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chromium/third_party/blink/web_tests/external/wpt/css/compositing/root-element-blend-mode-ref.html 

<!doctype HTML>
<title>Blend-mode on the root stacking context blends with the root element's background.</title>
<html style="background: #000">
  <div style="width: 50px; height: 50px; background: #000"></div>
  <div id=spacer style="width: 100px; height: 3000px"></div>
</html>