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HTML

              
                <!-- @TODO: Move away from custom props before injecting the polyfill, as it can't handle it -->
<input type="checkbox" id="debug" />

<header>
	<div>
		<h1>Stacking Cards</h1>
		<p>πŸ‘‡ Scroll down to see the effect.</p>
	</div>
</header>
<main>
	<ul id="cards">
		<li class="card" id="card_1">
			<div class="card__content">
				<div>
					<h2>Card One</h2>
					<p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
					<p><a href="#top" class="btn btn--accent">Read more</a></p>
				</div>
				<figure>
					<img src="https://codyhouse.co/demo-tutorials/stacking-cards/assets/img/img-1.jpg" alt="Image description">
				</figure>
			</div>
		</li>
		<li class="card" id="card_2">
			<div class="card__content">
				<div>
					<h2>Card Two</h2>
					<p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
					<p><a href="#top" class="btn btn--accent">Read more</a></p>
				</div>
				<figure>
					<img src="https://codyhouse.co/demo-tutorials/stacking-cards/assets/img/img-2.jpg" alt="Image description">
				</figure>
			</div>
		</li>
		<li class="card" id="card_3">
			<div class="card__content">
				<div>
					<h2>Card Three</h2>
					<p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
					<p><a href="#top" class="btn btn--accent">Read more</a></p>
				</div>
				<figure>
					<img src="https://codyhouse.co/demo-tutorials/stacking-cards/assets/img/img-3.jpg" alt="Image description">
				</figure>
			</div>
		</li>
		<li class="card" id="card_4">
			<div class="card__content">
				<div>
					<h2>Card Four</h2>
					<p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
					<p><a href="#top" class="btn btn--accent">Read more</a></p>
				</div>
				<figure>
					<img src="https://codyhouse.co/demo-tutorials/stacking-cards/assets/img/img-2.jpg" alt="Image description">
				</figure>
			</div>
		</li>
	</ul>
</main>
<aside>
	<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Rem repellat non ratione eum provident quaerat obcaecati dicta autem voluptates sit cum quis distinctio, atque sint commodi reprehenderit perspiciatis iure velit molestiae eos molestias ipsa nihil quia? Porro tempore in fugit, aspernatur et temporibus aliquam magnam adipisci deleniti dicta repellat alias nostrum impedit quidem odit excepturi nam. Itaque numquam unde quae dignissimos exercitationem placeat, ipsa amet tempora vitae ullam animi! Hic asperiores in esse atque expedita dolorem officia illo commodi fugit earum ab, assumenda optio, sed repellat. Maiores laudantium reprehenderit suscipit accusamus assumenda, debitis nemo ut sapiente numquam doloremque alias explicabo minus autem harum illum dicta. Unde obcaecati inventore repellat id eligendi eaque, rerum aliquam maiores aspernatur cumque tenetur quo qui mollitia atque quasi voluptate ipsum neque explicabo voluptatem quibusdam beatae quae iste vero doloribus! Natus libero quibusdam molestias harum atque, assumenda doloribus quis, quam corporis, voluptas suscipit magni! Enim sapiente totam consequatur repellat maxime placeat perferendis iste maiores soluta, obcaecati incidunt expedita eius cumque ipsa quo sed. Minus distinctio culpa cumque labore nulla laborum ex, explicabo magni mollitia eaque aliquam vero blanditiis quae, id necessitatibus error voluptas harum tempora sint porro. Facilis beatae quasi soluta et ipsum suscipit repellendus inventore.</p>
	
	<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Possimus, ipsam molestias. Fuga similique, dolor tempora rerum perferendis ipsam ullam doloribus beatae esse facilis quae sit excepturi expedita non, sunt accusantium magnam? Animi nesciunt nostrum eligendi iusto voluptatum hic qui. Quod distinctio qui nobis et doloremque. Fuga, itaque? Laborum dignissimos nobis quaerat optio voluptatum similique unde, neque cupiditate, vel, fugiat dolore? Accusantium neque deserunt ducimus enim, illum laborum magni ipsam eos optio aspernatur nam necessitatibus quod natus, dolor laboriosam illo velit.</p>
	<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Rem repellat non ratione eum provident quaerat obcaecati dicta autem voluptates sit cum quis distinctio, atque sint commodi reprehenderit perspiciatis iure velit molestiae eos molestias ipsa nihil quia? Porro tempore in fugit, aspernatur et temporibus aliquam magnam adipisci deleniti dicta repellat alias nostrum impedit quidem odit excepturi nam. Itaque numquam unde quae dignissimos exercitationem placeat, ipsa amet tempora vitae ullam animi! Hic asperiores in esse atque expedita dolorem officia illo commodi fugit earum ab, assumenda optio, sed repellat. Maiores laudantium reprehenderit suscipit accusamus assumenda, debitis nemo ut sapiente numquam doloremque alias explicabo minus autem harum illum dicta. Unde obcaecati inventore repellat id eligendi eaque, rerum aliquam maiores aspernatur cumque tenetur quo qui mollitia atque quasi voluptate ipsum neque explicabo voluptatem quibusdam beatae quae iste vero doloribus! Natus libero quibusdam molestias harum atque, assumenda doloribus quis, quam corporis, voluptas suscipit magni! Enim sapiente totam consequatur repellat maxime placeat perferendis iste maiores soluta, obcaecati incidunt expedita eius cumque ipsa quo sed. Minus distinctio culpa cumque labore nulla laborum ex, explicabo magni mollitia eaque aliquam vero blanditiis quae, id necessitatibus error voluptas harum tempora sint porro. Facilis beatae quasi soluta et ipsum suscipit repellendus inventore.</p>
	
