passed

mfencedAdelims6

W3C sample WIRIS
a + b a b d e a b a b 
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mfenced open="[">
    <mrow>
      <mi>a</mi>
      <mo>+</mo>
      <mi>b</mi>
    </mrow>
  </mfenced>
  <mfenced open="{" close="}" separators="|;+">
    <mfrac>
      <mi>a</mi>
      <mi>b</mi>
    </mfrac>
    <mfrac>
      <mi>d</mi>
      <mi>e</mi>
    </mfrac>
    <mi>a</mi>
    <mi>b</mi>
    <mi>a</mi>
    <mi>b</mi>
  </mfenced>
</math>

Author: Robert Miner and Jeff Schaefer, Geometry Technologies