From 1b6a3b1e6f38a65cc5330b2856275cd8a39ae6d7 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Fri, 5 Jun 2020 13:17:43 +0200
Subject: [PATCH] add support for auto-sized big text via r-fit-text

---
 css/theme/template/theme.scss | 10 ++++++++++
 dist/reveal.esm.js            |  2 +-
 dist/reveal.js                |  2 +-
 dist/theme/beige.css          |  9 +++++++++
 dist/theme/black.css          |  9 +++++++++
 dist/theme/blood.css          |  9 +++++++++
 dist/theme/league.css         |  9 +++++++++
 dist/theme/moon.css           |  9 +++++++++
 dist/theme/night.css          |  9 +++++++++
 dist/theme/serif.css          |  9 +++++++++
 dist/theme/simple.css         |  9 +++++++++
 dist/theme/sky.css            |  9 +++++++++
 dist/theme/solarized.css      |  9 +++++++++
 dist/theme/white.css          |  9 +++++++++
 examples/layout-helpers.html  | 14 ++++++++++++++
 js/reveal.js                  | 11 +++++++++++
 package-lock.json             |  8 +++++++-
 package.json                  |  1 +
 18 files changed, 144 insertions(+), 3 deletions(-)

diff --git a/css/theme/template/theme.scss b/css/theme/template/theme.scss
index c3e6474..9cf0511 100644
--- a/css/theme/template/theme.scss
+++ b/css/theme/template/theme.scss
@@ -79,6 +79,16 @@
 	line-height: 1.3;
 }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+	margin-bottom: 0;
+}
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/reveal.esm.js b/dist/reveal.esm.js
index 15956c3..8352ccb 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.hasAttribute("data-auto-animate-target")||i||e.push(t),t.querySelector("[data-auto-animate-target]")&&(e=e.concat(this.getUnmatchedAutoAnimateElements(t))),e},[])}}class Ei{constructor(e){this.Reveal=e}configure(e,t){!1===e.fragments?this.disable():!1===t.fragments&&this.enable()}disable(){ei(this.Reveal.getSlidesElement(),".fragment").forEach(e=>{e.classList.add("visible"),e.classList.remove("current-fragment")})}enable(){ei(this.Reveal.getSlidesElement(),".fragment").forEach(e=>{e.classList.remove("visible"),e.classList.remove("current-fragment")})}availableRoutes(){let e=this.Reveal.getCurrentSlide();if(e&&this.Reveal.getConfig().fragments){let t=e.querySelectorAll(".fragment:not(.disabled)"),i=e.querySelectorAll(".fragment:not(.disabled):not(.visible)");return{prev:t.length-i.length>0,next:!!i.length}}return{prev:!1,next:!1}}sort(e,t=!1){e=Array.from(e);let i=[],n=[],a=[];e.forEach(e=>{if(e.hasAttribute("data-fragment-index")){let 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t="/",i=e||this.Reveal.getCurrentSlide(),n=i?i.getAttribute("id"):null;n&&(n=encodeURIComponent(n));let a=this.Reveal.getIndices(e);if(this.Reveal.getConfig().fragmentInURL||(a.f=void 0),"string"==typeof n&&n.length)t="/"+n,a.f>=0&&(t+="/"+a.f);else{let e=this.Reveal.getConfig().hashOneBasedIndex?1:0;(a.h>0||a.v>0||a.f>=0)&&(t+=a.h+e),(a.v>0||a.f>=0)&&(t+="/"+(a.v+e)),a.f>=0&&(t+="/"+a.f)}return t}onWindowHashChange(e){this.readURL()}}class Li{constructor(e){this.Reveal=e,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)}render(){const 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 class="controls-arrow"></div></button>\n\t\t\t<button class="navigate-right" aria-label="').concat(e?"previous slide":"next slide",'"><div class="controls-arrow"></div></button>\n\t\t\t<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>\n\t\t\t<button class="navigate-down" aria-label="below slide"><div 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diff --git a/dist/reveal.js b/dist/reveal.js
index 64cdbc8..c56bb4f 100644
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a;if("function"==typeof n.measure)a=n.measure(t);else if(i.center)a=t.getBoundingClientRect();else{var o=this.Reveal.getScale();a={x:t.offsetLeft*o,y:t.offsetTop*o,width:t.offsetWidth*o,height:t.offsetHeight*o}}r.x=a.x,r.y=a.y,r.width=a.width,r.height=a.height}var s=getComputedStyle(t);return(n.styles||i.autoAnimateStyles).forEach((function(t){var n;"string"==typeof t&&(t={property:t}),""!==(n=void 0!==t.from&&"from"===e?{value:t.from,explicitValue:!0}:void 0!==t.to&&"to"===e?{value:t.to,explicitValue:!0}:s[t.property])&&(r.styles[t.property]=n)})),r}},{key:"getAutoAnimatableElements",value:function(e,t){var n=("function"==typeof this.Reveal.getConfig().autoAnimateMatcher?this.Reveal.getConfig().autoAnimateMatcher:this.getAutoAnimatePairs).call(this,e,t),i=[];return n.filter((function(e,t){if(-1===i.indexOf(e.to))return i.push(e.to),!0}))}},{key:"getAutoAnimatePairs",value:function(e,t){var n=this,i=[],r="h1, h2, h3, h4, h5, h6, p, li";return 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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 c=s[l].length-1,u=o[l].length-1;o[l][c]?