msup-10

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

W3C sample	WIRIS
	$$S^2=\underset{\phantom{\mathrm{fail}}}{S^2}$$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <msup>
    <mi>S</mi>
    <mn>2</mn>
  </msup>
  <mo>=</mo>
  <munder>
    <mrow>
      <msup>
        <mi>S</mi>
        <mn>2</mn>
      </msup>
    </mrow>
    <mphantom>
      <mi>fail</mi>
    </mphantom>
  </munder>
</math>

Author: George Chavchanidze, Opera Software ASA