testing/web-platform/tests/html/browsers/windows/post-message/resources/first-party-to-first-party-same-partition-window.html


1
2
3
4
5
6
7
8

<!doctype html>
<meta charset=utf-8>
<body>
<script>
// Step 2 (html/browsers/windows/post-message/first-party-to-first-party-same-partition.html)
window.opener.postMessage("Site 1 Window B", window.opener.origin);
</script>
</body>