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<script>
let keepAlive;
window.onpageshow = (pageShow) => {
let bc = new BroadcastChannel("bfcache_blocking");
bc.onmessage = async function(m) {
switch(m.data.message) {
case "load":
bc.close();
location.href = m.data.url;
break;
case "runScript":
let test = new Function(`return ${m.data.fun};`)();
keepAlive = await test.call(window);
bc.postMessage({ type: "runScriptDone" });
break;
case "back":
bc.close();
history.back();
break;
case "forward":
bc.close();
history.forward();
break;
case "close":
window.close();
break;
}
};
bc.postMessage({ type: pageShow.type, persisted: pageShow.persisted })
};
</script>