first-meta-changed-after-second-added.http.html

<!DOCTYPE html>
<head>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>

  <meta name="referrer" content="no-referrer" id="referrermeta">
</head>
<body>
  <script>
    async function fetchAndGetReferrer() {
      let response = await fetch('/common/security-features/subresource/xhr.py');
      let data = await response.json();
      return data.headers.referer;
    }

    promise_test(async t => {
      assert_equals(await fetchAndGetReferrer(), undefined,
                    'referrer should not be set');

      // Add second meta _before_ first meta.
      const first_meta = document.getElementById('referrermeta');
      const second_meta = document.createElement('meta');
      second_meta.name = 'referrer';
      second_meta.content = 'strict-origin';
      document.head.appendChild(second_meta);
      assert_equals(await fetchAndGetReferrer(), window.location.origin + '/',
                    'referrer should be origin only');

      // Update content attribute of first meta.
      first_meta.content = 'unsafe-url';
      assert_equals(await fetchAndGetReferrer(), window.location.href,
                    'referrer should be full url');
      }, 'document referrer policy is the value of the most recently modified <meta name="referrer"');

  </script>
</body>

chromium/third_party/blink/web_tests/external/wpt/referrer-policy/generic/first-meta-changed-after-second-added.http.html