File: anchor-scroll-composited-scrolling-006-ref.html

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thunderbird 1%3A140.4.0esr-1
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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>