window-open-popup-target.html | Explore in Territory

<!DOCTYPE html>
<script>
  var channelName = window.name;
  var channel = new BroadcastChannel(channelName);
  const allBarProps = [
    window.locationbar.visible,
    window.menubar.visible,
    window.personalbar.visible,
    window.scrollbars.visible,
    window.statusbar.visible,
    window.toolbar.visible
  ];
  const allTrue = allBarProps.every(x=>x);
  const allFalse = allBarProps.every(x=>!x);
  channel.postMessage({isPopup: allFalse, mixedState: !allTrue && !allFalse});

  // 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 = function() {
    window.close();
  };
</script>

chromium/third_party/blink/web_tests/external/wpt/html/browsers/the-window-object/support/window-open-popup-target.html