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chromium/content/test/data/accessibility/mac/attributes/ax-math-superscript.html 

<!DOCTYPE html>
<!--
@SCRIPT:
  sup1.AXMathSuperscript.AXChildren.count
  sup1.AXMathSuperscript.AXChildren[0].AXValue
  sup2.AXMathSuperscript
  subsup1.AXMathSuperscript.AXChildren.count
  subsup1.AXMathSuperscript.AXChildren[0].AXValue
  subsup2.AXMathSuperscript
-->
<math>
  <msup id="sup1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <msup id="sup2">
    <mn>1</mn>
  </msup>
  <msubsup id="subsup1">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
  </mfrac>
  <msubsup id="subsup2">
    <mn>1</mn>
    <mn>2</mn>
  </msubsup>
</math>