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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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About the <head>

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                overlay<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Motionly overlay</title>
  <!-- The Motionly library is imported via the CodePen JavaScript settings -->
</head>
<body>
  <img
    id="xp"
    src="https://f.mtly.io/front/3/svg/nm/koppasoft-e-4912971641782272.svg"
    motionly-params='
    {
      "setup":
      {
        "manual": true
      },
      "callbacks": "motionlyCallbacks"
    }'
  />
  <div class="blahblah">
    <div>
      Praesent in mauris eu tortor porttitor accumsan. Mauris suscipit, ligula sit amet pharetra semper, nibh ante cursus
      purus, vel sagittis velit mauris vel metus. Aenean fermentum risus id tortor. Integer imperdiet lectus quis justo.
      Integer tempor. Vivamus ac urna vel leo pretium faucibus. Mauris elementum mauris vitae tortor. In dapibus augue non
      sapien. Aliquam ante. Curabitur bibendum justo non orci.
    </div>
    <div>
      Morbi leo mi, nonummy eget, tristique non, rhoncus non, leo. Nullam faucibus mi quis velit. Integer in sapien. Fusce
      tellus odio, dapibus id, fermentum quis, suscipit id, erat. Fusce aliquam vestibulum ipsum. Aliquam erat volutpat.
      Pellentesque sapien. Cras elementum. Nulla pulvinar eleifend sem. Cum sociis natoque penatibus et magnis dis
      parturient montes, nascetur ridiculus mus. Quisque porta. Vivamus porttitor turpis ac leo.
    </div>
    <div>
      Maecenas ipsum velit, consectetuer eu, lobortis ut, dictum at, dui. In rutrum. Sed ac dolor sit amet purus malesuada
      congue. In laoreet, magna id viverra tincidunt, sem odio bibendum justo, vel imperdiet sapien wisi sed libero.
      Suspendisse sagittis ultrices augue. Mauris metus. Nunc dapibus tortor vel mi dapibus sollicitudin. Etiam posuere
      lacus quis dolor. Praesent id justo in neque elementum ultrices. Class aptent taciti sociosqu ad litora torquent per
      conubia nostra, per inceptos hymenaeos. In convallis. Fusce suscipit libero eget elit. Praesent vitae arcu tempor
      neque lacinia pretium. Morbi imperdiet, mauris ac auctor dictum, nisl ligula egestas nulla, et sollicitudin sem
      purus in lacus.
    </div>
    <div>
      Aenean placerat. In vulputate urna eu arcu. Aliquam erat volutpat. Suspendisse potenti. Morbi mattis felis at nunc.
      Duis viverra diam non justo. In nisl. Nullam sit amet magna in magna gravida vehicula. Mauris tincidunt sem sed
      arcu. Nunc posuere. Nullam lectus justo, vulputate eget, mollis sed, tempor sed, magna. Cum sociis natoque penatibus
      et magnis dis parturient montes, nascetur ridiculus mus. Etiam neque. Curabitur ligula sapien, pulvinar a,
      vestibulum quis, facilisis vel, sapien. Nullam eget nisl. Donec vitae arcu.
    </div>
    <div>
      Ut velit mauris, egestas sed, gravida nec, ornare ut, mi. Aenean ut orci vel massa suscipit pulvinar. Nulla
      sollicitudin. Fusce varius, ligula non tempus aliquam, nunc turpis ullamcorper nibh, in tempus sapien eros vitae
      ligula. Pellentesque rhoncus nunc et augue. Integer id felis. Curabitur aliquet pellentesque diam. Integer quis
      metus vitae elit lobortis egestas. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi vel erat non
      mauris convallis vehicula. Nulla et sapien. Integer tortor tellus, aliquam faucibus, convallis id, congue eu, quam.
      Mauris ullamcorper felis vitae erat. Proin feugiat, augue non elementum posuere, metus purus iaculis lectus, et
      tristique ligula justo vitae magna.
    </div>
    <div>
      Aliquam convallis sollicitudin purus. Praesent aliquam, enim at fermentum mollis, ligula massa adipiscing nisl, ac
      euismod nibh nisl eu lectus. Fusce vulputate sem at sapien. Vivamus leo. Aliquam euismod libero eu enim. Nulla nec
      felis sed leo placerat imperdiet. Aenean suscipit nulla in justo. Suspendisse cursus rutrum augue. Nulla tincidunt
      tincidunt mi. Curabitur iaculis, lorem vel rhoncus faucibus, felis magna fermentum augue, et ultricies lacus lorem
      varius purus. Curabitur eu amet.
    </div>
    <div>
      Ut velit mauris, egestas sed, gravida nec, ornare ut, mi. Aenean ut orci vel massa suscipit pulvinar. Nulla
      sollicitudin. Fusce varius, ligula non tempus aliquam, nunc turpis ullamcorper nibh, in tempus sapien eros vitae
      ligula. Pellentesque rhoncus nunc et augue. Integer id felis. Curabitur aliquet pellentesque diam. Integer quis
      metus vitae elit lobortis egestas. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi vel erat non
      mauris convallis vehicula. Nulla et sapien. Integer tortor tellus, aliquam faucibus, convallis id, congue eu, quam.
      Mauris ullamcorper felis vitae erat. Proin feugiat, augue non elementum posuere, metus purus iaculis lectus, et
      tristique ligula justo vitae magna.
    </div>
    <div>
      Aliquam convallis sollicitudin purus. Praesent aliquam, enim at fermentum mollis, ligula massa adipiscing nisl, ac
      euismod nibh nisl eu lectus. Fusce vulputate sem at sapien. Vivamus leo. Aliquam euismod libero eu enim. Nulla nec
