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chromium/third_party/blink/web_tests/compositing/rounded-corners.html 

<!DOCTYPE html>
<html>
<body>
    <!-- Test for https://bugs.webkit.org/show_bug.cgi?id=106898 -->
    <div style="width: 200px; height: 200px; background: green; border-radius: 25%; will-change: transform;"></div>
</body>
</html>