Thank you very much for your reply! admin.
In MS 2013 is normal, but MS 2007 not working. You can test on MS 2003 or 2007? Thank you very much!
$mathML = '
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
<mn mathvariant="bold-italic">x</mn>
<mn>y</mn>
</mrow>
</math>';
$docx->addMathEquation($mathML, 'mathml');
In the above code to run results, x display is abnormal, y display is normal in ms word 2007.