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chromium/third_party/blink/web_tests/fast/frames/resources/iframe-scroll-page-up-down-1.html 

<html>
<body>
top
<br>
<div style="height:100px"></div>
<iframe width="400px" height="100px" src="./iframe-scroll-page-up-down-2.html"></iframe>
<div style="height:100px"></div>
bottom
</body>
</html>