<!doctype html>
<html>
<head>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();
    </script>
</head>
<body>
  <p>This test PASSES if it does not CRASH or ASSERT.</p>
<math> 
    <munderover>
        <mn style="display: list-item;">mn</mn>
    </munderover>
</math>