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chromium/third_party/blink/web_tests/external/wpt/css/css-break/overflowing-block-004.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://issues.chromium.org/issues/348445899">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="mc" style="columns:2; width:100px; column-fill:auto; gap:0; height:300px; background:red;">
  <div style="width:50px;">
    <div style="height:15px;">
      <div style="height:200px; background:green;"></div>
    </div>
  </div>
</div>
<script>
  document.body.offsetTop;
  mc.style.height = "100px";
</script>