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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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Adding Classes

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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.

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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.

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

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HTML 

              
                <h1>Scroll down luv</h1>
<div class="marquee" data-reversed="false">
	<span>Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
</div>
<div class="marquee" data-reversed="true">
	<span>Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
</div>
<div class="marquee" data-reversed="false">
	<span>Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
	<span aria-hidden="true">Oi, oi!</span>
</div>
!

CSS 

              
                body {
	padding: 25vh 0 50vh 0;
	background: #222;
    scroll-behavior: smooth;
	font: 600 8vw/1 "Inter", sans-serif;
}

h1 {
	color: #777;
	display: block;
	font-size: 1.5rem;
	padding: 0 0 35vh 0;
	text-align: center;
	text-transform: uppercase;
}

.marquee {
	display: flex;
	padding: 15px 0;
	margin: 20px 0;
	white-space: nowrap;
	color: #DDD;
	justify-content: flex-end;
	background: #111;
	
	&[data-reversed="true"] {
		justify-content: flex-start;
	}
	
	span {
		display: block;
		padding: 0 1ch;
	}
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

let direction = 1;

const duration = 8;
const marquees = document.querySelectorAll(".marquee");
const tl = gsap.timeline({
	repeat: -1,
	yoyo: false,
    onReverseComplete() { 
      this.totalTime(this.rawTime() + this.duration() * 10); // otherwise when the playhead gets back to the beginning, it'd stop. So push the playhead forward 10 iterations (it could be any number)
    }
});

marquees.forEach(marquee => {
	// This works beacause all the elements inside the marquee wrapper are exactly the same
	tl.to(marquee.querySelectorAll("span"), {
		xPercent: marquee.dataset.reversed === "true" ? -100 : 100,
		repeat: 0,
		ease: "linear",
		duration: duration
	}, "<");
});


let scroll = ScrollTrigger.create({
	onUpdate(self) {
		// Update the direction of the animation based on the direction of scroll
		if (self.direction !== direction) {
			direction *= -1;
		}
		
		// Update the animation speed (duration) based on the scroll speed
		tl.timeScale(duration * self.getVelocity() / 500);
		
		// Go back to the default duration
		gsap.to(tl, {timeScale: direction});	
	}
});
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999px

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