mtable-09.test

<<< native
[ EArray
    [ AlignCenter , AlignCenter , AlignCenter ]
    [ [ [ EGrouped
            [ EPhantom (EText TextNormal "fail")
            , EUnder
                False (EIdentifier "HT") (EPhantom (EText TextNormal "fail"))
            ]
        ]
      , [ ESymbol Rel "=" ]
      , [ EGrouped
            [ EOver
                False (EIdentifier "TH") (EPhantom (EText TextNormal "fail"))
            , EPhantom (EText TextNormal "fail")
            ]
        ]
      ]
    ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mtable>
    <mtr>
      <mtd columnalign="center" style="text-align: center">
        <mrow>
          <mphantom>
            <mtext mathvariant="normal">fail</mtext>
          </mphantom>
          <munder>
            <mi>HT</mi>
            <mphantom>
              <mtext mathvariant="normal">fail</mtext>
            </mphantom>
          </munder>
        </mrow>
      </mtd>
      <mtd columnalign="center" style="text-align: center">
        <mo>=</mo>
      </mtd>
      <mtd columnalign="center" style="text-align: center">
        <mrow>
          <mover>
            <mi>TH</mi>
            <mphantom>
              <mtext mathvariant="normal">fail</mtext>
            </mphantom>
          </mover>
          <mphantom>
            <mtext mathvariant="normal">fail</mtext>
          </mphantom>
        </mrow>
      </mtd>
    </mtr>
  </mtable>
</math>