mover-08.test

<<< native
[ EOver
    False (EIdentifier "_ baseline _") (EIdentifier "over script")
, ESymbol Rel "="
, EOver
    False
    (EUnder
       False (EIdentifier "_ baseline _") (EPhantom (EIdentifier "fail")))
    (EIdentifier "over script")
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mover>
      <mi>_ baseline _</mi>
      <mi>over script</mi>
    </mover>
    <mo>=</mo>
    <mover>
      <munder>
        <mi>_ baseline _</mi>
        <mphantom>
          <mi>fail</mi>
        </mphantom>
      </munder>
      <mi>over script</mi>
    </mover>
  </mrow>
</math>