testing/web-platform/tests/https-upgrades/resources/pass-with-referrer.html


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<!DOCTYPE html>
<html>
  <body>
    <script>
      window.onload = (event) => {
          window.opener.postMessage({
              'pass': true,
              'referrer': document.referrer},
            '*');
      };
    </script>
  </body>
</html>