Scroll Driven Animations Scroll Detection

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</head>
<body>
<ul class="titles transparent">
	<li>One</li>
	<li>Two</li>
	<li>Three</li>
	<li>Four</li>
	<li>Five</li>
	<li>Six</li>
	<li>Seven</li>
	<li>Eight</li>
</ul>
<ul class="titles fill">
	<li>One</li>
	<li>Two</li>
	<li>Three</li>
	<li>Four</li>
	<li>Five</li>
	<li>Six</li>
	<li>Seven</li>
	<li>Eight</li>
</ul>
<div class="panels">
	<div class="panel"><img src="https://picsum.photos/seed/1/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/2/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/3/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/4/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/5/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/6/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/7/1600/900" alt="photo" height="900" width="1600"></div>
	<div class="panel"><img src="https://picsum.photos/seed/8/1600/900" alt="photo" height="900" width="1600"></div>
</div>

<div class="warning">
	<p>⚠️ Your browser does not support CSS Scroll-Linked Animations with <code>view-timeline</code>. Please use Chrome Canary 115+ to check out this demo.</p>
</div>
  
</body>
</html>

CSS

@property --scroll-position {
	syntax: "<number>";
	inherits: true;
	initial-value: 0;
}
@property --scroll-position-delayed {
	syntax: "<number>";
	inherits: true;
	initial-value: 0;
}

@keyframes adjust-pos {
	to {
		--scroll-position: 1;
		--scroll-position-delayed: 1;
	}
}

:root {
	animation: adjust-pos 0.01s linear both;
	animation-timeline: scroll(root);
}

body {
	transition: --scroll-position-delayed 0.15s linear;
	--scroll-velocity: calc(
		var(--scroll-position) - var(--scroll-position-delayed)
	);
}

html {
	background: #666;
}

html {
	scroll-snap-type: y mandatory;
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

ul {
	list-style: none;
	pointer-events: none;
	line-height: 1;
	display: block;
}
ul li {
	display: block;
	line-height: 1;
}
.panel {
	scroll-snap-align: center;
	height: 100dvh;
	border: 2px solid #333;
	background: rgb(0 0 0 / 0.15);
	z-index: -1;
}

.panel img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	filter: brightness(30%);
}

@keyframes slide-up {
	to {
		translate: 0 var(--end-pos);
	}
}

.titles {
	position: fixed;
	z-index: 2;
	top: 50dvh;
	font-size: 25dvh;
	left: 0;
	right: 0;
	text-align: center;

animation: slide-up 0.01s linear;
	animation-timeline: scroll(root block);

font-family: impact;
	text-transform: uppercase;
	letter-spacing: 1px;

--num-children: 8;
	--num-children-1: calc(var(--num-children) - 1);
	--size-per-child: calc(100% / var(--num-children));

--half-size-per-child: calc(var(--size-per-child) / 2);
	--start-pos: calc(var(--half-size-per-child) * -1);
	--end-pos: calc(-100% + var(--half-size-per-child));
	translate: 0 var(--start-pos);
}

.titles.transparent {
	color: transparent;
	-webkit-text-stroke: 1px rgb(255 255 255 / 0.7);
	text-stroke: 1px rgb(255 255 255 / 0.7);
}

.titles.fill {
	color: hotpink;

--y-per-child: calc(1 / var(--num-children));
	--cur-child: calc((var(--scroll-position) / var(--y-per-child)) + 1);
	--cur-child-1: calc(var(--cur-child) - 1);

--clip-min: 0;
	--clip-max: calc(100% - var(--size-per-child));
	--clip-per-child: calc(var(--clip-max) / var(--num-children));
	--fix: calc(
		var(--clip-per-child) / 8
	);
	--extra: 1%;
	clip-path: inset(
		calc((var(--cur-child-1) * var(--clip-per-child)) - var(--extra)) 0%
			calc(
				(100% - (var(--cur-child) * var(--clip-per-child)) - var(--fix)) -
					var(--extra)
			)
			0%
	);
}

.titles li {
	will-change: transform;
	transform-origin: 50% 50%;
	transform: skewY(calc(var(--scroll-velocity) * -75deg));
}

.warning {
	border: 1px solid black;
	z-index: 9999;
	color: black;
	background: rgba(255 255 225 / 0.9);
	z-index: 1;

position: fixed;
	top: 1em;
	left: 1em;
	right: 1em;
	text-align: center;
}

.warning p {
	margin: 1em 0;
}
@supports (view-timeline: --works) {
	.warning {
		display: none;
	}
}

Scroll Driven Animations Scroll Detection

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