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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-position-dynamic-005.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<style>
  #cb {
    position: relative;
    width: 100px;
    height: 100px;
    overflow: clip;
  }
  #anchor {
    position: absolute;
    inset: 0;
    background: green;
    width: 100px;
    height: 100px;
    anchor-name: --a;
  }
  #bug {
    position: absolute;
    width: 100px;
    height: 100px;
    background: red;
    left: anchor(right);
    top: anchor(top);
    position-anchor: --a;
  }
  #target {
    position: absolute;
    top: anchor(top);
  }
</style>
<p>Test passes if there is a filled green square.</p>
<div id="cb">
  <div id="anchor"></div>
  <div>
    <div id=bug></div>
  </div>
  <div id=target></div>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.top = 'calc(anchor(top) + 10px)';
</script>