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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigate-event/cross-window/resources/cross-origin-iframe-helper.html 

<!DOCTYPE html>
<script>
navigation.onnavigate = e => {
  const message = {
    navigationType: e.navigationType,
    cancelable: e.cancelable,
    canIntercept: e.canIntercept,
    userInitiated: e.userInitiated,
    hashChange: e.hashChange,
    formData: e.formData,
    destination: {
      url: e.destination.url,
      sameDocument: e.destination.sameDocument,
      key: e.destination.key,
      id: e.destination.id,
      index: e.destination.index
    }
  };
  e.preventDefault();
  top.postMessage(message, "*");
};

window.onload = () => {
  if (location.href.includes("postMessage-top-when-done")) {
    top.postMessage("DONE", "*");
  }
};
</script>