diff --git a/css/print/pdf.scss b/css/print/pdf.scss
index 2f6974c..96b774d 100644
--- a/css/print/pdf.scss
+++ b/css/print/pdf.scss
@@ -164,4 +164,9 @@ html.print-pdf {
 		position: absolute;
 		font-size: 14px;
 	}
+
+	/* This accessibility tool is not useful in PDF and breaks it visually */
+	.aria-status {
+		display: none;
+	}
 }
diff --git a/dist/print/pdf.css b/dist/print/pdf.css
index e989b5d..7c6bba1 100644
--- a/dist/print/pdf.css
+++ b/dist/print/pdf.css
@@ -9,7 +9,8 @@ html.print-pdf {
   /* Slide backgrounds are placed inside of their slide when exporting to PDF */
   /* Display slide speaker notes when 'showNotes' is enabled */
   /* Layout option which makes notes appear on a separate page */
-  /* Display slide numbers when 'slideNumber' is enabled */ }
+  /* Display slide numbers when 'slideNumber' is enabled */
+  /* This accessibility tool is not useful in PDF and breaks it visually */ }
   html.print-pdf * {
     -webkit-print-color-adjust: exact; }
   html.print-pdf {
@@ -122,3 +123,5 @@ html.print-pdf {
     display: block;
     position: absolute;
     font-size: 14px; }
+  html.print-pdf .aria-status {
+    display: none; }
diff --git a/dist/reveal.css b/dist/reveal.css
index e24d533..a5c7d8c 100644
--- a/dist/reveal.css
+++ b/dist/reveal.css
@@ -1,5 +1,5 @@
 /*!
-* reveal.js 4.0.0-dev (Wed Mar 11 2020)
+* reveal.js 4.0.0-dev (Thu Mar 12 2020)
 * https://revealjs.com
 * MIT licensed
 *
diff --git a/dist/reveal.min.js b/dist/reveal.min.js
index 27564e2..91d4f24 100644
--- a/dist/reveal.min.js
+++ b/dist/reveal.min.js
@@ -5,4 +5,4 @@
 *
 * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
 */
-!function(e){var t={};function i(a){if(t[a])return t[a].exports;var n=t[a]={i:a,l:!1,exports:{}};return e[a].call(n.exports,n,n.exports,i),n.l=!0,n.exports}i.m=e,i.c=t,i.d=function(e,t,a){i.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:a})},i.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},i.t=function(e,t){if(1&t&&(e=i(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var a=Object.create(null);if(i.r(a),Object.defineProperty(a,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var n in e)i.d(a,n,function(t){return e[t]}.bind(null,n));return a},i.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return i.d(t,"a",t),t},i.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},i.p="",i(i.s=0)}([function(e,t,i){"use strict";i.r(t);const a=/registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener/,n=(e,t)=>{for(let i in t)e[i]=t[i];return e},s=e=>Array.prototype.slice.call(e),r=e=>{if("string"==typeof e){if("null"===e)return null;if("true"===e)return!0;if("false"===e)return!1;if(e.match(/^-?[\d\.]+$/))return parseFloat(e)}return e},o=(e,t)=>{e.style.transform=t},l=(e,t)=>{let i=e.parentNode;for(;i;){let e=i.matches||i.matchesSelector||i.msMatchesSelector;if(e&&e.call(i,t))return i;i=i.parentNode}return null},d=(e,t,i,a="")=>{let n=e.querySelectorAll("."