testing/web-platform/tests/portals/resources/portal-post-message-before-activate-window.html


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<!DOCTYPE html>
<body>
  <script>
    var portal = document.createElement("portal");
    portal.src = "portal-post-message-before-activate-portal.html";
    document.body.appendChild(portal);

    portal.onload = () => {
      portal.postMessage("message");
      portal.activate();
    }
  </script>
</body>