Receives data on the BroadcastChannel and prints them below.
Open <a href=send.html>send.html</a> in another tab
to send some messages.

<script>
  var bc = new BroadcastChannel("bfcacheTest");
  bc.onmessage = (event) => {
    console.log(event);
    bcMessages.textContent += "\n" + event.data
  };
  window.addEventListener('pageshow', (event) => {
    bf.textContent = event.persisted ? "persisted" : "not persisted";
  });

</script>
<div><b>BFCache status:</b> <span id=bf><span></div>
<div><b>messages received:</b></div>
<pre id=bcMessages style="border: 1px solid">

</pre>