File: file_online_offline_bfcache.html

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<html>
  <head>
    <script>
      onpageshow = function(pageshowEvent) {
        let bc = new BroadcastChannel("online_offline_bfcache");
        bc.onmessage = function(event) {
          if (event.data == "nextpage") {
            bc.close();
            location.href = location.href + "?nextpage";
          } else if (event.data == "back") {
            bc.close();
            history.back();
          } else if (event.data == "forward") {
            bc.close();
            history.forward();
          }  else if (event.data == "close") {
            bc.postMessage("closed");
            bc.close();
            window.close();
          }
        };
        bc.postMessage({ event: pageshowEvent.type, persisted: pageshowEvent.persisted });
      }

      onoffline = function(event) {
        let bc = new BroadcastChannel("online_offline_bfcache");
        bc.postMessage(event.type);
        bc.close();
      }

      ononline = function(event) {
        let bc = new BroadcastChannel("online_offline_bfcache");
        bc.postMessage(event.type);
        bc.close();
      }

    </script>
  </head>
  <body>
  </body>
</html>