mfrac-12

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

W3C sample	WIRIS
	$$\begin{gathered} \frac{1}{2}=\frac{\phantom{1} \\ 1}{2 \\ \phantom{1}} \end{gathered}$$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mfrac>
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <mo>=</mo>
  <mfrac>
    <mrow>
      <mphantom>
        <mn>1</mn>
      </mphantom>
      <mspace linebreak="newline"/>
      <mn>1</mn>
    </mrow>
    <mrow>
      <mn>2</mn>
      <mspace linebreak="newline"/>
      <mphantom>
        <mn>1</mn>
      </mphantom>
    </mrow>
  </mfrac>
</math>

Author: George Chavchanidze, Opera Software ASA