+i);for(let t=0;t<n.length;t++){let i=n[t];if(i.parentNode===e)return i}let s=document.createElement(t);return s.className=i,s.innerHTML=a,e.appendChild(s),s},c=e=>{let t=document.createElement("style");return t.type="text/css",e&&e.length>0&&(t.styleSheet?t.styleSheet.cssText=e:t.appendChild(document.createTextNode(e))),document.head.appendChild(t),t},u=()=>{let e={};location.search.replace(/[A-Z0-9]+?=([\w\.%-]*)/gi,t=>{e[t.split("=").shift()]=t.split("=").pop()});for(let t in e){let i=e[t];e[t]=r(unescape(i))}return void 0!==e.dependencies&&delete e.dependencies,e},h=navigator.userAgent,g=document.createElement("div"),p=/(iphone|ipod|ipad|android)/gi.test(h)||"MacIntel"===navigator.platform&&navigator.maxTouchPoints>1,v=/chrome/i.test(h)&&!/edge/i.test(h),f=/android/gi.test(h),m="zoom"in g.style&&!p&&(v||/Version\/[\d\.]+.*Safari/.test(h));class b{constructor(e){this.Reveal=e}shouldPreload(e){let t=this.Reveal.getConfig().preloadIframes;return"boolean"!=typeof t&&(t=e.hasAttribute("data-preload")),t}load(e,t={}){e.style.display=this.Reveal.getConfig().display,s(e.querySelectorAll("img[data-src], video[data-src], audio[data-src], iframe[data-src]")).forEach(e=>{("IFRAME"!==e.tagName||this.shouldPreload(e))&&(e.setAttribute("src",e.getAttribute("data-src")),e.setAttribute("data-lazy-loaded",""),e.removeAttribute("data-src"))}),s(e.querySelectorAll("video, audio")).forEach(e=>{let t=0;s(e.querySelectorAll("source[data-src]")).forEach(e=>{e.setAttribute("src",e.getAttribute("data-src")),e.removeAttribute("data-src"),e.setAttribute("data-lazy-loaded",""),t+=1}),t>0&&e.load()});let i=e.slideBackgroundElement;if(i){i.style.display="block";let a=e.slideBackgroundContentElement,n=e.getAttribute("data-background-iframe");if(!1===i.hasAttribute("data-loaded")){i.setAttribute("data-loaded","true");let s=e.getAttribute("data-background-image"),r=e.getAttribute("data-background-video"),o=e.hasAttribute("data-background-video-loop"),l=e.hasAttribute("data-background-video-muted");if(s)a.style.backgroundImage="url("+encodeURI(s)+")";else if(r&&!this.Reveal.isSpeakerNotes()){let e=document.createElement("video");o&&e.setAttribute("loop",""),l&&(e.muted=!0),p&&(e.muted=!0,e.autoplay=!0,e.setAttribute("playsinline","")),r.split(",").forEach(t=>{e.innerHTML+='<source src="'+t+'">'}),a.appendChild(e)}else if(n&&!0!==t.excludeIframes){let e=document.createElement("iframe");e.setAttribute("allowfullscreen",""),e.setAttribute("mozallowfullscreen",""),e.setAttribute("webkitallowfullscreen",""),e.setAttribute("allow","autoplay"),e.setAttribute("data-src",n),e.style.width="100%",e.style.height="100%",e.style.maxHeight="100%",e.style.maxWidth="100%",a.appendChild(e)}}let s=a.querySelector("iframe[data-src]");s&&this.shouldPreload(i)&&!/autoplay=(1|true|yes)/gi.test(n)&&s.getAttribute("src")!==n&&s.setAttribute("src",n)}}unload(e){e.style.display="none";let t=this.Reveal.getSlideBackground(e);t&&(t.style.display="none",s(t.querySelectorAll("iframe[src]")).forEach(e=>{e.removeAttribute("src")})),s(e.querySelectorAll("video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]")).forEach(e=>{e.setAttribute("data-src",e.getAttribute("src")),e.removeAttribute("src")}),s(e.querySelectorAll("video[data-lazy-loaded] source[src], audio source[src]")).forEach(e=>{e.setAttribute("data-src",e.getAttribute("src")),e.removeAttribute("src")})}formatEmbeddedContent(){let e=(e,t,i)=>{s(this.Reveal.getSlidesElement().querySelectorAll("iframe["+e+'*="'+t+'"]')).forEach(t=>{let a=t.getAttribute(e);a&&-1===a.indexOf(i)&&t.setAttribute(e,a+(/\?