<html xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://www.w3.org/1998/Math/MathML">
<body>

<!-- ... assuming that color inherits -->
<p>
  <span style="color: green"><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
  <span style="color: green"><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
  <span style="color: green"><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
</p>

<!-- ... assuming that color inherits -->
<p>
  <span><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
  <span style="color: green"><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
  <span style="color: green"><m:math><m:mstyle><m:mi>X</m:mi></m:mstyle></m:math></span>
</p>

<!-- ... assuming that mathbackground works on m:mstyle -->
<p><m:math><m:mstyle mathbackground="lightgreen"><m:mi>Y</m:mi></m:mstyle></m:math></p>
<p><m:math><m:mstyle mathbackground="lightgreen"><m:mi>Y</m:mi></m:mstyle></m:math></p>

<!-- ... assuming that mathbackground works on m:mstyle -->
<p><m:math><m:mstyle><m:mfenced><m:mi>x</m:mi></m:mfenced></m:mstyle></m:math></p>
<p><m:math><m:mstyle mathbackground="lightgreen"><m:mfenced><m:mi>x</m:mi></m:mfenced></m:mstyle></m:math></p>

</body>
</html>
