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<!DOCTYPE html>
<html>
  <head>
    <title>mfrac denomalign</title>
  </head>
  <body>
    <div style="position: absolute;">
      <math xmlns="http://www.w3.org/1998/Math/MathML">
        <mfrac denomalign="left" linethickness="0">
          <mspace width="100px" height="20px" mathbackground="red"></mspace>
          <mspace width="50px" height="20px" mathbackground="red"></mspace>
        </mfrac>
      </math>
    </div>
  </body>
</html>