MathML generated by MathToWeb
A MathML example displaying \overrightarrow.

$\stackrel{⟶}{\mathrm{AB}}+\stackrel{⟶}{\mathrm{BC}}=\stackrel{⟶}{\mathrm{AC}}$ $\overrightarrow{AB} + \overrightarrow{BC} = \overrightarrow{AC}$

<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
	<mover accent="true">
		<mi>AB</mi>
		<mo stretchy="true">&xrarr;</mo>
	</mover>
	<mo>+</mo>
	<mover accent="true">
		<mi>BC</mi>
		<mo stretchy="true">&xrarr;</mo>
	</mover>
	<mo>=</mo>
	<mover accent="true">
		<mi>AC</mi>
		<mo stretchy="true">&xrarr;</mo>
	</mover>
</mrow>
</math>