/.test(a)?"&":"?")+i)})};e("src","youtube.com/embed/","enablejsapi=1"),e("data-src","youtube.com/embed/","enablejsapi=1"),e("src","player.vimeo.com/","api=1"),e("data-src","player.vimeo.com/","api=1")}startEmbeddedContent(e){e&&!this.Reveal.isSpeakerNotes()&&(s(e.querySelectorAll('img[src$=".gif"]')).forEach(e=>{e.setAttribute("src",e.getAttribute("src"))}),s(e.querySelectorAll("video, audio")).forEach(e=>{if(l(e,".fragment")&&!l(e,".fragment.visible"))return;let t=this.Reveal.getConfig().autoPlayMedia;if("boolean"!=typeof t&&(t=e.hasAttribute("data-autoplay")||!!l(e,".slide-background")),t&&"function"==typeof e.play)if(e.readyState>1)this.startEmbeddedMedia({target:e});else if(p){let t=e.play();t&&"function"==typeof t.catch&&!1===e.controls&&t.catch(()=>{e.controls=!0,e.addEventListener("play",()=>{e.controls=!1})})}else e.removeEventListener("loadeddata",this.startEmbeddedMedia),e.addEventListener("loadeddata",this.startEmbeddedMedia)}),s(e.querySelectorAll("iframe[src]")).forEach(e=>{l(e,".fragment")&&!l(e,".fragment.visible")||this.startEmbeddedIframe({target:e})}),s(e.querySelectorAll("iframe[data-src]")).forEach(e=>{l(e,".fragment")&&!l(e,".fragment.visible")||e.getAttribute("src")!==e.getAttribute("data-src")&&(e.removeEventListener("load",this.startEmbeddedIframe),e.addEventListener("load",this.startEmbeddedIframe),e.setAttribute("src",e.getAttribute("data-src")))}))}startEmbeddedMedia(e){let t=!!l(e.target,"html"),i=!!l(e.target,".present");t&&i&&(e.target.currentTime=0,e.target.play()),e.target.removeEventListener("loadeddata",this.startEmbeddedMedia)}startEmbeddedIframe(e){let t=e.target;if(t&&t.contentWindow){let i=!!l(e.target,"html"),a=!!l(e.target,".present");if(i&&a){let e=this.Reveal.getConfig().autoPlayMedia;"boolean"!=typeof e&&(e=t.hasAttribute("data-autoplay")||!!l(t,".slide-background")),/youtube\.com\/embed\//.test(t.getAttribute("src"))&&e?t.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}',"*"):/player\.vimeo\.com\//.test(t.getAttribute("src"))&&e?t.contentWindow.postMessage('{"method":"play"}',"*"):t.contentWindow.postMessage("slide:start","*")}}}stopEmbeddedContent(e,t={}){t=n({unloadIframes:!0},t),e&&e.parentNode&&(s(e.querySelectorAll("video, audio")).forEach(e=>{e.hasAttribute("data-ignore")||"function"!=typeof e.pause||(e.setAttribute("data-paused-by-reveal",""),e.pause())}),s(e.querySelectorAll("iframe")).forEach(e=>{e.contentWindow&&e.contentWindow.postMessage("slide:stop","*"),e.removeEventListener("load",this.startEmbeddedIframe)}),s(e.querySelectorAll('iframe[src*="youtube.com/embed/"]')).forEach(e=>{!e.hasAttribute("data-ignore")&&e.contentWindow&&"function"==typeof e.contentWindow.postMessage&&e.