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About the <head>

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CSS

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CSS Base

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Vendor Prefixing

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JavaScript

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HTML 

              
                <div id="sticky-parallax-header">PARALLAX COVER TO STICKY HEADER</div>

<div id="content">
	<div class="warning">
		<p>⚠️ Your browser does not support CSS Scroll-Linked Animations, so this demo won't work. If you're feeling adventurous use Chrome 89 with “Experimental Web Platform Features” enabled. Alternatively you can <a href="https://twitter.com/bramus/status/1349488687512432640" target="_top">check a recording of this feature in action</a>.</p>
	</div>
	
	<div class="info">
		<p>ℹ️ This demo usess JavaScript. In the near future we won't need JS to achieve this effect, and can go with <a href="https://codepen.io/bramus/full/ExgOPRw" target="_top">a Pure CSS Solution thanks to @scroll-timeline</a>.</p>
		<p>🐛 This demo still has one bug though: As the included <code>ScrollTimeline</code> polyfill can't properly handle <code>vh</code> units, we need to set up our <code>ScrollTimeline</code> using pixels. Upon resizing we need to recalc and attach the new timeline to the animation. It's this last part that does not play nice with the polyfill. Natively it works fine though.</p>
	</div>
	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mattis turpis eu neque tincidunt lacinia. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam auctor ultrices tortor et volutpat. Donec eu semper orci, eu fermentum orci. Vivamus aliquam lobortis egestas. Proin vel mauris vitae sem auctor cursus. Aenean sit amet odio at magna pharetra luctus nec eget urna. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Praesent in leo at tellus ultricies laoreet.</p>

	<p>Duis nec nisi a eros dictum euismod nec non enim. Donec augue neque, aliquam id finibus a, volutpat ut ligula. Nam feugiat odio elit, ut molestie mi tempus vel. Etiam vitae velit eget massa scelerisque hendrerit cursus vel justo. Sed eget euismod lectus. Morbi tincidunt diam ac diam tempor molestie. Mauris eget lectus leo. Etiam id porta turpis.</p>

	<p>Aenean ac pellentesque ante. In hac habitasse platea dictumst. Nullam efficitur, dolor ac pharetra iaculis, sem elit maximus ex, et malesuada est ipsum tempor nisi. Phasellus auctor et turpis ultrices fermentum. Mauris ac orci sapien. Quisque auctor, mi eu vestibulum dictum, nisl felis pulvinar dui, non dictum justo tellus a urna. Morbi suscipit et odio a feugiat. Sed dui nisi, iaculis a lacus posuere, dictum laoreet felis. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.</p>

	<p>Nam pulvinar congue condimentum. Pellentesque fringilla ante sed massa tincidunt feugiat. Nulla bibendum est eros, non malesuada dolor vehicula in. Morbi eu cursus arcu. Phasellus ultricies ornare lorem, non interdum orci condimentum eu. Donec condimentum condimentum ligula ut placerat. Vestibulum id neque condimentum, molestie nunc vel, suscipit turpis. Quisque orci velit, mattis et nibh non, tempor finibus erat. Nullam tristique, tortor non commodo cursus, magna turpis rhoncus leo, quis porta quam ante sed orci. Nunc vehicula imperdiet leo in vulputate. Quisque quis dolor orci.</p>

	<p>Curabitur ultrices fringilla libero sit amet porta. Nulla rhoncus venenatis euismod. Praesent non interdum sem. Nunc in nibh tincidunt, faucibus sem at, finibus turpis. Nullam vel odio blandit, tincidunt urna et, luctus lectus. Vivamus porta sem vitae turpis interdum porta eu id ligula. Fusce non nisi fringilla, malesuada metus ut, imperdiet ligula. Nunc quis lorem nibh. Duis pharetra magna vestibulum metus convallis, id mollis ligula vulputate. Sed purus est, consectetur non suscipit sit amet, hendrerit at dolor. Maecenas feugiat, quam vel ullamcorper feugiat, sapien ipsum viverra justo, id cursus metus nisi quis enim.</p>
	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mattis turpis eu neque tincidunt lacinia. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam auctor ultrices tortor et volutpat. Donec eu semper orci, eu fermentum orci. Vivamus aliquam lobortis egestas. Proin vel mauris vitae sem auctor cursus. Aenean sit amet odio at magna pharetra luctus nec eget urna. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Praesent in leo at tellus ultricies laoreet.</p>

