page_with_frame_transformed_into_viewport.html

<!DOCTYPE html>
<style>
div {
	transform-origin: top left;
	transform: scale(0.5);
}
iframe {
	height: 200vh;
	width: 100vw;
}
</style>

<html>
<body>
<div>
<iframe src="about:blank"></iframe>
</div>
</body>
</html>

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