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<!DOCTYPE html>
<style>
#cb {
position: absolute;
inset: 0;
}
#scroller {
margin-top: 300px;
overflow-y: scroll;
height: 100px;
}
#spacer { height: 300px; }
#anchor { anchor-name: --a; }
#anchored {
position: absolute;
width: 100px;
height: 100px;
background-color: green;
top: 100px;
left: 0;
}
</style>
<div id="cb">
<div id="scroller">
<div id="anchor"></div>
<div id="spacer"></div>
</div>
<div id="anchored"></div>
</div>
<script>
const scroller = document.getElementById('scroller');
scroller.scrollTop = 200;
</script>