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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-scroll-to-sticky-002.html 

<!DOCTYPE html>
<title>Tests scroll adjustments of element anchored to a sticky-position element</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="match" href="reference/anchor-scroll-to-sticky-002-ref.html">
<style>
body {
  margin: 0;
}

div {
  width: 100px;
  height: 100px;
}

#scroller {
  overflow: scroll;
  position: relative;
}

#anchor {
  anchor-name: --a1;
  position: sticky;
  top: 0;
  height: 20px;
  background: orange;
}

#anchored {
  position: absolute;
  position-anchor: --a1;
  left: anchor(left);
  top: anchor(bottom);
  background: green;
}

</style>

<!-- Anchored to sibling sticky-positioned. -->
<div id="scroller">
  <div style="height: 50px"></div>
  <div id="anchor"></div>
  <div style="height: 300px"></div>
  <div id="anchored"></div>
</div>

<script>
scroller.scrollTop = 200;
</script>