testing/web-platform/tests/portals/resources/portals-nested-portal.html


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<!DOCTYPE html>
<body>
  <script>
    var portal = document.createElement("portal");
    portal.src = "simple-portal.html";
    portal.onload = e => window.portalHost.postMessage(e.data);
    document.body.appendChild(portal);
  </script>
</body>