MathML generated by MathToWeb
A MathML example displaying the Latex command \overbrace{...}.

$\overbrace{a + ar + ar^2 + \dotsb = \frac{a}{1-r}}^{ \text{converges if and only if $|r| < 1$} }$

${\displaystyle \stackrel{\text{converges if and only if |r| < 1}}{\overbrace{a+ar+a{r}^2+\cdots =\genfrac{}{}{0.1ex}{}{a}{1-r}}}}$

<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
	<mstyle displaystyle="true">
		<mover>
			<mrow>
				<mover accent="true">
					<mrow>
						<mi>a</mi>
						<mo>+</mo>
						<mi>a</mi>
						<mi>r</mi>
						<mo>+</mo>
						<mi>a</mi>
						<msup>
							<mi>r</mi>
							<mn>2</mn>
						</msup>
						<mo>+</mo>
						<mo>&ctdot;</mo>
						<mo>=</mo>
						<mfrac linethickness="1">
							<mi>a</mi>
							<mrow>
								<mn>1</mn>
								<mo>-</mo>
								<mi>r</mi>
							</mrow>
						</mfrac>
					</mrow>
					<mo stretchy="true">&OverBrace;</mo>
				</mover>
			</mrow>
			<mrow>
				<mtext>converges&nbsp;if&nbsp;and&nbsp;only&nbsp;if&nbsp;|r|&nbsp;&lt;&nbsp;1</mtext>
			</mrow>
		</mover>
	</mstyle>
</mrow>
</math>