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

<!DOCTYPE html>
<html>
<head>
<script>
  function addFrame(url, sandbox) {
    var frame = document.createElement('iframe');
    frame.src = url;
    if (sandbox)
      frame.sandbox = sandbox;
    document.body.appendChild(frame);
  }
</script>
</head>
<body>
  This page has one cross-site iframe.
  <iframe id="child0" name="child-name-0" src="/cross-site/baz.com/title1.html"></iframe>
</body>
</html>