Support for xparse?

[GregVernon]

We recently switched from using "pure" LaTeX to MathJax -- so that we can render our theory manuals / reports on our webpage and also render to PDF (for publication / report submission etc). One issue that we're running into is that we made heavy use of xparse and MathJax doesn't support xparse. I was wondering if KaTeX supports xparse? From this discussion it sounds like "no" - but I didn't see it explicitly stated and am not expert enough to read between the lines whether it is or isn't supported.

If it's not supported, is there any advantage to using KaTeX vs MathJax specifically regarding "workarounds" for lack of xparse support?

[edemaine]

I can confirm that KaTeX doesn't support xparse. I'm not familiar with xparse, but I imagine we could add it in, if you're interested in working on KaTeX.

In general I feel like KaTeX has a pretty flexible and powerful macro system (with some things still missing though), but I'm also not very familiar with MathJax's so I'm not sure how they compare.

If you have a specific example of a macro you'd like to implement, I'd be happy to think about how to best express it in KaTeX.