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chromium/third_party/blink/web_tests/external/wpt/client-hints/accept-ch-stickiness/resources/accept-ch-blank.html 

<html>
<body>

<!-- Page with an empty accept-ch header, which disables client hints -->
<script>
  window.top.opener.postMessage('Loaded', '*');
</script>


</body>
</html>