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

<!DOCTYPE html>
<!--
@SCRIPT:
  multiscripts1.AXMathPrescripts.count
  multiscripts1.AXMathPrescripts[0].AXMathSuperscript.AXChildren[0].AXValue
  multiscripts1.AXMathPrescripts[1].AXMathSubscript.AXChildren[0].AXValue
  multiscripts1.AXMathPrescripts[1].AXMathSuperscript.AXChildren[0].AXValue
  multiscripts1.AXMathPrescripts[2].AXMathSubscript.AXChildren[0].AXValue
  multiscripts1.AXMathPrescripts[2].AXMathSuperscript.AXChildren[0].AXValue

@SCRIPT:
  multiscripts2.AXMathPrescripts.count
  multiscripts2.AXMathPrescripts[0].AXMathSubscript.AXChildren[0].AXValue
  multiscripts2.AXMathPrescripts[0].AXMathSuperscript.AXChildren.count
  multiscripts2.AXMathPrescripts[1].AXMathSubscript.AXChildren.count
  multiscripts2.AXMathPrescripts[1].AXMathSuperscript.AXChildren[0].AXValue

@SCRIPT:
  multiscripts3.AXMathPrescripts

@SCRIPT:
  multiscripts4.AXMathPrescripts.count
  multiscripts4.AXMathPrescripts[0].AXMathSuperscript.AXChildren[0].AXValue
  multiscripts4.AXMathPrescripts[0].AXMathSubscript.AXChildren[0].AXValue
-->
<math>
  <mmultiscripts id="multiscripts1">
    <mtext>base</mtext>
    <mtext>post1</mtext>
    <mtext>post2</mtext>
    <mtext>post3</mtext>
    <mtext>post4</mtext>
    <mtext>post5</mtext>
    <mtext>post6</mtext>
    <mprescripts/>
    <mtext>pre1</mtext>
    <mtext>pre2</mtext>
    <mtext>pre3</mtext>
    <mtext>pre4</mtext>
    <mtext>pre5</mtext>
    <mtext>pre6</mtext>
  </mmultiscripts>
  <mmultiscripts id="multiscripts2">
    <mtext>base</mtext>
    <mtext>post1</mtext>
    <none/>
    <none/>
    <mtext>post4</mtext>
    <mprescripts/>
    <mtext>pre1</mtext>
    <none/>
    <none/>
    <mtext>pre4</mtext>
  </mmultiscripts>
  <mmultiscripts id="multiscripts3">
    <mtext>base</mtext>
    <mn>1</mn>
    <mn>2</mn>
  </mmultiscripts>
  <mmultiscripts id="multiscripts4">
    <mtext>base</mtext>
    <mprescripts/>
    <mn>1</mn>
    <mn>2</mn>
  </mmultiscripts>
</math>