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

<!DOCTYPE html>
<!--
@SCRIPT:
  over1.AXMathOver.AXChildren.count
  over1.AXMathOver.AXChildren[0].AXValue
  over2.AXMathOver
  underover1.AXMathOver.AXChildren.count
  underover1.AXMathOver.AXChildren[0].AXValue
  underover2.AXMathOver
-->
<math>
  <mover id="over1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <mover id="over2">
    <mn>1</mn>
  </mover>
  <munderover id="underover1">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
  </mfrac>
  <munderover id="underover2">
    <mn>1</mn>
    <mn>2</mn>
  </munderover>
</math>