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chromium/third_party/blink/web_tests/fragmentation/class-c-break-after-clearance.html 

<!DOCTYPE html>
<script src="../resources/check-layout.js"></script>
<p>There should be a blue square below.</p>
<div id="multicol" style="position:relative; columns:3; column-fill:auto; column-gap:0; width:180px; height:100px; line-height:20px;">
    <br>
    <br>
    <div style="float:left; width:50px; height:50px;"></div>
    <div style="background:blue;" data-offset-x="0" data-offset-y="40" data-expected-height="80">
        <div data-offset-x="60" data-offset-y="0" data-expected-height="20" style="clear:both; background:white;">
            <br>
        </div>
    </div>
</div>
<script>
    checkLayout("#multicol");
</script>