Want to add on that TeX support is pretty much the only thing holding me back from this. I feel like KaTeX is not only easy to integrate but also full featured.

Want to add on that TeX support is pretty much the only thing holding me back from this. I feel like KaTeX is not only easy to integrate but also full featured. I'd be incredibly impressed if you could render full LaTeX though - e.g. via a renderer switch and a PDF viewer like PDF.js.