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chromium/third_party/blink/web_tests/media/webkit-media-controls-webkit-appearance.html 

<!DOCTYPE html>
<p>Overloading ::-webkit-media-controls -webkit-appearance. PASS if it doesn't crash.</p>
<style>
::-webkit-media-controls {
    -webkit-appearance: button;
}
</style>
<video controls></video>