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chromium/chrome/test/data/android/url_overriding/navigation_from_user_gesture_parent_frame.html 

<!DOCTYPE html>
<meta name="viewport"
    content="width=device-width, initial-scale=1.0, maximum-scale=1.0"/>
<body style='height:10000px'>
<p>Hello World</p>
<iframe src="navigation_from_user_gesture.html" width="100%" height="99%"></iframe>
</body>