chromium/chrome/test/data/frame_tree/anchor_targeting_remote_frame.html

<!doctype html>
<html>
<head>
<script>
function simulateClick(properties) {
  var evt = new MouseEvent("click", properties);

  target = document.getElementById("test-anchor");
  return target.dispatchEvent(evt);
}
</script>
</head>
<body>
This page helps testing shift-clicking or ctrl-clicking an anchor/link
that normally (when clicked without any modifier keys) targets a remote,
cross-site frame.  See also https://crbug.com/647772.
<hr>
<a href="/cross-site/c.com/title1.html"
   target="cross-site-frame"
   id="test-anchor">Test link to click while holding ctrl key</a>
<hr>
<iframe
  name="cross-site-frame"
  src="/cross-site/b.com/title1.html"></iframe>
</body>
</html>