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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/dynamic-baseline-change.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#baseline-participation">
<link rel="match" href="dynamic-baseline-change-ref.html">
<meta name="assert" content="This test ensures proper baseline alignment for a sub-tree which adds a scrollbar.">
<div style="display: flex; width: 100px; border: solid; align-items: baseline;">
  <div style="width: 50px; height: 50px; position: relative; overflow: auto;">
    <canvas width=10 height=10 style="width: 80%; background: green;"></canvas> <!-- Baseline of the canvas will move when a scrollbar is added. -->
    <div id="target" style="position: absolute; width: 10px; height: 10px; background: red; top: 0;"></div>
  </div>
  <div style="width: 50px; height: 50px; background: green;"></div> <!-- Baseline is synthesized at the block-end edge. -->
</div>
<script>
  document.body.offsetTop;
  document.getElementById('target').style.top = '100px';
</script>