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<script>
  window.onpageshow = function(e) {
    if (location.search == "?v2") {
      onbeforeunload = function() {
        history.pushState("data1", "", "?push1");
      }
    }
    let bc = new BroadcastChannel("new_shentry_during_history_navigation");
    bc.onmessage = function(event) {
      bc.close();
      if (event.data == "loadnext") {
        location.href = "file_new_shentry_during_history_navigation_4.html";
      } else if (event.data == "back") {
        history.back();
      } else if (event.data == "close") {
        window.close();
      }
    }
    bc.postMessage({page: location.href, type: e.type, persisted: e.persisted});
  }
</script>