chromium/content/test/data/frame_tree/page_with_cross_origin_frame_at_half.html

<!DOCTYPE html>
<style>
div {
  position: absolute;
  top: 60%;
  width: 100px;
  height: 200px;
  overflow: scroll;
}
iframe {
  width: 100px;
  height: 10000px;
  border: 0;
}
</style>
<html>
<body>
<div>
<iframe src="/cross-site/baz.com/title1.html"></iframe>
</div>
This page contains a positioned cross-origin iframe.
</body>
</html>