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chromium/third_party/blink/web_tests/fast/multicol/float-margin-at-row-boundary-fixed-multicol-height.html 

<!DOCTYPE html>
<p>There should be a hotpink square below.</p>
<div style="columns:2; column-fill:auto; column-gap:0; width:100px; height:90px;">
    <div style="margin-top:30px; margin-left:auto; width:20px; height:40px; background:hotpink;"></div>
    <div style="columns:4; column-fill:auto; height:100px;">
        <div style="float:left; margin-top:30px; width:20px; height:40px; break-inside:avoid; background:hotpink;"></div>
    </div>
</div>