Limitations

  • TeX4ht doesn’t understand features for which it is not configured
      \newcommand\myfrac[2]{\vbox{$#1$ \par\vrule\par $#2$}}  
    \begin{document}  
    ...  
    \myfrac{#1}{#2}  
    ...

  • Users may configure features in configuration files
    \Preamble{}  
      \def\myfrac{\frac}  
    \begin{document}  
    \EndPreamble

  • A few features are not understood correctly by TeX4ht
    $a {}_1^2b$               % wrong for MathML

    They require users’ interface.

    $a {\csname HCode\endcsname{}}_1^2b$

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