(i=o[l][c],o[l][c]=null):o[l][u]&&(i=o[l][u],o[l][u]=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 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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=to(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&&(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}(),zo=function(){function e(t){Ua(this,e),this.Reveal=t,this.active=!1,this.onSlideClicked=this.onSlideClicked.bind(this)}return Fa(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()),to(this.Reveal.getRevealElement(),".slides 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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()),to(this.Reveal.getRevealElement(),".slides section").forEach((function(t){ro(t,""),t.removeEventListener("click",e.onSlideClicked,!0)})),to(this.Reveal.getBackgroundsElement(),".slide-background").forEach((function(e){ro(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}(),qo=function(){function e(t){Ua(this,e),this.Reveal=t,this.shortcuts={},this.bindings={},this.onDocumentKeyDown=this.onDocumentKeyDown.bind(this),this.onDocumentKeyPress=this.onDocumentKeyPress.bind(this)}return Fa(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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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,c=e.shiftKey&&39===n,u=!s&&!l&&!c&&(e.shiftKey||e.altKey||e.ctrlKey||e.metaKey);if(!(r||a||o||u)){var d,h=[66,86,190,191];if("object"===Ha(t.keyboard))for(d in 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e(t){Ua(this,e),this.Reveal=t,this.writeURLTimeout=0,this.onWindowHashChange=this.onWindowHashChange.bind(this)}return Fa(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 c=this.Reveal.getIndices(o);this.Reveal.slide(c.h,c.v,s)}}else this.Reveal.slide(t.h||0,t.v||0)}else{var 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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 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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;lo("@page{size:"+n+"px "+i+"px; margin: 0px;}"),lo(".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);to(this.Reveal.getRevealElement(),".slides section").forEach((function(e){e.setAttribute("data-slide-number",this.Reveal.slideNumber.getSlideNumber(e))}),this),to(this.Reveal.getRevealElement(),".slides section").forEach((function(t){if(!1===t.classList.contains("stack")){var s=(n-r)/2,l=(i-a)/2,c=t.scrollHeight,u=Math.max(Math.ceil(c/i),1);(1===(u=Math.min(u,e.pdfMaxPagesPerSlide))&&e.center||t.classList.contains("center"))&&(l=Math.max((i-c)/2,0));var d=document.createElement("div");if(d.className="pdf-page",d.style.height=(i+e.pdfPageHeightOffset)*u+"px",t.parentNode.insertBefore(d,t),d.appendChild(t),t.style.left=s+"px",t.style.top=l+"px",t.style.width=r+"px",t.slideBackgroundElement&&d.insertBefore(t.slideBackgroundElement,t),e.showNotes){var h=this.Reveal.getSlideNotes(t);if(h){var f="string"==typeof e.showNotes?e.showNotes:"inline",v=document.createElement("div");v.classList.add("speaker-notes"),v.classList.add("speaker-notes-pdf"),v.setAttribute("data-layout",f),v.innerHTML=h,"separate-page"===f?d.parentNode.insertBefore(v,d.nextSibling):(v.style.left="8px",v.style.bottom="8px",v.style.width=n-16+"px",d.appendChild(v))}}if(o){var 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e(t){Ua(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 Fa(e,[{key:"bind",value:function(){var e=this.Reveal.getRevealElement();"onpointerdown"in 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e=this.Reveal.getRevealElement();e.removeEventListener("pointerdown",this.onPointerDown,!1),e.removeEventListener("pointermove",this.onPointerMove,!1),e.removeEventListener("pointerup",this.onPointerUp,!1),e.removeEventListener("MSPointerDown",this.onPointerDown,!1),e.removeEventListener("MSPointerMove",this.onPointerMove,!1),e.removeEventListener("MSPointerUp",this.onPointerUp,!1),e.removeEventListener("touchstart",this.onTouchStart,!1),e.removeEventListener("touchmove",this.onTouchMove,!1),e.removeEventListener("touchend",this.onTouchEnd,!1)}},{key:"isSwipePrevented",value:function(e){for(;e&&"function"==typeof e.hasAttribute;){if(e.hasAttribute("data-prevent-swipe"))return!0;e=e.parentNode}return!1}},{key:"onTouchStart",value:function(e){if(this.isSwipePrevented(e.target))return!0;this.touchStartX=e.touches[0].clientX,this.touchStartY=e.touches[0].clientY,this.touchStartCount=e.touches.length}},{key:"onTouchMove",value:function(e){if(this.isSwipePrevented(e.target))return!0;var 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a;if("function"==typeof n.measure)a=n.measure(t);else if(i.center)a=t.getBoundingClientRect();else{var o=this.Reveal.getScale();a={x:t.offsetLeft*o,y:t.offsetTop*o,width:t.offsetWidth*o,height:t.offsetHeight*o}}r.x=a.x,r.y=a.y,r.width=a.width,r.height=a.height}var s=getComputedStyle(t);return(n.styles||i.autoAnimateStyles).forEach((function(t){var n;"string"==typeof t&&(t={property:t}),""!==(n=void 0!==t.from&&"from"===e?{value:t.from,explicitValue:!0}:void 0!==t.to&&"to"===e?{value:t.to,explicitValue:!0}:s[t.property])&&(r.styles[t.property]=n)})),r}},{key:"getAutoAnimatableElements",value:function(e,t){var n=("function"==typeof this.Reveal.getConfig().autoAnimateMatcher?this.Reveal.getConfig().autoAnimateMatcher:this.getAutoAnimatePairs).call(this,e,t),i=[];return n.filter((function(e,t){if(-1===i.indexOf(e.to))return i.push(e.to),!0}))}},{key:"getAutoAnimatePairs",value:function(e,t){var n=this,i=[],r="h1, h2, h3, h4, h5, h6, p, li";return this.findAutoAnimateMatches(i,e,t,"[data-id]",(function(e){return e.nodeName+":::"+e.getAttribute("data-id")})),this.findAutoAnimateMatches(i,e,t,r,(function(e){return e.nodeName+":::"+e.innerText})),this.findAutoAnimateMatches(i,e,t,"img, video, iframe",(function(e){return e.nodeName+":::"+(e.getAttribute("src")||e.getAttribute("data-src"))})),this.findAutoAnimateMatches(i,e,t,"pre",(function(e){return e.nodeName+":::"+e.innerText})),i.forEach((function(e){ao(e.from,r)?e.options={scale:!1}:ao(e.from,"pre")&&(e.options={scale:!1,styles:["width","height"]},n.