With KaTeX's 'output' option (https://katex.org/docs/next/options.html https://katex.org/docs/next/options.html) you can have both. For providing accessibility

With KaTeX's 'output' option (https://katex.org/docs/next/options.html https://katex.org/docs/next/options.html) you can have both. For providing accessibility for screen readers, TeX formula copying etc. you have to choose one of the MathML options of course. For pure rendering, the html is good enough (even with Chrome). I don't know about MathJax, though.