mpaddedAwidth6

W3C sample	WIRIS
	$A A A A A A A A A A A$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>A</mi>
    <mpadded width="1.5height">
      <mi>A</mi>
    </mpadded>
    <mi>A</mi>
    <mpadded width="3width">
      <mi>A</mi>
    </mpadded>
    <mi>A</mi>
    <mpadded width="150%width">
      <mi>A</mi>
    </mpadded>
    <mi>A</mi>
    <mpadded width="2em">
      <mi>A</mi>
    </mpadded>
    <mi>A</mi>
    <mpadded width="12pt">
      <mi>A</mi>
    </mpadded>
    <mi>A</mi>
  </mrow>
</math>

Author: Robert Miner and Jeff Schaefer, Geometry Technologies