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<html>
<head>
<script>
onpageshow = function(pageShowEvent) {
var bc = new BroadcastChannel("beforeunload_and_bfcache");
bc.onmessage = function(event) {
if (event.data == "nextpage") {
bc.close();
location.href += "?nextpage";
} else if (event.data == "back") {
bc.close();
history.back();
} else if (event.data == "forward") {
onbeforeunload = function() {
bc.postMessage("beforeunload");
bc.close();
}
history.forward();
} else if (event.data == "close") {
bc.postMessage("closed");
bc.close();
window.close();
}
};
bc.postMessage({type: pageShowEvent.type, persisted: pageShowEvent.persisted});
};
</script>
</head>
<body>
</body>
</html>