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chromium/third_party/blink/web_tests/fast/multicol/newmulticol/balance5.html 

<!DOCTYPE html>
<html>
  <head>
    <title>auto-height multicol</title>
    <script src="../../../resources/js-test.js"></script>
    <script>
      if (window.testRunner)
        testRunner.dumpAsText();
    </script>
  </head>
  <body>
    <p>There should be two identical boxes below.</p>
    <div id="mc" style="-webkit-columns:4; columns:4; orphans:1; widows:1; color:olive; background:olive;">
      line<br>
      line<br>
      line<br>
      line<br>
      line<br>
      line<br>
      line<br>
      line<br>
    </div>
    <div id="ref" style="margin-top:1em; color:olive; background:olive;">
      line<br>
      line<br>
    </div>
    <script>
      shouldBe("mc.offsetHeight", "ref.offsetHeight");
    </script>
  </body>
</html>