I've always wondered the opposite: why don't major browsers implement (La)TeX formulas, given they are a de facto standard? I mean something like MathJax, but a

I've always wondered the opposite: why don't major browsers implement (La)TeX formulas, given they are a de facto standard? I mean something like MathJax, but available with JavaScript disabled. Don't trigger it with $, but maybe with something more odd, like $@ ... @$, or similar.