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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/multicol-fill-balance-028.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:2;">
  <span>
    <div style="float:left; width:100%; height:60px;"></div>
    <div style="clear:left; float:left; width:100%; contain:size; height:40px;"></div>
    <div style="clear:left; float:left; width:100%; height:90px;"></div>
  </span>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
    assert_equals(multicol.offsetHeight, 100);
  }, "Make room for the float in the first column");
</script>