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Test Info:

<!DOCTYPE HTML>↩
<html>↩
<body>↩
<iframe src="data:text/xml,↩
<html xmlns='http://www.w3.org/1999/xhtml'↩
onDOMAttrModified='window.frameElement.parentNode.removeChild(window.frameElement)'>↩
</html>"↩
onload="event.target.contentDocument.documentElement.setAttribute('x', 'y');"></iframe>↩
</body>↩
</html>↩