File: cross-origin-middle-frame.html

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<!DOCTYPE html>
<!-- This document is used for the test `move-node-local-root.html` -->
<script src="/common/get-host-info.sub.js"></script>

<body>
<script>
(async function() {
  // This iframe will be cross-origin to the current document, but same-origin
  // with its grandparent, our direct parent.
  const iframe = document.createElement('iframe');
  iframe.src = new URL('resources/blank.html', get_host_info().HTTP_ORIGIN);
  const loadPromise = new Promise(resolve => iframe.onload = resolve);
  document.body.append(iframe);
  await loadPromise;

  parent.postMessage('grandchild loaded', '*');
})();
</script>
</body>