<!DOCTYPE HTML>
<html>
<body>
<!-- Default values for open, close, separators -->
<math>
<mfenced open="(" close=")" separators=",">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
<mi>d</mi>
<mi>e</mi>
</mfenced>
</math>
</body>
</html>