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chromium/content/test/data/accessibility/mathml/mmultiscripts.html 

<!DOCTYPE html>
<!--
@AURALINUX-ALLOW:tag:*
-->
<math>
  <mmultiscripts class="test">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
    <none/>
    <mn>5</mn>
    <mprescripts/>
    <mn>6</mn>
    <none/>
    <mn>8</mn>
    <mn>9</mn>
  </mmultiscripts>
</math>