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chromium/third_party/blink/web_tests/fast/multicol/balance-floats.html 

<!DOCTYPE html>
<script src="../../resources/check-layout.js"></script>
<p>The word "YO" (with large letter spacing) should be seen below. There should also be a tiny
    blue <em>square</em>. And there should be no crash or assertion failure.</p>
<div id="multicol" style="position:relative; -webkit-column-count:2; -webkit-column-gap:0; width:40px; line-height:40px; background:blue;" data-expected-height="100">
    <div style="float:left; width:100%; height:80px; background:papayawhip;">Y</div>
    <div style="float:left; width:100%; height:100px; background:papayawhip;" data-offset-y="0">O</div>
</div>
<script>
    checkLayout("#multicol");
</script>