munder-12

Formatting of right hand side of equation should be identical to formatting of left hand side

W3C sample	WIRIS
	$$\underset{\mathrm{underscript}}{\mathrm{B}}=\underset{\mathrm{underscript}}{\phantom{1}\mathrm{B}\phantom{1}}$$

<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>

Author: George Chavchanidze, Opera Software ASA