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

<!DOCTYPE html>
<!--
@AURALINUX-ALLOW:tag:*
-->
<math>
  <mpadded class="test"
           voffset="10px" lspace="5px" width="30px" height="20px" depth="10px">
    <mn>1</mn>
    <mn>2</mn>
    <mn>3</mn>
    <mn>4</mn>
  </mpadded>
</math>