## tex4ht - Bugs: bug #278, Wrong mathml with $\langle$

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## bug #278: Wrong mathml with $\langle$

 Submitted by: Michal Hoftich Submitted on: Thu Mar 31 11:34:24 2016 Category: None Priority: 5 - Normal Severity: 5 - Normal Status: None Privacy: Public Assigned to: None Open/Closed: Closed

Thu Aug 27 11:17:20 2020, comment #2:

The code from mathml- option for MathClass configurations is now used by default for the MathML output. The previous default code just produced invalid markup in too many cases. See: https://github.com/michal-h21/make4ht/issues/34

There is small difference in the MathML rendering from the default TeX output, as brackets are scaled automatically to match the enclosed content. I hope that it is not really issue.

Michal Hoftich <michal_h21>
Wed Jul 1 11:02:51 2020, comment #1:

The mathml- option doesn't insert extra <mrow> elements, so it produces valid MathML code. Semantically, <mrow> should be used to enclose the operator and the fenced code. The MathML code in this case is inserted using ht-fonts mechanism in tex4ht DVI processor. It would be best if it was possible to insert some code in the DVI post-processing in the case when there is unclosed delimiter.

This is the relevant code from tex4ht-mathml.tex:

Michal Hoftich <michal_h21>
Thu Mar 31 11:34:24 2016, original submission:

This sample document:

-------------
\documentclass{article}

\begin{document}

hello $\langle$
\end{document}
----------

generates wrong mathml:

--------------
<math
xmlns="http://www.w3.org/1998/Math/MathML"
display="inline" ><mrow ><mo
class="MathClass-open">&#x2329;</mo><mrow>[/itex]
--------------

note the second <mrow> tag, there should be closing tag instead. tex4ht expects that there is some more math content following and it is then closed using \rangle, which correctly insert closing </mrow>.

Michal Hoftich <michal_h21>

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