<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="mml.css" type="text/css"?>
<!DOCTYPE html SYSTEM "mathml.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:math="http://www.w3.org/1998/Math/MathML"
xmlns:xlink="http://www.w3.org/1999/xlink">
<head>
<title>MathML test</title>
<style type="text/css">
  background-color: white;
</style>
</head>
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <maction actiontype="toggle" selection="2">
    <mstyle color="black">
      <mrow>
        <msup>
          <mi>a</mi>
          <mn>2</mn>
        </msup>
        <mo>-</mo>
        <msup>
          <mi>b</mi>
          <mn>2</mn>
        </msup>
      </mrow>
    </mstyle>
    <mstyle color="black">
      <mrow>
        <mfenced>
          <mrow>
            <mi>a</mi>
            <mo>-</mo>
            <mi>b</mi>
          </mrow>
        </mfenced>
        <mo>⁢</mo>
        <mfenced>
          <mrow>
            <mi>a</mi>
            <mo>+</mo>
            <mi>b</mi>
          </mrow>
        </mfenced>
      </mrow>
    </mstyle>
  </maction>
</math></body>
</html>
