<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Redirect destination for non-HTML documents to close themselves</title>
<script>
'use strict';
const channel = new URL(location).searchParams.get('channel');
const bc = new BroadcastChannel(channel);
bc.onmessage = () => close();
bc.postMessage({name: 'FAIL', closed: 'FAIL' });
</script>