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chromium/third_party/blink/web_tests/external/wpt/css/CSS2/stacking-context/opacity-affects-block-in-inline.html 

<!DOCTYPE html>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=884236">
<link rel="match" href="opacity-affects-block-in-inline-ref.html">
<span style="opacity: 0.5;">
  <div style="width: 100px; height: 100px; background: green;"></div>
</span>