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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/multicol-fill-balance-023.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://www.w3.org/TR/css-multicol-1/#cf">
<div id="multicol" style="columns:4;">
  <div style="height:0;">
    <div style="height:20px;"></div>
    <div style="break-before:column; height:10px;"></div>
    <div style="break-before:column; height:10px;"></div>
    <div style="column-span:all; height:10px;"></div>
  </div>
  <div style="height:320px;"></div>
</div>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
    assert_equals(multicol.offsetHeight, 100);
  }, "Spanner in overflowed parent with forced breaks");
</script>