      felis sed leo placerat imperdiet. Aenean suscipit nulla in justo. Suspendisse cursus rutrum augue. Nulla tincidunt
      tincidunt mi. Curabitur iaculis, lorem vel rhoncus faucibus, felis magna fermentum augue, et ultricies lacus lorem
      varius purus. Curabitur eu amet.
    </div>
    <div>
      Praesent in mauris eu tortor porttitor accumsan. Mauris suscipit, ligula sit amet pharetra semper, nibh ante cursus
      purus, vel sagittis velit mauris vel metus. Aenean fermentum risus id tortor. Integer imperdiet lectus quis justo.
      Integer tempor. Vivamus ac urna vel leo pretium faucibus. Mauris elementum mauris vitae tortor. In dapibus augue non
      sapien. Aliquam ante. Curabitur bibendum justo non orci.
    </div>
    <div>
      Morbi leo mi, nonummy eget, tristique non, rhoncus non, leo. Nullam faucibus mi quis velit. Integer in sapien. Fusce
      tellus odio, dapibus id, fermentum quis, suscipit id, erat. Fusce aliquam vestibulum ipsum. Aliquam erat volutpat.
      Pellentesque sapien. Cras elementum. Nulla pulvinar eleifend sem. Cum sociis natoque penatibus et magnis dis
      parturient montes, nascetur ridiculus mus. Quisque porta. Vivamus porttitor turpis ac leo.
    </div>
    <div>
      Maecenas ipsum velit, consectetuer eu, lobortis ut, dictum at, dui. In rutrum. Sed ac dolor sit amet purus malesuada
      congue. In laoreet, magna id viverra tincidunt, sem odio bibendum justo, vel imperdiet sapien wisi sed libero.
      Suspendisse sagittis ultrices augue. Mauris metus. Nunc dapibus tortor vel mi dapibus sollicitudin. Etiam posuere
      lacus quis dolor. Praesent id justo in neque elementum ultrices. Class aptent taciti sociosqu ad litora torquent per
      conubia nostra, per inceptos hymenaeos. In convallis. Fusce suscipit libero eget elit. Praesent vitae arcu tempor
      neque lacinia pretium. Morbi imperdiet, mauris ac auctor dictum, nisl ligula egestas nulla, et sollicitudin sem
      purus in lacus.
    </div>
    <div>
      Aenean placerat. In vulputate urna eu arcu. Aliquam erat volutpat. Suspendisse potenti. Morbi mattis felis at nunc.
      Duis viverra diam non justo. In nisl. Nullam sit amet magna in magna gravida vehicula. Mauris tincidunt sem sed
      arcu. Nunc posuere. Nullam lectus justo, vulputate eget, mollis sed, tempor sed, magna. Cum sociis natoque penatibus
      et magnis dis parturient montes, nascetur ridiculus mus. Etiam neque. Curabitur ligula sapien, pulvinar a,
      vestibulum quis, facilisis vel, sapien. Nullam eget nisl. Donec vitae arcu.
    </div>
    <div>
      Ut velit mauris, egestas sed, gravida nec, ornare ut, mi. Aenean ut orci vel massa suscipit pulvinar. Nulla
      sollicitudin. Fusce varius, ligula non tempus aliquam, nunc turpis ullamcorper nibh, in tempus sapien eros vitae
      ligula. Pellentesque rhoncus nunc et augue. Integer id felis. Curabitur aliquet pellentesque diam. Integer quis
      metus vitae elit lobortis egestas. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi vel erat non
      mauris convallis vehicula. Nulla et sapien. Integer tortor tellus, aliquam faucibus, convallis id, congue eu, quam.
      Mauris ullamcorper felis vitae erat. Proin feugiat, augue non elementum posuere, metus purus iaculis lectus, et
      tristique ligula justo vitae magna.
    </div>
    <div>
      Aliquam convallis sollicitudin purus. Praesent aliquam, enim at fermentum mollis, ligula massa adipiscing nisl, ac
      euismod nibh nisl eu lectus. Fusce vulputate sem at sapien. Vivamus leo. Aliquam euismod libero eu enim. Nulla nec
      felis sed leo placerat imperdiet. Aenean suscipit nulla in justo. Suspendisse cursus rutrum augue. Nulla tincidunt
      tincidunt mi. Curabitur iaculis, lorem vel rhoncus faucibus, felis magna fermentum augue, et ultricies lacus lorem
      varius purus. Curabitur eu amet.
    </div>
    <div>
      Ut velit mauris, egestas sed, gravida nec, ornare ut, mi. Aenean ut orci vel massa suscipit pulvinar. Nulla
      sollicitudin. Fusce varius, ligula non tempus aliquam, nunc turpis ullamcorper nibh, in tempus sapien eros vitae
      ligula. Pellentesque rhoncus nunc et augue. Integer id felis. Curabitur aliquet pellentesque diam. Integer quis
      metus vitae elit lobortis egestas. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi vel erat non
      mauris convallis vehicula. Nulla et sapien. Integer tortor tellus, aliquam faucibus, convallis id, congue eu, quam.
      Mauris ullamcorper felis vitae erat. Proin feugiat, augue non elementum posuere, metus purus iaculis lectus, et
      tristique ligula justo vitae magna.
    </div>
    <div>
      Aliquam convallis sollicitudin purus. Praesent aliquam, enim at fermentum mollis, ligula massa adipiscing nisl, ac
      euismod nibh nisl eu lectus. Fusce vulputate sem at sapien. Vivamus leo. Aliquam euismod libero eu enim. Nulla nec
      felis sed leo placerat imperdiet. Aenean suscipit nulla in justo. Suspendisse cursus rutrum augue. Nulla tincidunt
      tincidunt mi. Curabitur iaculis, lorem vel rhoncus faucibus, felis magna fermentum augue, et ultricies lacus lorem
      varius purus. Curabitur eu amet.
    </div>
  </div>
</body>
</html>
!

