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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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Insecure Resource

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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

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div class="ImageComparison">
  <div class="overlap">
    <div class="clipper">
      <div class="try yor">
        <div class="text-r text"> Innocent Yor </div>
        <img src='https://static.zerochan.net/Yor.Briar.full.3493455.png'alt="">
      </div>
    </div>
    <div class="try2 yor">
      <div class="text-l text"> Assassin Yor </div>
      <img src='https://images.unsplash.com/photo-1482245294234-b3f2f8d5f1a4?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=1922d6e6f96e8e67aac67057877e15da' alt="">
    </div>
  </div>
</div>
!

CSS 

              
                body {
  width:100%;
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
}
.yor {
  width: 500px;
  height: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  object-fit: cover;
  justify-content: center;
}

img {
  width: 500px;
  height: auto;
}

.text {
  margin-bottom: 12px;
  font-size: 22px;
  pointer-events: none;
}

.try {
  background: yellow;
}

.try2 {
  background: blue;
  position: absolute;
  top: 0;
  left: 0;
  .text {
    color: white;
  }
}

.overlap {
  position: relative;
  border-radius: 10000px;
  overflow: hidden;
  width: 500px;
  height: 500px
}

.clipper {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  overflow: hidden;
  z-index: 100;
}
!

JS 

              
                const overlap = document.querySelector('.overlap');
const clipper = document.querySelector('.clipper');

// make sure things work when the window gets resized, so we'll use a few variables that get set on resize (and initially)
let offset, clamp;
function setOffset() {
  offset = overlap.getBoundingClientRect().left;
  // a clamping function so the width is limited to between 0 and the width of the overlap.
  clamp = gsap.utils.clamp(0, overlap.getBoundingClientRect().width);
}
setOffset(); // set them initially
window.addEventListener("resize", setOffset); // and on resize

Observer.create({
  target: document,
  type: "pointer,touch", // make it work on touch and pointer/mouse devices
  onMove: self => clipper.style.width = clamp(self.x - offset) + "px",
});
!
999px

Console