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

<!DOCTYPE html>
<!--
@SCRIPT:
  sub1.AXMathBase.AXChildren.count
  sub1.AXMathBase.AXChildren[0].AXValue
  sub2.AXMathBase
  sup1.AXMathBase.AXChildren.count
  sup1.AXMathBase.AXChildren[0].AXValue
  sup2.AXMathBase
  subsup1.AXMathBase.AXChildren.count
  subsup1.AXMathBase.AXChildren[0].AXValue
  subsup2.AXMathBase
  under1.AXMathBase.AXChildren.count
  under1.AXMathBase.AXChildren[0].AXValue
  under2.AXMathBase
  over1.AXMathBase.AXChildren.count
  over1.AXMathBase.AXChildren[0].AXValue
  over2.AXMathBase
  underover1.AXMathBase.AXChildren.count
  underover1.AXMathBase.AXChildren[0].AXValue
  underover2.AXMathBase
  multiscripts1.AXMathBase.AXChildren.count
  multiscripts1.AXMathBase.AXChildren[0].AXValue
  multiscripts2.AXMathBase
-->
<math>
  <msub id="sub1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <msub id="sub2">
  </msub>
  <msup id="sup1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <msup id="sup2">
  </msup>
  <msubsup id="subsup1">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
  </mfrac>
  <msubsup id="subsup2">
  </msubsup>
  <munder id="under1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <munder id="under2">
  </munder>
  <mover id="over1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <mover id="over2">
  </mover>
  <munderover id="underover1">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
  </mfrac>
  <munderover id="underover2">
  </munderover>
  <mmultiscripts id="multiscripts1">
    <mtext>base</mtext>
  </mmultiscripts>
  <mmultiscripts id="multiscripts2">
  </mmultiscripts>
</math>