docshell/test/navigation/file_sessionstorage_across_coop.html


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<!DOCTYPE html>
<html>
  <body>
    <script>
      addEventListener("load", () => {
        let bc = new BroadcastChannel("testChannel");
        bc.postMessage(sessionStorage.getItem("testItem"));
        window.close();
      });
    </script>
  </body>
</html>