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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/spanner-in-opacity-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<p>Test passes if there is a purple square below.</p>
<div style="width:100px; background:blue;">
  <div style="opacity:0.5;">
    <div style="height:100px; background:red;"></div>
  </div>
</div>