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<script>
const channelName = new URL(location).searchParams.get("channelname"),
channel = new BroadcastChannel(channelName);
channel.postMessage({ haveOpener: window.opener !== null,
referrer: document.referrer });
// 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>
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