Broken LaTeX for mathcal

[ijabbott]

There is an Chrome extension called Native MathML that forces MathJax/KaTeX/MediaWiki to use native MathML rendering. For best results, the Fonts for MathML should also be installed.

Personally, I think MathJax still looks better with the Native MathML extension disabled so that one of MathJax's other Math Renderer settings can be used. (It's best to experiment to see which settings work best for you.) You should probably install the fonts mentioned above anyway, because MathJax will use them if installed.