page_with_large_positioned_frame.html

<!DOCTYPE html>
<style>
iframe {
  position:absolute;
  top: 50px;
  left: 50px;
  width: 80vw;
  height: 80vh;
}
</style>
<html>
<body>
<iframe src="/cross-site/baz.com/title1.html"></iframe>
This page contains a positioned cross-origin iframe.
</body>
</html>

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