[Dev-luatex] Re: Imprecise language in the OpenType Math specification leading to implementation differences amongst math engines

Hi David, On Tue, Mar 18, 2025 at 2:24 PM David Jones wrote:

Unfortunately v2.14 won't help because it was just a rebuild and has no new features. We are working on a major overhaul of the MATH table that will address the font-specific problems.

In the meantime, you might want to look at

https://sourceforge.net/p/xetex/bugs/175/

and

https://sourceforge.net/p/xetex/bugs/173/

and the comments in the implementation of get_ot_math_kern() in

https://github.com/TeX-Live/texlive-source/blob/trunk/texk/web2c/xetexdir/Xe...

Note especially comment (3) in the superscript branch.

Cheers, David.

Thank you, that was helpful to find an example (P_j). Best, Mikael