texmath-0.7: tests/writers/stretchHoriz3.mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
<mi>H</mi>
<mover>
<mo accent="true">→</mo>
<mtext mathvariant="normal">This is a long stretched arrow</mtext>
</mover>
<mi>H</mi>
</mrow>
</math>