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<!DOCTYPE html>
<style>
body {
margin: 0;
}
#scroller {
width: 200px;
height: 100px;
overflow: scroll;
will-change: scroll-position;
}
#spacer {
height: 400px;
}
#anchor {
width: 100px;
height: 100px;
anchor-name: --a;
}
#overlap {
position: absolute;
width: 100px;
height: 100px;
top: 150px;
left: 0;
z-index: 100;
background: green;
}
</style>
<div id="overlap"></div>
<div id="scroller">
<div id="spacer"></div>
<div id="anchor"></div>
</div>
<script>
scroller.scrollTop = 150;
</script>