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chromium/third_party/blink/web_tests/fast/multicol/multicol-becomes-regular-block-expected.html 

<!DOCTYPE html>
<p>There should be a blue <em>square</em> below.</p>
<div id="elm" style="width:16em; line-height:4em; background:blue;">
    <br>
    <br>
    <br>
    <br>
</div>