	<p>Duis nec nisi a eros dictum euismod nec non enim. Donec augue neque, aliquam id finibus a, volutpat ut ligula. Nam feugiat odio elit, ut molestie mi tempus vel. Etiam vitae velit eget massa scelerisque hendrerit cursus vel justo. Sed eget euismod lectus. Morbi tincidunt diam ac diam tempor molestie. Mauris eget lectus leo. Etiam id porta turpis.</p>

	<p>Aenean ac pellentesque ante. In hac habitasse platea dictumst. Nullam efficitur, dolor ac pharetra iaculis, sem elit maximus ex, et malesuada est ipsum tempor nisi. Phasellus auctor et turpis ultrices fermentum. Mauris ac orci sapien. Quisque auctor, mi eu vestibulum dictum, nisl felis pulvinar dui, non dictum justo tellus a urna. Morbi suscipit et odio a feugiat. Sed dui nisi, iaculis a lacus posuere, dictum laoreet felis. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.</p>

	<p>Nam pulvinar congue condimentum. Pellentesque fringilla ante sed massa tincidunt feugiat. Nulla bibendum est eros, non malesuada dolor vehicula in. Morbi eu cursus arcu. Phasellus ultricies ornare lorem, non interdum orci condimentum eu. Donec condimentum condimentum ligula ut placerat. Vestibulum id neque condimentum, molestie nunc vel, suscipit turpis. Quisque orci velit, mattis et nibh non, tempor finibus erat. Nullam tristique, tortor non commodo cursus, magna turpis rhoncus leo, quis porta quam ante sed orci. Nunc vehicula imperdiet leo in vulputate. Quisque quis dolor orci.</p>

	<p>Curabitur ultrices fringilla libero sit amet porta. Nulla rhoncus venenatis euismod. Praesent non interdum sem. Nunc in nibh tincidunt, faucibus sem at, finibus turpis. Nullam vel odio blandit, tincidunt urna et, luctus lectus. Vivamus porta sem vitae turpis interdum porta eu id ligula. Fusce non nisi fringilla, malesuada metus ut, imperdiet ligula. Nunc quis lorem nibh. Duis pharetra magna vestibulum metus convallis, id mollis ligula vulputate. Sed purus est, consectetur non suscipit sit amet, hendrerit at dolor. Maecenas feugiat, quam vel ullamcorper feugiat, sapien ipsum viverra justo, id cursus metus nisi quis enim.</p>
	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mattis turpis eu neque tincidunt lacinia. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam auctor ultrices tortor et volutpat. Donec eu semper orci, eu fermentum orci. Vivamus aliquam lobortis egestas. Proin vel mauris vitae sem auctor cursus. Aenean sit amet odio at magna pharetra luctus nec eget urna. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Praesent in leo at tellus ultricies laoreet.</p>

	<p>Duis nec nisi a eros dictum euismod nec non enim. Donec augue neque, aliquam id finibus a, volutpat ut ligula. Nam feugiat odio elit, ut molestie mi tempus vel. Etiam vitae velit eget massa scelerisque hendrerit cursus vel justo. Sed eget euismod lectus. Morbi tincidunt diam ac diam tempor molestie. Mauris eget lectus leo. Etiam id porta turpis.</p>

	<p>Aenean ac pellentesque ante. In hac habitasse platea dictumst. Nullam efficitur, dolor ac pharetra iaculis, sem elit maximus ex, et malesuada est ipsum tempor nisi. Phasellus auctor et turpis ultrices fermentum. Mauris ac orci sapien. Quisque auctor, mi eu vestibulum dictum, nisl felis pulvinar dui, non dictum justo tellus a urna. Morbi suscipit et odio a feugiat. Sed dui nisi, iaculis a lacus posuere, dictum laoreet felis. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.</p>

