Client-side is not really feasible (emscripten TeX has been done, but the packages to load are just too huge...). Server-side, https://tex.s2cms.com/ https://t

Client-side is not really feasible (emscripten TeX has been done, but the packages to load are just too huge...). Server-side, https://tex.s2cms.com/ https://tex.s2cms.com/ does a nice job and outputs svg; https://upmath.me/ https://upmath.me/ by same author is markdown editor integrating it - see tikz examples there.