css/compositing/root-element-opacity.html

<!doctype HTML>
<title>Opacity on the root element blends with a white background</title>
<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
<link rel="help" href="https://drafts.fxtf.org/compositing/#pagebackdrop">
<link rel="match" href="root-element-opacity-ref.html">
<meta name="fuzzy" content="0-1;0-480000">
<html style="background: #BBB; opacity: 0.5">
  <div id=spacer style="width: 100px; height: 3000px"></div>
</html>