page_with_perspective_transformed_frame.html

<!DOCTYPE html>
<style>
iframe {
  position:absolute;
  top: 50px;
  left: 50px;
  width: 100px;
  height: 100px;
  transform: perspective(50em) rotateY(45deg);
}

</style>
<html>
<body>
<iframe src="/cross-site/baz.com/title1.html"></iframe>
This page contains a cross-origin iframe with 45 degree perspective.
</body>
</html>

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