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-code",(function(e){return e.textContent}),{scale:!1,styles:[],measure:n.getLocalBoundingBox.bind(n)}),n.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-line[data-line-number]",(function(e){return e.getAttribute("data-line-number")}),{scale:!1,styles:["width"],measure:n.getLocalBoundingBox.bind(n)}))}),this),i}},{key:"getLocalBoundingBox",value:function(e){var 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 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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=to(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&&(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}(),Bo=function(){function e(t){Ha(this,e),this.Reveal=t,this.active=!1,this.onSlideClicked=this.onSlideClicked.bind(this)}return Ua(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()),to(this.Reveal.getRevealElement(),".slides section").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),ro(t,"translate3d("+n*e.overviewSlideWidth+"px, 0, 0)"),t.classList.contains("stack")&&to(t,"section").forEach((function(t,i){t.setAttribute("data-index-h",n),t.setAttribute("data-index-v",i),ro(t,"translate3d(0, "+i*e.overviewSlideHeight+"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()),to(this.Reveal.getRevealElement(),".slides section").forEach((function(t){ro(t,""),t.removeEventListener("click",e.onSlideClicked,!0)})),to(this.Reveal.getBackgroundsElement(),".slide-background").forEach((function(e){ro(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 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diff --git a/dist/theme/beige.css b/dist/theme/beige.css
index e728ef4..7e7a7e6 100644
--- a/dist/theme/beige.css
+++ b/dist/theme/beige.css
@@ -108,6 +108,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/black.css b/dist/theme/black.css
index 88396e3..6df4aa8 100644
--- a/dist/theme/black.css
+++ b/dist/theme/black.css
@@ -101,6 +101,15 @@ section.has-light-background, section.has-light-background h1, section.has-light
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/blood.css b/dist/theme/blood.css
index 0a9f5d4..9062842 100644
--- a/dist/theme/blood.css
+++ b/dist/theme/blood.css
@@ -107,6 +107,15 @@ section.has-light-background, section.has-light-background h1, section.has-light
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/league.css b/dist/theme/league.css
index d2821e2..e255ca8 100644
--- a/dist/theme/league.css
+++ b/dist/theme/league.css
@@ -110,6 +110,15 @@ section.has-light-background, section.has-light-background h1, section.has-light
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/moon.css b/dist/theme/moon.css
index d799c99..eff9c2d 100644
--- a/dist/theme/moon.css
+++ b/dist/theme/moon.css
@@ -108,6 +108,15 @@ section.has-light-background, section.has-light-background h1, section.has-light
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/night.css b/dist/theme/night.css
index 3f011dd..0abd954 100644
--- a/dist/theme/night.css
+++ b/dist/theme/night.css
@@ -102,6 +102,15 @@ section.has-light-background, section.has-light-background h1, section.has-light
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/serif.css b/dist/theme/serif.css
index e293916..1744dd1 100644
--- a/dist/theme/serif.css
+++ b/dist/theme/serif.css
@@ -104,6 +104,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/simple.css b/dist/theme/simple.css
index 385b202..ff3e063 100644
--- a/dist/theme/simple.css
+++ b/dist/theme/simple.css
@@ -104,6 +104,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/sky.css b/dist/theme/sky.css
index 77ab8d5..ab9a40c 100644
--- a/dist/theme/sky.css
+++ b/dist/theme/sky.css
@@ -111,6 +111,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/solarized.css b/dist/theme/solarized.css
index e555f41..f51cf94 100644
--- a/dist/theme/solarized.css
+++ b/dist/theme/solarized.css
@@ -105,6 +105,15 @@ html * {
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/dist/theme/white.css b/dist/theme/white.css
index db93153..be28700 100644
--- a/dist/theme/white.css
+++ b/dist/theme/white.css
@@ -101,6 +101,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,
diff --git a/examples/layout-helpers.html b/examples/layout-helpers.html
index a815a29..a8375ed 100644
--- a/examples/layout-helpers.html
+++ b/examples/layout-helpers.html
@@ -22,6 +22,7 @@
 				<section>
 					<h2>Layout Helper Examples</h2>
 					<ul>
+						<li><a href="#/fit-text">Big Text</a></li>
 						<li><a href="#/stretch">Stretch</a></li>
 						<li><a href="#/stack">Stack</a></li>
 						<li><a href="#/hstack">HStack</a></li>
@@ -29,6 +30,19 @@
 					</ul>
 				</section>
 
