page-that-post-message-to-opener.html « resources « navigating-across-documents « browsing-the-web « browsers « html « tests « web-platform « testing - firefox-esr - debian 12 security: mozilla

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Page that postMessage to its opener</title>
<script>
  opener.postMessage('Allowed', '*');
</script>