texmath-0.6.7: tests/src/munder-12.mml
<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <munder> <mi mathvariant="normal">B</mi> <mi mathvariant="normal">underscript</mi> </munder> <mo>=</mo> <munder> <mrow> <mphantom> <mn>1</mn>
</mphantom>
<mi mathvariant="normal">B</mi>
<mphantom>
<mn>1</mn>
</mphantom>
</mrow> <mi mathvariant="normal">underscript</mi> </munder> </math>