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<!DOCTYPE html>
<title>Scroll timeline with WorkletAnimation using a scroller with overflow hidden</title>
<style>
#box {
width: 100px;
height: 100px;
background-color: green;
transform: translate(0, 100px);
opacity: 0.5;
will-change: transform; /* force compositing */
}
#covered {
width: 100px;
height: 100px;
background-color: red;
}
#scroller {
overflow: hidden;
height: 100px;
width: 100px;
will-change: transform; /* force compositing */
}
#contents {
height: 1000px;
width: 100%;
}
</style>
<div id="box"></div>
<div id="covered"></div>
<div id="scroller">
<div id="contents"></div>
</div>
<script>
window.addEventListener('load', function() {
// Move the scroller to halfway.
const scroller = document.getElementById("scroller");
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.5 * maxScroll;
});
</script>
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