ElementaryMathExamples-msline06

test for : msline mslinethickness="medium"

W3C sample	WIRIS
	$424+33$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstack>
    <mn>424</mn>
    <msrow>
      <mo>+</mo>
      <none/>
      <mn>33</mn>
    </msrow>
    <msline mslinethickness="medium"/>
  </mstack>
</math>

Author: Yecheng Gu