	<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Possimus, ipsam molestias. Fuga similique, dolor tempora rerum perferendis ipsam ullam doloribus beatae esse facilis quae sit excepturi expedita non, sunt accusantium magnam? Animi nesciunt nostrum eligendi iusto voluptatum hic qui. Quod distinctio qui nobis et doloremque. Fuga, itaque? Laborum dignissimos nobis quaerat optio voluptatum similique unde, neque cupiditate, vel, fugiat dolore? Accusantium neque deserunt ducimus enim, illum laborum magni ipsam eos optio aspernatur nam necessitatibus quod natus, dolor laboriosam illo velit.</p>
	<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Rem repellat non ratione eum provident quaerat obcaecati dicta autem voluptates sit cum quis distinctio, atque sint commodi reprehenderit perspiciatis iure velit molestiae eos molestias ipsa nihil quia? Porro tempore in fugit, aspernatur et temporibus aliquam magnam adipisci deleniti dicta repellat alias nostrum impedit quidem odit excepturi nam. Itaque numquam unde quae dignissimos exercitationem placeat, ipsa amet tempora vitae ullam animi! Hic asperiores in esse atque expedita dolorem officia illo commodi fugit earum ab, assumenda optio, sed repellat. Maiores laudantium reprehenderit suscipit accusamus assumenda, debitis nemo ut sapiente numquam doloremque alias explicabo minus autem harum illum dicta. Unde obcaecati inventore repellat id eligendi eaque, rerum aliquam maiores aspernatur cumque tenetur quo qui mollitia atque quasi voluptate ipsum neque explicabo voluptatem quibusdam beatae quae iste vero doloribus! Natus libero quibusdam molestias harum atque, assumenda doloribus quis, quam corporis, voluptas suscipit magni! Enim sapiente totam consequatur repellat maxime placeat perferendis iste maiores soluta, obcaecati incidunt expedita eius cumque ipsa quo sed. Minus distinctio culpa cumque labore nulla laborum ex, explicabo magni mollitia eaque aliquam vero blanditiis quae, id necessitatibus error voluptas harum tempora sint porro. Facilis beatae quasi soluta et ipsum suscipit repellendus inventore.</p>
	
	<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Possimus, ipsam molestias. Fuga similique, dolor tempora rerum perferendis ipsam ullam doloribus beatae esse facilis quae sit excepturi expedita non, sunt accusantium magnam? Animi nesciunt nostrum eligendi iusto voluptatum hic qui. Quod distinctio qui nobis et doloremque. Fuga, itaque? Laborum dignissimos nobis quaerat optio voluptatum similique unde, neque cupiditate, vel, fugiat dolore? Accusantium neque deserunt ducimus enim, illum laborum magni ipsam eos optio aspernatur nam necessitatibus quod natus, dolor laboriosam illo velit.</p>
</aside>
	
	<div class="warning">
		<p>⚠️ Your browser does not support Scroll-Linked Animations with JS <code>ViewTimeline</code>. To make this demo work in your browser, <a href="https://github.com/flackr/scroll-timeline">a polyfill</a> has been loaded.</p>
		<p>🚨 Note that <b>this demo loads a version of the polyfill that diverges from the spec</b>: it calculates the phases differently. It’s only because of this that this demo actually works.</p>
	</div>
              
            
!

CSS

              
                :root {
	--card-height: 40vw;
	--card-margin: 4vw;
	--card-top-offset: 1em;
	--numcards: 4;
	--outline-width: 0px;
}

#cards {
	padding-bottom: calc(var(--numcards) * var(--card-top-offset)); /* Make place at bottom, as items will slide to that position*/
	margin-bottom: var(--card-margin); /* Don't include the --card-margin in padding, as that will affect the scroll-timeline*/
}

.card {
	position: sticky;
	top: 0;
	padding-top: var(--card-top-offset);
	transform-origin: 50% 0%;
	will-change: transform;
}


/** DEBUG **/

#debug {
  position: fixed;
  top: 1em;
  left: 1em;
}
#debug::after {
  content: " Show Debug";
  margin-left: 1.5em;
  color: white;
  white-space: nowrap;
}

