<html>
<head>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
</head>

<body>
<math>
    <mfenced separators=" ">
        <mrow>
            <mrow>
                <mi>v</mi>
            </mrow>
            <mi>i</mi>
        </mrow>
    </mfenced>
</math>
</body>
</html>