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}',"*")}),s(e.querySelectorAll('iframe[src*="player.vimeo.com/"]')).forEach(e=>{!e.hasAttribute("data-ignore")&&e.contentWindow&&"function"==typeof e.contentWindow.postMessage&&e.contentWindow.postMessage('{"method":"pause"}',"*")}),!0===t.unloadIframes&&s(e.querySelectorAll("iframe[data-src]")).forEach(e=>{e.setAttribute("src","about:blank"),e.removeAttribute("src")}))}}class y{constructor(e){this.Reveal=e}createElement(){this.element=document.createElement("div"),this.element.className="slide-number",this.Reveal.getRevealElement().appendChild(this.element)}refreshVisibility(){let e=this.Reveal.getConfig(),t="none";e.slideNumber&&!this.Reveal.isPrintingPDF()&&("all"===e.showSlideNumber||"speaker"===e.showSlideNumber&&this.Reveal.isSpeakerNotes())&&(t="block"),this.element.style.display=t}update(){this.Reveal.getConfig().slideNumber&&this.element&&(this.element.innerHTML=this.getSlideNumber())}getSlideNumber(e=this.Reveal.getCurrentSlide()){let t,i=this.Reveal.getConfig(),a="h.v";if("function"==typeof i.slideNumber)t=i.slideNumber(e);else switch("string"==typeof i.slideNumber&&(a=i.slideNumber),/c/.test(a)||1!==this.Reveal.getHorizontalSlides().length||(a="c"),t=[],a){case"c":t.push(this.Reveal.getSlidePastCount(e)+1);break;case"c/t":t.push(this.Reveal.getSlidePastCount(e)+1,"/",this.Reveal.getTotalSlides());break;default:let i=this.Reveal.getIndices(e);t.push(i.h+1);let n="h/v"===a?"/":".";this.Reveal.isVerticalSlide(e)&&t.push(n,i.v+1)}let n="#"+this.Reveal.location.getHash(e);return this.formatNumber(t[0],t[1],t[2],n)}formatNumber(e,t,i,a="#"+this.Reveal.location.getHash()){return"number"!=typeof i||isNaN(i)?`<a href="${a}">\n\t\t\t\t\t<span class="slide-number-a">${e}</span>\n\t\t\t\t\t</a>`:`<a href="${a}">\n\t\t\t\t\t<span class="slide-number-a">${e}</span>\n\t\t\t\t\t<span class="slide-number-delimiter">${t}</span>\n\t\t\t\t\t<span class="slide-number-b">${i}</span>\n\t\t\t\t\t</a>`}}class A{constructor(e){this.Reveal=e,this.autoAnimateCounter=0}run(e,t){if(this.reset(),e.hasAttribute("data-auto-animate")&&t.hasAttribute("data-auto-animate")){this.autoAnimateStyleSheet=this.autoAnimateStyleSheet||c();let i=this.getAutoAnimateOptions(t);e.dataset.autoAnimate="pending",t.dataset.autoAnimate="pending";let a=this.getAutoAnimatableElements(e,t).map(e=>this.getAutoAnimateCSS(e.from,e.to,e.options||{},i,this.autoAnimateCounter++));"false"!==t.dataset.autoAnimateUnmatched&&!0===this.Reveal.getConfig().autoAnimateUnmatched&&(this.getUnmatchedAutoAnimateElements(t).forEach(e=>{e.dataset.autoAnimateTarget="unmatched"}),a.push(`[data-auto-animate="running"] [data-auto-animate-target="unmatched"] { transition: opacity ${.8*i.duration}s ease ${.2*i.duration}s; }`)),this.autoAnimateStyleSheet.innerHTML=a.join(""),requestAnimationFrame(()=>{this.autoAnimateStyleSheet&&(getComputedStyle(this.autoAnimateStyleSheet).fontWeight,t.dataset.autoAnimate="running")}),this.Reveal.dispatchEvent("autoanimate",{fromSlide:e,toSlide:t,sheet:this.autoAnimateStyleSheet})}}reset(){s(this.Reveal.getRevealElement().querySelectorAll('[data-auto-animate]:not([data-auto-animate=""])')).forEach(e=>{e.dataset.autoAnimate=""}),s(this.Reveal.getRevealElement().querySelectorAll("[data-auto-animate-target]")).forEach(e=>{delete 