I've been doing some quick skim-reading, and thought I'd relay some data-points:
1. Will MathJax work without JS? I can't answer authoratatively, but it seems unlikely given that the big headline text on www.mathjax.org is "MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers".
Wondering about other ways to implement maths support, some other means of editing MathML might be useful in the future, but it appears that browser support for MathML is not sufficiently widespread yet. See https://en.wikipedia.org/wiki/MathML#Web_browsers. So it looks as though MathJax is still about the only widely-accessible cross-browser way of doing this, but it probably requires JS.
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1. Will MathJax work without JS? I can't answer authoratatively, but it seems unlikely given that the big headline text on www.mathjax.org is "MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers".
2. This page on accessibility is worth a skim. http://www.mathjax.org/resources/articles-and-presentations/accessible-pages-with-mathjax/
3. As is this one on browser compatibility: http://www.mathjax.org/resources/browser-compatibility/
Wondering about other ways to implement maths support, some other means of editing MathML might be useful in the future, but it appears that browser support for MathML is not sufficiently widespread yet. See https://en.wikipedia.org/wiki/MathML#Web_browsers.
So it looks as though MathJax is still about the only widely-accessible cross-browser way of doing this, but it probably requires JS.