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

<!DOCTYPE html>
<!--
@SCRIPT:
  frac1.AXMathFractionNumerator.AXChildren.count
  frac1.AXMathFractionNumerator.AXChildren[0].AXValue
  frac2.AXMathFractionNumerator
-->
<math>
  <mfrac id="frac1">
    <mn>1</mn>
    <mn>2</mn>
  </mfrac>
  <mfrac id="frac2">
  </mfrac>
</math>