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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-multicol.html 

<!doctype html>
<title>fieldset multicol</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
 #test { margin: 0; padding: 0; border: none }
 #test, #ref { columns: 5 }
 p { margin: 0 }
</style>
<fieldset id=test>
  <p>1
  <p>2
  <p>3
  <p>4
  <p>5
</fieldset>
<div id=ref>
  <p>1
  <p>2
  <p>3
  <p>4
  <p>5
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(document.getElementById('test')).height,
                  getComputedStyle(document.getElementById('ref')).height);
  });
</script>