math-ml VS MathJax

I implemented MathML as web components a few years ago as a work around. It wasn't super hard, but a native implementation provides so much better accessibility (and, likely, perf) https://github.com/pshihn/math-ml

Unfortunately there is no common in-browser Math rendering and as the referenced article points out, pictures of equations are not the solution [2]. A common mathematics rendering format is desperately needed but nobody really seems motivated to solve it.

My approach is to use MathML that is rendered natively by Firefox and use JS to render in other browsers [3]. MathJax is way too heavy the last time I checked (growing towards 1MB) [4]. Instead I use math-ml, a JS library that is somewhat complete/abandoned but mostly works in about 80kB [5].

My rational for supporting Firefox's approach is that it's the browser I use, MathML is supported by W3C [6], MathML is supported by pandoc and there is a lightweight workaround for other browsers.

[1] https://pandoc.org/

[2] https://danilafe.com/blog/math_rendering_is_wrong/

[3] https://coffeespace.org.uk/projects/mathml-render.html

[4] https://www.mathjax.org/

[5] https://github.com/pshihn/math-ml

[6] http://www.w3.org/1998/Math/MathML

MathJax - Mathematical Notations expressed using Tex or MathML

Developer tools point to MathJax https://www.mathjax.org/. If you disable javascript you can see some LaTex.

It is something we could add, but it is not planned in the near future. We also have requests for adding math notation (like https://www.mathjax.org/), and that could be a more general solution.

I don't know what Obsidian is, but if it's requiring old TeX math mode toggles (the double dollar sign), then it might not actually be using LaTeX underneath. Many tools that provide LaTeX-style syntax for equations are actually using something like MathJaX, BlahTex, or some custom system by which to translate LaTeX-like syntax into their own equation rendering. This often means you only get a pre-defined subset of what's possible with LaTeX (and the results are never quite faithful to how LaTeX would typeset them).

This will depend heavily on where you're asking the question, e.g. stackexchange has built in mathjax to render it. I'm going to assume you're intending to ask here (because that would make sense), in which case check out the bottom of the sidebar.

From the screenshot, Obsidian looks like a typical Markdown editor that supports some LaTeX math syntax, probably rendered with something like Mathjax. On the other hand, Xournalapp seems to actually use LaTeX, even allowing you to use LaTeX packages like graphicx, tikz, etc.