File: BarProp-target.html

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<!DOCTYPE html>
<script>
  const barProps = ["locationbar", "menubar", "personalbar", "scrollbars", "statusbar", "toolbar"];
  const barPropsObj = {};
  const channelName = location.search.substr(1);
  const channel = new BroadcastChannel(channelName);
  for (const prop of barProps) {
    barPropsObj[prop] = window[prop].visible;
  }
  channel.postMessage(barPropsObj);

  // Because messages are not delivered synchronously and because closing a
  // browsing context prompts the eventual clearing of all task sources, this
  // document should not be closed until the opener document has confirmed
  // receipt.
  channel.onmessage = () => { window.close() };
</script>