iframe-postmessage-to-parent-parent.sub.html

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<!DOCTYPE HTML>

<html>

  <head>

    <title>Resource file for test of Referer with location.replace</title>

  </head>

  <body>

    <div></div>

    <script>

      const referer = "{{header_or_default(referer, missing)}}"

      window.parent.parent.postMessage(referer);

      document.querySelector("div").textContent = `Referer header: ${referer}`;

    </script>

  </body>

</html>