ElementaryMathExamples-mstack07

test for : mstack charspacing="tight"

W3C sample	WIRIS
	$137+268$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstack charspacing="tight">
    <mn>137</mn>
    <msrow>
      <mo>+</mo>
      <mn>268</mn>
    </msrow>
    <msline/>
  </mstack>
</math>

Author: Yecheng Gu