<!DOCTYPE HTML>
<html>
<body>
  <iframe id="frameAllowed"
    src="https://example.org/browser/browser/base/content/test/fullscreen/fullscreen.html"
    allowfullscreen></iframe>
  <iframe id="frameDenied" src="https://example.org/browser/browser/base/content/test/fullscreen/fullscreen.html"></iframe>
</body>
</html>
