text: <!DOCTYPE html>
  <html>
    <head>
      <title>mfrac bevelled</title>
    </head>
    <body>
      <math>
        <mfrac style="font-size: 300%">
          <mspace width="20px" height="20px" mathbackground="red"></mspace>
          <mspace width="20px" height="20px" mathbackground="red"></mspace>
        </mfrac>
      </math>
    </body>
  </html>
  