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${t.y}px)`),n&&e.push(`scale(${t.scaleX}, ${t.scaleY})`),r.styles.transform=e.join(" "),r.styles["transform-origin"]="top left",o.styles.transform="none"}}for(let e in o.styles){const t=o.styles[e],i=r.styles[e];t===i?delete o.styles[e]:(!0===t.explicitValue&&(o.styles[e]=t.value),!0===i.explicitValue&&(r.styles[e]=i.value))}let l="",d=Object.keys(o.styles);if(d.length>0){r.styles.transition="none",o.styles.transition=`all ${s.duration}s ${s.easing} ${s.delay}s`,o.styles["transition-property"]=d.join(", "),o.styles["will-change"]=d.join(", "),l='[data-auto-animate-target="'+n+'"] {'+Object.keys(r.styles).map(e=>e+": "+r.styles[e]+" !important;").join("")+'}[data-auto-animate="running"] [data-auto-animate-target="'+n+'"] {'+Object.keys(o.styles).map(e=>e+": "+o.styles[e]+" !important;").join("")+"}"}return l}getAutoAnimateOptions(e,t){let i={easing:this.Reveal.getConfig().autoAnimateEasing,duration:this.Reveal.getConfig().autoAnimateDuration,delay:0};if(i=n(i,t),e.closest&&e.parentNode){let t=e.parentNode.closest("[data-auto-animate-target]");t&&(i=this.getAutoAnimateOptions(t,i))}return e.dataset.autoAnimateEasing&&(i.easing=e.dataset.autoAnimateEasing),e.dataset.autoAnimateDuration&&(i.duration=parseFloat(e.dataset.autoAnimateDuration)),e.dataset.autoAnimateDelay&&(i.delay=parseFloat(e.dataset.autoAnimateDelay)),i}getAutoAnimatableProperties(e,t,i){let a={styles:[]};if(!1!==i.translate||!1!==i.scale){let e;e="function"==typeof i.measure?i.measure(t):t.getBoundingClientRect(),a.x=e.x,a.y=e.y,a.width=e.width,a.height=e.height}const n=getComputedStyle(t);return(i.styles||this.Reveal.getConfig().autoAnimateStyles).forEach(t=>{let i;"string"==typeof t&&(t={property:t}),i=void 0!==t.from&&"from"===e?{value:t.from,explicitValue:!0}:void 0!==t.to&&"to"===e?{value:t.to,explicitValue:!0}:n[t.property],""!==i&&(a.styles[t.property]=i)}),a}getAutoAnimatableElements(e,t){let i=("function"==typeof this.Reveal.getConfig().autoAnimateMatcher?this.Reveal.getConfig().autoAnimateMatcher:this.getAutoAnimatePairs).call(this,e,t),a=[];return i.filter((e,t)=>{if(-1===a.indexOf(e.to))return a.push(e.to),!0})}getAutoAnimatePairs(e,t){let i=[];const a="h1, h2, h3, h4, h5, h6, p, li";return this.findAutoAnimateMatches(i,e,t,"[data-id]",e=>e.nodeName+":::"+e.getAttribute("data-id")),this.findAutoAnimateMatches(i,e,t,a,e=>e.nodeName+":::"+e.innerText),this.findAutoAnimateMatches(i,e,t,"img, video, iframe",e=>e.nodeName+":::"+(e.getAttribute("src")||e.getAttribute("data-src"))),this.findAutoAnimateMatches(i,e,t,"pre",e=>e.nodeName+":::"+e.innerText),i.forEach(e=>{e.from.matches(a)?e.options={scale:!1}:e.from.matches("pre")&&(e.options={scale:!1,styles:["width","height"]},this.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-code",e=>e.textContent,{scale:!1,styles:[],measure:this.getLocalBoundingBox.bind(this)}),this.