As a very much work-in-progress, yesterday, I started working on interactive equations https://p.migdal.pl/equations-explained-colorfully/ (it uses KaTeX under the hood).

The idea is similar to https://betterexplained.com/articles/colorized-math-equation..., but with mouseover interaction (both for further description, but also for accessibility). For a deeper dive in the topic of explorable explanations, I wrote https://p.migdal.pl/blog/2024/05/science-games-explorable-ex... (was here on the HN as well).