && config.loop && isLastVerticalSlide( currentSlide ) ) {
+			if( routes.down && routes.right && config.loop && isLastVerticalSlide() ) {
 				routes.down = false;
 			}