close_noopener_beforeunload-1.html | Explore in Territory

<!doctype html>
<script>
let chan = new BroadcastChannel("close_noopener_beforeunload" + location.search);
onload = function() { window.close(); };
onbeforeunload = function() {
  chan.postMessage({ name: "beforeunload", history: history.length });
}
</script>

chromium/third_party/blink/web_tests/external/wpt/html/browsers/the-window-object/open-close/close_noopener_beforeunload-1.html