MathML generated by MathToWeb
A MathML example displaying the AMS-Latex pairing delimiters ( and )  (i.e. round brackets or parentheses).
The commands \left and \right instruct Latex and MathToWeb to automatically size the brackets to properly encompass whatever expression they enclose.

$\left(\genfrac{}{}{0.1ex}{}{a}{b}\right)$ $\left( \frac{a}{b} \right)$

<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
	<mo>(</mo>
	<mfrac linethickness="1">
		<mi>a</mi>
		<mi>b</mi>
	</mfrac>
	<mo>)</mo>
</mrow>
</math>