testing/web-platform/tests/webmessaging/multi-globals/support/incumbent-document-domain.sub.html


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<!DOCTYPE html>
<meta charset="utf-8">
<title>Incumbent page used as a test helper</title>

<h1>Incumbent</h1>

<script>
"use strict";
document.domain = "{{hosts[][]}}";

window.createBroadcastChannel = (...args) => {
  return new parent.frames[1].BroadcastChannel(...args);
};
</script>