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svelte/documentation/tutorial/16-special-elements/05-svelte-window-bindings/app-a/App.svelte

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<script>
const layers = [0, 1, 2, 3, 4, 5, 6, 7, 8];
let y;
</script>
<svelte:window />
<a class="parallax-container" href="https://www.firewatchgame.com">
{#each layers as layer}
<img
style="transform: translate(0,{(-y * layer) / (layers.length - 1)}px)"
src="https://www.firewatchgame.com/images/parallax/parallax{layer}.png"
alt="parallax layer {layer}"
/>
{/each}
</a>
<div class="text">
<span style="opacity: {1 - Math.max(0, y / 40)}"> scroll down </span>
<div class="foreground">
You have scrolled {y} pixels
</div>
</div>
<style>
.parallax-container {
position: fixed;
width: 2400px;
height: 712px;
left: 50%;
transform: translate(-50%, 0);
}
.parallax-container img {
position: absolute;
top: 0;
left: 0;
width: 100%;
will-change: transform;
}
.parallax-container img:last-child::after {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: rgb(45, 10, 13);
}
.text {
position: relative;
width: 100%;
height: 300vh;
color: rgb(220, 113, 43);
text-align: center;
padding: 4em 0.5em 0.5em 0.5em;
box-sizing: border-box;
pointer-events: none;
}
span {
display: block;
font-size: 1em;
text-transform: uppercase;
will-change: transform, opacity;
}
.foreground {
position: absolute;
top: 711px;
left: 0;
width: 100%;
height: calc(100% - 712px);
background-color: rgb(32, 0, 1);
color: white;
padding: 50vh 0 0 0;
}
:global(body) {
margin: 0;
padding: 0;
background-color: rgb(253, 174, 51);
}
</style>