LayoutTests/http/tests/security/xss-DENIED-window-name-alert.html

<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<iframe sandbox="allow-scripts"
        src="data:text/html,<script>
            window.name='alert';
            alert(top.alert === window ? 'PASS' : 'FAIL');
            </script>"></iframe>