#debug:checked ~ main {
  --outline-width: 1px;
}


/** PAGE STYLING **/

* { /* Poor Man's Reset */
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	background: rgb(58 29 43);
	color: rgb(255, 255, 255);
	text-align: center;

	font-size: calc(1em + 0.5vw);
}

header,
main {
	width: 80vw;
	margin: 0 auto;
}

header {
	height: 100vh;
	display: grid;
	place-items: center;
}

#cards {
	list-style: none;
	outline: calc(var(--outline-width) * 10) solid blue;
	
	display: grid;
	grid-template-columns: 1fr;
	grid-template-rows: repeat(var(--numcards), var(--card-height));
	gap: var(--card-margin);
}

.card {
	outline: var(--outline-width) solid hotpink;
}

.card__content {
	box-shadow: 0 0.2em 1em rgba(0, 0, 0, 0.1), 0 1em 2em rgba(0, 0, 0, 0.1);
	background: rgb(255, 255, 255);
	color: rgb(10, 5, 7);
	border-radius: 1em;
	overflow: hidden;

	display: grid;
	grid-template-areas: "text img";
	grid-template-columns: 1fr 1fr;
	grid-template-rows: auto;

	align-items: stretch;
	outline: var(--outline-width) solid lime;
}

.card__content > div {
	grid-area: text;
	width: 80%;
	place-self: center;
	text-align: left;

	display: grid;
	gap: 1em;
	place-items: start;
}

.card__content > figure {
	grid-area: img;
	overflow: hidden;
}

.card__content > figure > img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

h1 {
	font-weight: 300;
	font-size: 3.5em;
}

h2 {
	font-weight: 300;
	font-size: 2.5em;
}

p {
	font-family: sans-serif;
	font-weight: 300;
	line-height: 1.42;
}

.btn {
	background: rgb(188 87 36);
	color: rgb(255 255 255);
	text-decoration: none;
	display: inline-block;
	padding: 0.5em;
	border-radius: 0.25em;
}

aside {
	width: 50vw;
	margin: 0 auto;
	text-align: left;
}

aside p {
	margin-bottom: 1em;
}

/* Show warning for older browser */
.warning {
	position: fixed;
	bottom: 1em;
	right: 1em;
	left: 1em;
	padding: 1em;
	border: 1px solid black;
	z-index: 9999;
	text-align: center;
	color: black;
	background: rgba(255 255 225 / 0.9);
}

.warning a {
	color: blue;
}

.warning > :first-child {
	margin-top: 0;
}

.warning > :last-child {
	margin-bottom: 0;
}

.warning a {
	color: blue;
}
.warning--info {
	border: 1px solid #123456;
	background: rgb(205 230 255 / 0.8);
}
.warning--alarm {
	border: 1px solid red;
	background: #fff1f1;
}
              
            
!

JS

              
                // Alternative Versions:
// - Vanilla JS Version: https://codyhouse.co/demo-tutorials/stacking-cards/index.html
// - CSS @scroll-timeline: https://codepen.io/bramus/pen/PobmGme
// - JS ScrollTimeline Polyfill: https://codepen.io/bramus/pen/XWEeGZm πŸ‘ˆ = The version you are currently looking at
// - JS Motion One: https://codepen.io/bramus/pen/rNdzpZK

// This uses an old version of the polyfill, one that calculates the phases wrong (but which makes this demo work)
import "https://rawcdn.githack.com/flackr/scroll-timeline/ca40d920073ab1c3775f6e2aa973c6ea747ae664/dist/scroll-timeline.js";

const $cardsWrapper = document.querySelector('#cards');
const $cards = document.querySelectorAll('.card');

const numCards = $cards.length;

// Each card should only shrink when it’s at the top.
// We can’t use exit on the els for this (as they are sticky)
// but can track $cardsWrapper instead.
const viewTimeline = new ViewTimeline({
	subject: $cardsWrapper,
	axis: 'block',
});

$cards.forEach(($card, index0) => {
	
	const index = index0 + 1;
	const reverseIndex = numCards - index0;
	const reverseIndex0 = numCards - index;

	// Extra padding per card, so you can see the other stacked cards underneath at the top
	$card.style.paddingTop = `calc(${index} * var(--card-top-offset))`;
	
	// Scroll-Linked Animation
	$card.animate(
		{
			// Earlier cards shrink more than later cards
			transform: [ `scale(1)`, `scale(${1 - (0.1 * reverseIndex0)}`],
		},
		{
			timeline: viewTimeline,
			fill: 'forwards',
			// timeRange: `exit ${index0 / numCards * 100}% ${index / numCards * 100}%`,
			delay: { phase: "exit", percent: CSS.percent(index0 / numCards * 100) },
			endDelay: { phase: "exit", percent: CSS.percent(index / numCards * 100) },
			// delay: { phase: "contain", percent: CSS.percent(0) },
			// endDelay: { phase: "exit", percent: CSS.percent(100) },
			// timeRange: 'exit 0% 100%'
		}
	);
});
              
            
!
999px

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