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<!DOCTYPE html>
<!--
There's two URL parameters supported here:
window: The property name of a getter on the global object that returns the relevant WindowProxy
object to message.
ident: A reasonably unique identifier that will be echoed as the message.
-->
<script>
const params = new URLSearchParams(location.search);
self[params.get("window")].postMessage(params.get("ident"), "*");
</script>