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<html>
<body>
<!-- An empty webpage whose response headers include Accept-CH
header. Fetching this webpage should cause
user-agent to persist origin preferences for the client hints
specified in the Accept-CH header until a Clear-Site-Data header
is sent or user action is take to clear the session or data about
the origin.-->
<script>
window.top.opener.postMessage('Loaded', '*');
</script>
</body>
</html>