Both MathJax and KaTeX are javascripts. MathJax is math renderer on Wolfram Community and I see it working in Chrome now, for example:

$f(x) = \int_{-\infty}^\infty \hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi$

But if you have some back bone, like WL, which can render math, why indeed not to present it as an image? The only thing we loos is copy-able content, not sure if that is important for you.

CloudDeploy[TraditionalForm[
  Style[ToExpression["f(x) = \\int_{-\\infty}^\\infty \\hat f(\\xi)\\,e^{2 \\pi i \\xi x}\\,d\\xi", 
    TeXForm], 50]], "SVG"]