scriptlevel

<!-- math-depth defaults to 0 on the <math> root. -->
<math style="font-size: 64pt">
  <msubsup>
    <!-- math-depth and font-size remain unchanged on the base. -->
    <mtext>BASE</mtext>
    <!-- math-depth defaults to add(1) within the subscript, so it
         is incremented by 1 and the font-size is scaled down once. -->
    <mtext>SUBSCRIPT</mtext>
    <!-- math-depth defaults to add(1) within the superscript too, but
         the scriptlevel attribute tells to increment it by 2 instead,
         so the font-size is actually scaled down twice. -->
    <mtext scriptlevel="+2">SUPERSCRIPT</mtext>
  </msubsup>
</math>

<math scriptlevel="-1"> <!-- decrease math-depth by 1 -->
<math scriptlevel="+2"> <!-- increase math-depth by 2 -->
<math scriptlevel="0"> <!-- reset math-depth to 0 -->