mfenced-08

Single and double bar fences should have the same height

W3C sample	WIRIS
	$$\left|\begin{array}{c}U\\ V\end{array}\right|=‖\begin{array}{c}U\\ V\end{array}‖$$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mfenced open="|" close="|">
    <mrow>
      <mtable>
        <mtr>
          <mtd>
            <mi>U</mi>
          </mtd>
        </mtr>
        <mtr>
          <mtd>
            <mi>V</mi>
          </mtd>
        </mtr>
      </mtable>
    </mrow>
  </mfenced>
  <mo>=</mo>
  <mfenced open="‖" close="‖">
    <mrow>
      <mtable>
        <mtr>
          <mtd>
            <mi>U</mi>
          </mtd>
        </mtr>
        <mtr>
          <mtd>
            <mi>V</mi>
          </mtd>
        </mtr>
      </mtable>
    </mrow>
  </mfenced>
</math>

Author: George Chavchanidze, Opera Software ASA