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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/history-traversal/window-name-after-cross-origin-main-frame-navigation.sub.html 

<!DOCTYPE HTML>
<html>
<head>
    <script src='/resources/testharness.js'></script>
    <script src='/resources/testharnessreport.js'></script>
</head>
<body>
    <button id="button" onclick="popup();">open popup</button>
    <script>
    function popup() {
      window.popupWin = window.open('support/window-name-after-cross-origin-main-frame-navigation-popup.sub.html', '_blank');
    }
    async_test(t => {
      t.add_cleanup(() => {
        popupWin.close();
      })
      document.getElementById('button').click();
      onmessage = t.step_func(e => {
        assert_true(e.data);
      });
    }, 'window.name should equal "" after a cross-origin main frame navigation');
    </script>
</body>
</html>