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

<!DOCTYPE html>
<!--
@SCRIPT:
  sub1.AXMathSubscript.AXChildren.count
  sub1.AXMathSubscript.AXChildren[0].AXValue
  sub2.AXMathSubscript
  subsup1.AXMathSubscript.AXChildren.count
  subsup1.AXMathSubscript.AXChildren[0].AXValue
  subsup2.AXMathSubscript
-->
<math>
  <msub id="sub1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <msub id="sub2">
    <mn>1</mn>
  </msub>
  <msubsup id="subsup1">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
  </mfrac>
  <msubsup id="subsup2">
    <mn>1</mn>
  </msubsup>
</math>