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chromium/third_party/blink/web_tests/fast/multicol/nested-balancing-with-line-at-exact-top.html 

<!DOCTYPE html>
<script src="../../resources/check-layout.js"></script>
<p>The word BOMBINATE should be seen below.</p>
<div id="outer" style="position:relative; overflow:hidden; -webkit-column-count:2; -webkit-column-gap:0; column-fill:auto; width:500px; height:70px; line-height:20px; orphans:1; widows:1;">
    <div data-expected-height="110" style="-webkit-column-count:2; -webkit-column-gap:0;">
        <div style="height:120px;"></div>
        <br> <!-- last line in second column in first row. Exactly no space left after this. -->
        <br> <!-- first line in first column in second row. -->
        <br> <!-- second line in first column in second row. -->
        <br> <!-- first line in second column in second row. -->
        <br> <!-- second line in second column in second row. -->
    </div>
    <!-- There should be exactly 30px left in the second outer column. -->
    <div data-offset-x="250" data-offset-y="40" style="line-height:30px;">BOMBINATE</div>
</div>
<script>
    checkLayout("#outer");
</script>