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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-on-popup.html 

<!DOCTYPE html>
<html>
<body>
<script>
window.onload = function() {
  try {
    top.location = "iframe-that-send-message-to-the-opener.html";
  } catch(e) {
    top.postMessage("cannot navigate", "*");
  }
}
</script>
</body>
</html>