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chromium/third_party/blink/web_tests/fast/block/margin-collapse/self-collapsing-block-with-float-child-collapsed-margins.html 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<body>
<p>The blue box should be stacked on top the black box.</p>
<!-- https://bugs.webkit.org/show_bug.cgi?id=103116 -->
<div style="height: 20px; width:20px; float:left; background: blue;"></div>
<div style="margin-top:5px; margin-bottom: 20px; clear:both;">
    <div style="height: 20px; width:20px; float:left; background: black;"></div>
</div>
</body>