Test of several deprecated mstyle attributes
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstyle fontsize="150%" fontweight="bold" fontstyle="italic" fontfamily="helvetica" color="teal">
    <mn>2</mn>
    <mo>+</mo>
    <mi>x</mi>
  </mstyle>
</math>
Author: Design Science, Inc. (D. Doyle)