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HTML

About HTML Preprocessors

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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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
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).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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About Packages

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 id="viewport">
		<div id="scroll-container">
			<h1>Lorem ipsum dolor sit amet consectetur adipisicing elit. Natus repellat corrupti totam, facilis magni necessitatibus, obcaecati amet itaque ipsam ipsa culpa iure sapiente provident accusamus quam officia fugiat! Est consequuntur ab dignissimos quaerat hic illum incidunt nulla officia quas alias consectetur voluptatum vero, ipsum consequatur possimus, nostrum corporis in voluptate quasi itaque atque impedit? Minima, culpa. Ea cumque, nam veritatis, a illum vero labore voluptates, ipsam numquam aliquam modi asperiores nihil enim blanditiis dolorem doloribus non soluta odit. Enim dolorem cum officiis architecto natus corporis rerum numquam porro molestias, earum nobis at! Error, similique fugiat nobis assumenda quisquam id, perspiciatis deserunt consequuntur ex autem dignissimos, pariatur praesentium maxime officiis corporis itaque odit rem sit fugit aperiam et ipsum nulla facilis laborum. Earum unde odio libero quos odit reprehenderit provident voluptate optio sunt ducimus necessitatibus veritatis, delectus quia nesciunt pariatur. Est ullam facere magni. Aliquam voluptate, dolores ducimus dolorem nisi reiciendis hic beatae necessitatibus dolorum ex nam nesciunt? Consectetur dolorum dolor dignissimos quas tenetur recusandae asperiores magnam error omnis assumenda, minima consequuntur magni sequi vero? Eum natus exercitationem tenetur soluta, delectus nam sunt quisquam consequatur dolor voluptate non blanditiis labore, enim voluptates dolores cumque beatae totam voluptas placeat praesentium officia! Provident!</h1>
		</div>
	</div>
!

CSS 

              
                h1 {
  font-size: 10vw;
}


#viewport {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
}

#scroll-container {
  position: absolute;
  overflow: hidden;
  width: 100%;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

const container = document.querySelector('#scroll-container');
const height = container.clientHeight;
document.body.style.height = `${height}px`;

gsap.to(container, {
  y: -(height - document.documentElement.clientHeight),
  ease: 'none',
  scrollTrigger: {
    trigger: document.body,
    start: 'top top',
    end: 'bottom bottom',
    scrub: 1,
  },
});
!
999px

Console