CSS 

              
                :root
{
  overflow: hidden;
}

body
{
  margin: 0;
  overflow-y: scroll;
  width: 100vw;
  height: 100vh;
  background: #212121;
}

#xp
{
  display: block;
  width: 20%;
  height: auto;
  position: fixed;
  right: 20px;
  bottom: 20px;
  border-radius: 8%;
}

.blahblah
{
  color: white;
  font-style: italic;
  font-size: xx-large;
  width: 50%;
  margin-left: auto;
  margin-right: auto;
}

.blahblah > div
{
  margin-top: 50px;
  margin-bottom: 50px;
}

@media only screen and (max-width: 767px)
{

  #xp
  {
    width: 40%;
  }

  .blahblah
  {
    font-size: large;
    width: 90%;
  }

}
!

JS 

              
                function motionlyCallbacks(callbackContext)
{

  var eventListener;
  var eventType = "scroll";

  function render(xpContext, percentage)
  {
    var tracksCount = xpContext.tracks.length;
    var trackPercentage = 1 / tracksCount;
    var trackIndex = Math.min(tracksCount - 1, Math.floor(percentage / trackPercentage));
    var trackId = xpContext.tracks[trackIndex].id;
    var innerPercentage = (percentage - trackIndex * trackPercentage) / trackPercentage;
    xpContext.goto(trackId, innerPercentage, true, false);
  }

  return {
    version: 2,
    onTechnicalEvent: function (experienceIds, experienceContext, event)
    {
      if (experienceContext.manual !== true)
      {
        return;
      }
      var eventElement = document.body;
      if (event === "installed")
      {
        eventListener = function (event)
        {
          var percentage = (eventElement.scrollTop) / (eventElement.scrollHeight - eventElement.clientHeight)
          render(experienceContext, percentage);
        };
        eventElement.addEventListener(eventType, eventListener);
        render(experienceContext, 0);
      }
      else if (event === "unloaded")
      {
        if (eventListener !== undefined)
        {
          eventElement.removeEventListener(eventType, eventListener);
        }
      }
    }
  };
}
!
999px

Console