testing/web-platform/tests/portals/resources/postmessage-referrer.sub.html


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<!DOCTYPE html>
<script>
  let message = {
    httpReferrer: '{{header_or_default(Referer, no-http-referrer)}}',
    documentReferrer: document.referrer || 'no-document-referrer',
  };
  window.portalHost.postMessage(message);
</script>