	<p>Nam pulvinar congue condimentum. Pellentesque fringilla ante sed massa tincidunt feugiat. Nulla bibendum est eros, non malesuada dolor vehicula in. Morbi eu cursus arcu. Phasellus ultricies ornare lorem, non interdum orci condimentum eu. Donec condimentum condimentum ligula ut placerat. Vestibulum id neque condimentum, molestie nunc vel, suscipit turpis. Quisque orci velit, mattis et nibh non, tempor finibus erat. Nullam tristique, tortor non commodo cursus, magna turpis rhoncus leo, quis porta quam ante sed orci. Nunc vehicula imperdiet leo in vulputate. Quisque quis dolor orci.</p>

	<p>Curabitur ultrices fringilla libero sit amet porta. Nulla rhoncus venenatis euismod. Praesent non interdum sem. Nunc in nibh tincidunt, faucibus sem at, finibus turpis. Nullam vel odio blandit, tincidunt urna et, luctus lectus. Vivamus porta sem vitae turpis interdum porta eu id ligula. Fusce non nisi fringilla, malesuada metus ut, imperdiet ligula. Nunc quis lorem nibh. Duis pharetra magna vestibulum metus convallis, id mollis ligula vulputate. Sed purus est, consectetur non suscipit sit amet, hendrerit at dolor. Maecenas feugiat, quam vel ullamcorper feugiat, sapien ipsum viverra justo, id cursus metus nisi quis enim.</p>
	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mattis turpis eu neque tincidunt lacinia. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam auctor ultrices tortor et volutpat. Donec eu semper orci, eu fermentum orci. Vivamus aliquam lobortis egestas. Proin vel mauris vitae sem auctor cursus. Aenean sit amet odio at magna pharetra luctus nec eget urna. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Praesent in leo at tellus ultricies laoreet.</p>

	<p>Duis nec nisi a eros dictum euismod nec non enim. Donec augue neque, aliquam id finibus a, volutpat ut ligula. Nam feugiat odio elit, ut molestie mi tempus vel. Etiam vitae velit eget massa scelerisque hendrerit cursus vel justo. Sed eget euismod lectus. Morbi tincidunt diam ac diam tempor molestie. Mauris eget lectus leo. Etiam id porta turpis.</p>

	<p>Aenean ac pellentesque ante. In hac habitasse platea dictumst. Nullam efficitur, dolor ac pharetra iaculis, sem elit maximus ex, et malesuada est ipsum tempor nisi. Phasellus auctor et turpis ultrices fermentum. Mauris ac orci sapien. Quisque auctor, mi eu vestibulum dictum, nisl felis pulvinar dui, non dictum justo tellus a urna. Morbi suscipit et odio a feugiat. Sed dui nisi, iaculis a lacus posuere, dictum laoreet felis. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.</p>

	<p>Nam pulvinar congue condimentum. Pellentesque fringilla ante sed massa tincidunt feugiat. Nulla bibendum est eros, non malesuada dolor vehicula in. Morbi eu cursus arcu. Phasellus ultricies ornare lorem, non interdum orci condimentum eu. Donec condimentum condimentum ligula ut placerat. Vestibulum id neque condimentum, molestie nunc vel, suscipit turpis. Quisque orci velit, mattis et nibh non, tempor finibus erat. Nullam tristique, tortor non commodo cursus, magna turpis rhoncus leo, quis porta quam ante sed orci. Nunc vehicula imperdiet leo in vulputate. Quisque quis dolor orci.</p>

	<p>Curabitur ultrices fringilla libero sit amet porta. Nulla rhoncus venenatis euismod. Praesent non interdum sem. Nunc in nibh tincidunt, faucibus sem at, finibus turpis. Nullam vel odio blandit, tincidunt urna et, luctus lectus. Vivamus porta sem vitae turpis interdum porta eu id ligula. Fusce non nisi fringilla, malesuada metus ut, imperdiet ligula. Nunc quis lorem nibh. Duis pharetra magna vestibulum metus convallis, id mollis ligula vulputate. Sed purus est, consectetur non suscipit sit amet, hendrerit at dolor. Maecenas feugiat, quam vel ullamcorper feugiat, sapien ipsum viverra justo, id cursus metus nisi quis enim.</p>
</div>
!

