<!DOCTYPE html>
<html>
  <head>
    <title>Test mpadded</title>
  </head>
  <body>
    <math>
      <mpadded mathbackground="blue" width="100px" height="50px" depth="50px"
               lspace="20px" voffset="-20px">
        <mpadded mathbackground="red" width="20px" height="10px"
                 depth="10px">
        </mpadded>
      </mpadded>
    </math>
  </body>
</html>