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HTML 

              
                <!-- This effect is an enhanced version of https://codepen.io/GreenSock/pen/AGzci which only animated 1 word at a time.  -->

<link href='https://fonts.googleapis.com/css?family=Asap:400,700' rel='stylesheet' type='text/css'>
<div id="demo"></div>
<h2>special features</h2>
<ul>
  <li>Duration of each chunk's animation is based on character count giving you more time to read longer chunks</li>    
  <li>Last part of the sentence stays on screen longer</li>
  <li>Pause added after each sentence</li>
</ul>
!

CSS 

              
                body{
	background-color:#111;
  color:white;
  
}
#demo{
  position:relative;
  width:800px;
  height:300px;
  background-color:#000;
  margin:auto;
  overflow:hidden;
}

#demo h3 {
  position:absolute;
  font-family: 'Asap', sans-serif;
  font-weight:700;
  margin:0;
  padding:0;
  width:800px;
  text-align:center;
  visibility:hidden;
  font-size:120px;
  top:65px;
  will-change: transform;
}
h2 {
  color:#9af600;
  margin-left:24px;
  margin-bottom:0px;
}
li {
  font-family: 'Asap', sans-serif;
  color:#999;
  margin-bottom:10px;
}
!

JS 

              
                var container = $("#demo"),
    _sentenceEndExp = /(\.|\?|!)$/g; //regular expression to sense punctuation that indicates the end of a sentence so that we can adjust timing accordingly

//this function just takes a string of text and splits it into an array based on the maximum length that should be allowed to exist in each line, and when it encounters the end of a sentence (ending in ".", "?", or "!"), it will force a line break too.
function buildChunks(text, maxLength) {
  if (maxLength === undefined) {
    return text.split(" ");
  }
  var words = text.split(" "),
      wordCount = words.length,
      chunk = [],
      chunks = [], i;
  for (i = 0; i < wordCount; i++){
    chunk.push(words[i]);
    if (_sentenceEndExp.test(words[i]) || i === wordCount - 1 || chunk.join(" ").length + words[i+1].length > maxLength) {
      chunks.push(chunk.join(" "));
      chunk = [];
    }
  }
  return chunks;
}

function machineGun(chunks, maxLength) {
  //in case "chunks" isn't an array, we'll build chunks automatically
  if (!(chunks instanceof Array)) {
    chunks = buildChunks(chunks, maxLength);
  }
  
  var tl = new TimelineMax({delay:0.6, repeat:2, repeatDelay:4}),
      time = 0,
      chunk, element, duration, isSentenceEnd, i;
  
  for (i = 0; i < chunks.length; i++) {
    chunk = chunks[i];
    isSentenceEnd = _sentenceEndExp.test(chunk) || (i === chunks.length - 1);
    element = $("<h3>" + chunk + "</h3>").appendTo(container);
      duration = Math.max(0.5, chunk.length * 0.08); //longer words take longer to read, so adjust timing. Minimum of 0.5 seconds.
      if (isSentenceEnd) {
        duration += 0.6; //if it's the last word in a sentence, drag out the timing a bit for a dramatic pause.
      }
      //set opacity and scale to 0 initially. We set z to 0.01 just to kick in 3D rendering in the browser which makes things render a bit more smoothly.
    TweenLite.set(element, {autoAlpha:0, scale:0, z:0.01});
    //the SlowMo ease is like an easeOutIn but it's configurable in terms of strength and how long the slope is linear. See https://www.greensock.com/v12/#slowmo and https://api.greensock.com/js/com/greensock/easing/SlowMo.html
    tl.to(element, duration, {scale:1.2,  ease:SlowMo.ease.config(0.25, 0.9)}, time)
      //notice the 3rd parameter of the SlowMo config is true in the following tween - that causes it to yoyo, meaning opacity (autoAlpha) will go up to 1 during the tween, and then back down to 0 at the end. 
		 	  .to(element, duration, {autoAlpha:1, ease:SlowMo.ease.config(0.25, 0.9, true)}, time);
      time += duration - 0.05;
      if (isSentenceEnd) {
        time += 0.6; //at the end of a sentence, add a pause for dramatic effect.
      }
    }
}

machineGun("This text will suck you in and you will not believe what is coming next. Actually that is about all that is going to happen. I am glad you watched. THE END", 12);

/* learn more about the GreenSock Animation Platfrom (GSAP) for JS

https://www.greensock.com/gsap-js/

watch a quick video on how TimelineLite allows you to sequence animations like a pro
https://www.greensock.com/sequence-video/

*/
!
999px

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