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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/document-canvas-remove-body.html 

<!DOCTYPE html>
<html class="reftest-wait">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#body-background">
<link rel="match" href="document-canvas-remove-body-ref.html">
<body style="background: red"></body>
<script>
waitForAtLeastOneFrame().then(() => {
  document.body.remove();
  takeScreenshot();
});
</script>
</html>