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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/balance-grid-001.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1474979">
<div id="container" data-expected-height="83" style="columns:2; width:10em; line-height:20px;">
  1<br>2<br>
  <div style="display:grid; break-inside:avoid;">
    <div style="padding-bottom:3px;">3</div>
    <div>4</div>
  </div>
  5
  <div style="display:grid;">6</div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script>
  checkLayout("#container");
</script>