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-line[data-line-number]",e=>e.getAttribute("data-line-number"),{scale:!1,styles:["width"],measure:this.getLocalBoundingBox.bind(this)}))},this),i}getLocalBoundingBox(e){const 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}}findAutoAnimateMatches(e,t,i,a,n,s){let r={},o={};[].slice.call(t.querySelectorAll(a)).forEach((e,t)=>{const i=n(e);"string"==typeof i&&i.length&&(r[i]=r[i]||[],r[i].push(e))}),[].slice.call(i.querySelectorAll(a)).forEach((t,i)=>{const a=n(t);let l;if(o[a]=o[a]||[],o[a].push(t),r[a]){const e=o[a].length-1,t=r[a].length-1;r[a][e]?(l=r[a][e],r[a][e]=null):r[a][t]&&(l=r[a][t],r[a][t]=null)}l&&e.push({from:l,to:t,options:s})})}getUnmatchedAutoAnimateElements(e){return[].slice.call(e.children).reduce((e,t)=>{const i=t.querySelector("[data-auto-animate-target]");return t.hasAttribute("data-auto-animate-target")||i||e.push(t),t.querySelector("[data-auto-animate-target]")&&(e=e.concat(this.getUnmatchedAutoAnimateElements(t))),e},[])}}class w{constructor(e){this.Reveal=e}showAll(){s(this.Reveal.getSlidesElement().querySelectorAll(".fragment")).forEach(e=>{e.classList.add("visible"),e.classList.remove("current-fragment")})}availableRoutes(){let e=this.Reveal.getCurrentSlide();if(e&&this.Reveal.getConfig().fragments){let t=e.querySelectorAll(".fragment"),i=e.querySelectorAll(".fragment:not(.visible)");return{prev:t.length-i.length>0,next:!!i.length}}return{prev:!1,next:!1}}sort(e,t=!1){e=s(e);let i=[],a=[],n=[];e.forEach(e=>{if(e.hasAttribute("data-fragment-index")){let t=parseInt(e.getAttribute("data-fragment-index"),10);i[t]||(i[t]=[]),i[t].push(e)}else a.push([e])}),i=i.concat(a);let r=0;return i.forEach(e=>{e.forEach(e=>{n.push(e),e.setAttribute("data-fragment-index",r)}),r++}),!0===t?i:n}sortAll(){this.Reveal.getHorizontalSlides().forEach(e=>{let t=s(e.querySelectorAll("section"));t.forEach((e,t)=>{this.sort(e.querySelectorAll(".fragment"))},this),0===t.length&&this.sort(e.querySelectorAll(".fragment"))})}update(e,t){let i={shown:[],hidden:[]},a=this.Reveal.getCurrentSlide();if(a&&this.Reveal.getConfig().fragments&&(t=t||this.sort(a.querySelectorAll(".fragment"))).length){let n=0;if("number"!=typeof e){let 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\ No newline at end of file
diff --git a/js/reveal.js b/js/reveal.js
index 0d1d506..63a7ea7 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -292,8 +292,6 @@ export default function( revealElement, options ) {
 			statusElement.style.position = 'absolute';
 			statusElement.style.height = '1px';
 			statusElement.style.width = '1px';
-			statusElement.style.top = '-1px';
-			statusElement.style.left = '-1px';
 			statusElement.style.overflow = 'hidden';
 			statusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';
 			statusElement.classList.add( 'aria-status' );
@@ -370,7 +368,7 @@ export default function( revealElement, options ) {
 		// Limit the size of certain elements to the dimensions of the slide
 		createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
 
-		document.querySelector('html').classList.add( 'print-pdf' );
+		document.documentElement.classList.add( 'print-pdf' );
 		document.body.style.width = pageWidth + 'px';
 		document.body.style.height = pageHeight + 'px';