passed

merror-01

You should see error message below

W3C sample	WIRIS
	$A / 0$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <merror>
    <mrow>
      <mi>A</mi>
      <mo>/</mo>
      <mn>0</mn>
    </mrow>
  </merror>
</math>

Author: George Chavchanidze, Opera Software ASA