CSS 

              
                #sticky-parallax-header {
	color: #fff;
	height: 100vh;
	width: 100%;
	background-image: url("https://source.unsplash.com/tZpmdFfU5gQ");
	background-size: cover;
	background-position: 50% 50%;
	background-blend-mode: soft-light;

	display: grid;
	place-items: center;
	text-align: center;
	font-size: calc(4vw + 1em);
}

#content {
	padding-top: 1em;
	margin: 0 auto 0;
	width: 80vw;
	max-width: 60em;
}

html,
body {
	margin: 0;
	padding: 0;
	background: #fff;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

.warning, .info {
	padding: 1em;
	border: 1px solid #ccc;
	background: rgba(255 255 205 / 0.8);
	display: none;
}

.info {
	display: block;
	background: transparent;
}

.warning p,
.info p {
	margin: 0;
	padding: 0;
}

.info p + p {
	margin-top: 1.2em;
}

* {
	box-sizing: border-box;
}
!

JS 

              
                import { showDialog } from 'https://codepen.io/bramus/pen/ZEqMOLz/cccfe67c2b9cdfbeb5fb59083dbd0a64.js';
showDialog();

// Alternative Versions:
// - JS ScrollTimeline 2022 + Polyfill: https://codepen.io/bramus/pen/VwXMRrW 👈 = The version you are currently looking at
// - CSS scroll-timeline 2022 + Polyfill: 
// - JS Motion One: https://codepen.io/bramus/pen/PoRKORX
// - Old CSS @scroll-timeline 2021 + Polyfill: https://codepen.io/bramus/pen/ExgOPRw

// The one from https://github.com/flackr/scroll-timeline/pull/74
import "https://raw.githack.com/flackr/scroll-timeline/22ae0525a8044a54e6d0aa593695b2a042e8de2a/dist/scroll-timeline.js";

// Some elements we'll need
const $header = document.querySelector("#sticky-parallax-header");
const $content = document.querySelector("#content");

// Fixate the header
// @note: We use `position: fixed` instead of `position: sticky` here because
// the latter glitches — https://bugs.chromium.org/p/chromium/issues/detail?id=1167497
$header.style.position = 'fixed';
$header.style.top = 0;

// As we use `position: fixed` above, we also have to make sure the content
// is not underneath the header. With `position: sticky` this would be of no issue.
$content.style.marginTop = `100vh`;

// 1️⃣ Compared to the previous version of the spec, we no longer have offsets in
// ScrollTimeline. Because of that, the code below won’t work:
//
// 		$header.animate(
// 			{
// 				backgroundPosition: ["50% 0", "50% 100%"], 
// 				backgroundColor: ['transparent', '#0b1584'],
// 				height: ['100vh', `10vh`],
// 				fontSize: ['calc(4vw + 1em)', 'calc(1vw + 1em)'],
// 			},
//		 	{
// 				timeline: new ScrollTimeline({
// 					subject: document.documentElement,
// 					offset: ["0vh", "90vh"], // 👈 This was easy.
// 				})
// 			}
// 		);

// 2️⃣ Alternative, using a ViewTimeline to watch the $header slide out of view also 
// does not work, as the element remains in place

// 3️⃣ Flippping things around, we can watch $content as it enters to get it working.
// 
// This approach isn’t always possible though;
// 1. What if there is no succeeding element to track?
// 2. Even if there is one, it would break componentization: I would want this header
//    to be a standalond component
// 3. Only works here because we are animating over 90vh, which happens to map to 90%
// 4. The element that is entering needs to be taller than the scrollport for `enter` to work for it.
$header.animate(
	{
		backgroundPosition: ["50% 0", "50% 100%"], 
		backgroundColor: ['transparent', '#0b1584'],
		height: ['100vh', `10vh`],
		fontSize: ['calc(4vw + 1em)', 'calc(1vw + 1em)'],
	},
	{
		timeline: new ViewTimeline({
			subject: $content,
			axis: 'vertical'
		}),
		fill: 'forwards',
		delay: { phase: "enter", percent: CSS.percent(0) },
		endDelay: { phase: "enter", percent: CSS.percent(90) }
	}
);
!
999px

Console