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chromium/third_party/blink/web_tests/fast/harness/override-zzz-reset.html 

<html>
<body>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<body>
    <p>This test verifies that the testRunner will reset its default preferences after every layout test.  You should see "PASS" below.</p>
    <span id="status">FAIL</span>
    <script>
        document.getElementById("status").innerHTML = "PASS";
    </script>
</body>
</html>