+				<section id="fit-text">
+					<h2>Fit Text</h2>
+					<p>Resizes text to be as large as possible within its container.</p>
+					<pre><code class="html" data-trim data-line-numbers>
+					  <h2 class="r-fit-text">FIT-TEXT</h2>
+					</code></pre>
+				</section>
+
+				<section>
+					<h2 class="r-fit-text">HELLO WORLD</h2>
+					<h2 class="r-fit-text">BOTH THESE TITLES USE FIT-TEXT</h2>
+				</section>
+
 				<section id="stretch">
 					<h2>Stretch</h2>
 					<p>Makes an element as tall as possible while remaining within the slide bounds.</p>
diff --git a/js/reveal.js b/js/reveal.js
index 4657707..87635e4 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -25,6 +25,8 @@ import {
 	POST_MESSAGE_METHOD_BLACKLIST
 } from './utils/constants.js'
 
+import fitty from 'fitty';
+
 // The reveal.js version
 export const VERSION = '4.0.2';
 
@@ -281,6 +283,15 @@ export default function( revealElement, options ) {
 		dom.statusElement = createStatusElement();
 
 		dom.wrapper.setAttribute( 'role', 'application' );
+
+		// The r-fit-text helper resizes text to be as large as
+		// possible within its given container
+		fitty( '.r-fit-text', {
+			minSize: 24,
+			maxSize: config.height * 0.8,
+			observeMutations: false,
+			observeWindow: false
+		} );
 	}
 
 	/**
diff --git a/package-lock.json b/package-lock.json
index c492801..d47f330 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "reveal.js",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -3068,6 +3068,12 @@
         "parse-filepath": "^1.0.1"
       }
     },
+    "fitty": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/fitty/-/fitty-2.3.0.tgz",
+      "integrity": "sha512-a4axS2xr0Lcp95We4hIrAvpgdzp6WHPaHp9neb5kMdjefCsNLoD4lPx69yKtKe60X/ZMEJznsPot6C1Tw5KZOA==",
+      "dev": true
+    },
     "flagged-respawn": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/flagged-respawn/-/flagged-respawn-1.0.1.tgz",
diff --git a/package.json b/package.json
index b1f45e5..fd4537d 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "babel-plugin-transform-html-import-to-string": "0.0.1",
     "colors": "^1.4.0",
     "core-js": "^3.6.5",
+    "fitty": "^2.3.0",
     "glob": "^7.1.6",
     "gulp": "^4.0.2",
     "gulp-autoprefixer": "^7.0.1",