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Test Info:

<!DOCTYPE html>↩
<html>↩
<body>↩
<div style="position:absolute; border: 20px solid black;↩
left: -50px; top: -50px; width: 3000px; height: 3000px;↩
border-radius: 160px; clip:rect(50px 60px 60px 50px);"> ↩
</div>↩
</body>↩
</html>↩