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chromium/third_party/blink/web_tests/fast/overflow/scrollRevealButton.html 

<html>This test should scroll recursively to reveal the button.
<body onload="document.getElementById('fr').contentDocument.getElementById('bt').focus();">
<div style="height:500px"></div>
<iframe src="resources/scrollButton1.html" id="fr" name="fr"></iframe>
<div style="height:500px"></div>
</body>
</html>