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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<p>There should be a purple square below.</p>
<div style="width:100px; height:100px; background:blue;">
<div style="opacity:0.5;">
<div style="width:100px; height:100px; background:red;"></div>
</div>
</div>