Unknown node type "mstack"

[lled0]

Hi,

I'm trying to parse a mml formula, but show error: Unknown node type "mstack".

I read in documentation that MathML3 is implemented in version 3 and there isn't needed to import the extension.

Here is an example.

<math xmlns="http://www.w3.org/1998/Math/MathML"> <mstyle mathsize="12px"> <mstack charalign="center" stackalign="right"> <msrow><mn>32</mn><mo>&#186;</mo><mn>58</mn><mo>'</mo><mn>49</mn><mo>"</mo></msrow> <msrow><mo>&#215;</mo><mn>4</mn></msrow><msline></msline><msrow></msrow> </mstack> </mstyle> </math>

What's wrong?

Thank you!

[dpvc]

Please see my response to mathjax/MathJax#2780.