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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-color-body-propagation-ref.html 

<!DOCTYPE html>
<html style="background:green">
<title>CSS Reftest Reference</title>
<link rel="author" title="Rune Lillesveen" href="mailto:[email protected]">
<body style="margin:0">
<p>The viewport should have a green background.</p>