windowFeature-values-target.html

Enable keyboard shortcuts

<script>

  const channelName = location.search.substr(1),

        channel = new BroadcastChannel(channelName);

  const haveOpener = window.opener !== null;

  const haveReferrer = document.referrer !== null && document.referrer !== "";

  const allBarProps = [

    window.locationbar.visible,

    window.menubar.visible,

    window.personalbar.visible,

    window.scrollbars.visible,

    window.statusbar.visible,

    window.toolbar.visible

];

  const isPopup = allBarProps.every(x=>!x);

  channel.postMessage({haveOpener, haveReferrer, isPopup});

  // 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>