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<!DOCTYPE html>
<script>
const windowProps = ["innerWidth", "innerHeight"];
const windowPropsObj = {};
const channelName = location.search.substr(1);
const channel = new BroadcastChannel(channelName);
for (const prop of windowProps) {
windowPropsObj[prop] = window[prop];
}
channel.postMessage(windowPropsObj);
// 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>