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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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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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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.

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HTML 

              
                <div class="container">
  <div class="bar">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="amount">$0.00</div>
</div>
!

CSS 

              
                body {
  text-align: center;
  min-height: 400vh;
}

.bar {
  width: 80vw;
  height: 30vh;
  border: 4px solid gray;
  margin: auto;
  padding: 8px;
  display: flex;
  align-items: stretch;
  gap: 8px;
}
.amount {
  margin: 20px;
  font-size: 36px;
}

.box {
  background-color: #c0a711;
  flex-grow: 1;
}
!

JS 

              
                let tl = gsap.timeline({
  scrollTrigger: {
    trigger: ".container",
    start: "top 8px",
    end: "top 8px",
//    end: "+=800", // pin for 800 pixels worth of scroll
    scrub: false,
    //pin: true
  }
});

tl.from(".box", {
  visibility: "hidden",
  duration: 0.01, // just a tiny amount of duration so it's like a toggle since visibility isn't really animatable. 
  stagger: 0.1 // stagger the starting time of each subsequent reveal
}).tweenTo(tl.duration() * 0.75);

// create a proxy object so we can tween the numeric value and plug it into the amount element's innerText using an onUpdate()
let amountProxy = {value: 0},
    amountEl = document.querySelector(".amount");
tl.to(amountProxy, {
  value: 800,
  onUpdate: () => amountEl.innerText = "$" + formatNumber(amountProxy.value, 2),
  duration: tl.duration(), // just match however long the entire timeline is at this point (it's only populated with the visibility toggles, so it'll stretch to fit those exactly)
  ease: "none"
}, 0) // <- position parameter places it at the very start of the timeline, so it overlaps with the toggling visibility stuff.


// a helper function for formatting a number - it adds commas and forces a certain number of decimal places.
function formatNumber(value, decimals) {
  let s = (+value).toLocaleString('en-US').split(".");
  return decimals ? s[0] + "." + ((s[1] || "") + "00000000").substr(0, decimals) : s[0];
}
!
999px

Console