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chromium/third_party/blink/web_tests/fast/multicol/line-pushed-down-by-float.html 

<!DOCTYPE html>
<p>Test that a line pushed down by a float doesn't pull the float to the next column if it has to break.</p>
<div style="-webkit-columns:2; -webkit-column-gap:1em; column-fill:auto; width:51em; height:10em; line-height:2em; orphans:1; widows:1; background:yellow;">
    First column.<br>
    <div>
        <div style="float:left; width:100%; height:7em; background:cyan;">
            This cyan block should all be in the first column.
        </div>
        Second column.
    </div>
</div>