testing/web-platform/tests/portals/resources/portal-host-post-message-after-activate.html


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<!DOCTYPE html>
<script>
  window.portalHost.postMessage("loaded");

  var ph = window.portalHost;

  window.onportalactivate = e => {
    var exception_name = ""
    try {
      ph.postMessage("message");
    }
    catch (error) {
      exception_name = error.name;
    }
    bc = new BroadcastChannel("portal-host-post-message-after-activate");
    bc.postMessage(exception_name, "*");
    bc.close();
  };
</script>