mrootE2

W3C sample	WIRIS
[N/A]	$\sqrt[x]{3} 3$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mroot>
      <mn>3</mn>
      <mi>x</mi>
      <mn>2</mn>
    </mroot>
    <mroot>
      <mn>3</mn>
    </mroot>
  </mrow>
</math>

Author: Robert Miner and Jeff Schaefer, Geometry Technologies