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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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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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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.

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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 

              
                <!-- Notice: Codepen requires YouTube embed/video to be muted if using autoplay which adwire adds automatically for seamless user experience. This won't be required on your website. -->

<h1>Lorem Ipsum</h1>

<p>
	Lorem ipsum dolor sit amet consectetur, adipisicing elit. Dolor illum voluptas inventore assumenda? Dolorem explicabo excepturi aperiam deserunt quas! Earum aspernatur provident quisquam quia ad amet! Nemo magni accusamus temporibus.
</p>

<p>
	Quae enim minus dolore fugiat vel, nostrum vero magni distinctio cumque inventore omnis saepe? Ratione deleniti magni possimus error earum neque perferendis, sequi mollitia ducimus quasi eligendi illo impedit asperiores.
</p>

<p>
	Accusamus soluta voluptas exercitationem ea vel dolor sed recusandae sapiente iure totam veritatis distinctio, quam aut, repellendus ipsam repellat voluptatem inventore et voluptatibus asperiores minima tenetur, reiciendis perspiciatis. Sed, cumque.
</p>

<div class="adwire-responsive">
	<iframe loading="lazy" width="560" height="315" src="https://www.youtube.com/embed/R6MlUcmOul8?mute=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen referrerpolicy="no-referrer"></iframe>
</div>

<p>
	Veritatis libero quam dicta doloremque laudantium officiis magnam, fugiat quaerat nam ratione. Delectus voluptatem voluptas fugiat, commodi ad esse iusto aut reiciendis ea obcaecati aspernatur laudantium adipisci earum cum iure!
</p>

<p>
	Totam ratione quod voluptatibus aut non perferendis quaerat dignissimos odio accusamus id. Laborum, illo neque molestiae consectetur cumque at vel dignissimos eaque earum temporibus asperiores eius enim commodi repellat voluptates.
</p>

<p>
	Adipisci eius impedit architecto laudantium sit, obcaecati expedita exercitationem totam sapiente repellendus voluptates, unde quia accusantium! Autem nisi aspernatur debitis, iste, blanditiis dolore aliquam mollitia molestias pariatur veniam illum delectus!
</p>
!

CSS 

              
                @charset "utf-8";

.adwire-responsive {
	position: relative;
	padding-bottom: 56.25%;
}

.adwire-responsive > iframe, /* original YouTube iframe */
.adwire-responsive .adwire-iframe,
.adwire-responsive .adwire {
	position: absolute;
}

.adwire-responsive > iframe, /* original YouTube iframe */
.adwire-responsive .adwire-iframe,
.adwire-responsive .adwire,
.adwire-responsive .adwire .adwire-ad,
.adwire-responsive .adwire .adwire-ad > *,
.adwire-responsive .adwire .adwire-ad iframe,
.adwire-responsive .adwire .adwire-ad video {
	width: 100% !important;
	height: 100% !important;
}
!

JS 

              
                "use strict";

const AD_TAG_URL =
	"https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/single_ad_samples&ciu_szs=300x250&impl=s&gdfp_req=1&env=vp&output=vast&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ct%3Dskippablelinear&correlator=";

const plugin = (api) => {
	new IntersectionObserver(
		(entries) => {
			entries.forEach(({ isIntersecting }) => {
				api[isIntersecting && !api.isPlaying() ? "play" : "pause"]();
			});
		},
		{
			threshold: 0.75
		}
	).observe(document.getElementById(api.id));
};

new Adwire({
	adTagUrl: AD_TAG_URL,
	autoplay: true,
	cookies: true,
	mode: Adwire.Mode.INSTREAM_IFRAME_YOUTUBE,
	muted: true,
	private: true,
	terms: true
})
	.use(plugin)
	.run(document.querySelector("iframe[src^='https://www.youtube.com/embed/']"));
!
999px

Console