testing/web-platform/tests/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/body-bgcolor-attribute-change.html


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<!doctype html>
<link rel="help" href="https://html.spec.whatwg.org/multipage/obsolete.html#attr-body-bgcolor">
<link rel="match" href="body-bgcolor-attribute-change-ref.html">
<body bgcolor="yellow">
  Passes if the background is green.
</body>
<script>
  document.body.offsetTop;
  document.body.setAttribute("bgcolor", "green");
</script>