File: file_blockBFCache.html

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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>