mozilla-central/testing/web-platform/tests/html/browsers/windows/post-message/resources/first-party-to-third-party-cross-partition-cross-origin-iframe.https.html

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<!doctype html>
<meta charset=utf-8>
<body>
<script>
// Step 3 (html/browsers/windows/post-message/first-party-to-third-party-cross-partition-cross-origin.sub.html)
window.top.opener.postMessage("Site 3 Frame", "*");
</script>
</body>