msubsup-11.test

<<< mml
<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">  <msubsup>    <mi>T</mi>     <mi>m</mi>     <mi>n</mi>   </msubsup>   <mo>=</mo>   <mover>    <mrow>      <msubsup>        <mi>T</mi>         <mi>m</mi>         <mi>n</mi>       </msubsup>     </mrow>     <mphantom>      <mtext>x</mtext>
    </mphantom>   </mover> </math>
>>> native
[ ESubsup (EIdentifier "T") (EIdentifier "m") (EIdentifier "n")
, ESymbol Rel "="
, EOver
    False
    (ESubsup (EIdentifier "T") (EIdentifier "m") (EIdentifier "n"))
    (EPhantom (EText TextNormal "x"))
]