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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/assign-replace-from-top-to-nested-iframe.html 

<!DOCTYPE HTML>
<html>
  <head>
    <title>Referer with location.replace and location.assign with nested iframes</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <iframe src="resources/iframe-with-iframe.html" hidden></iframe>
    <script>
      const iframe = document.querySelector("iframe");
      async_test(function(t) {
        function on_message(e) {
          const referrer = e.data;
          assert_equals(referrer, iframe.contentWindow.location.href);
          t.done();
        }
        window.addEventListener('message', t.step_func(on_message), false);
        window.addEventListener('load', function () {
            iframe.contentDocument.querySelector("iframe").contentWindow.location.replace("/resources/blank.html");
        }, false);
      }, "Browser sends Referer header in nested iframe request when location.replace is called on an iframe");
      async_test(function(t) {
        function on_message(e) {
          const referrer = e.data;
          assert_equals(referrer, iframe.contentWindow.location.href);
          t.done();
        }
        window.addEventListener('message', t.step_func(on_message), false);
        window.addEventListener('load', function () {
            iframe.contentDocument.querySelector("iframe").contentWindow.location.replace("/resources/blank.html");
        }, false);
      }, "Browser sends Referer header in nested iframe request when location.assign is called on an iframe");
    </script>
  </body>
</html>