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<html>
  <head>
    <script>
    window.onpageshow = function() {
      let bc = new BroadcastChannel("test_reload");
      bc.onmessage = function(event) {
        if (event.data == "reload") {
          bc.close();
          location.reload(true);
        } else if (event.data == "close") {
          bc.postMessage("closed");
          bc.close();
          window.close();
        }
      }
      bc.postMessage("pageshow");
    }
    </script>
  </head>
  <body>
  </body>
</html>