Hi,
it seems the
https://mathapedia.com/ has a sister project now which supports purely browser side LaTeX and PSTricks rendering:
They have some impressive examples of interactive PSTricks graphics here. All done with JS and it seems to extend MathJax:
After discovering this today I was very excited and tried to render a PSTricks graphics from Siyavula's Physics book. Unfortunately it seems it does not support PSTricks entirely (e.g. it does not like indication of size with "pt")
Here an example how it looks like:
Marvin