KaTeX is an open source text markup language created in 2013 by Emily Eisenberg.
#120on PLDB  11Years Old 
git clone https://github.com/Khan/KaTeX
The fastest math typesetting library for the web.
% \f is defined as #1f(#2) using the macro
\f\relax{x} = \int_{\infty}^\infty
\f\hat\xi\,e^{2 \pi i \xi x}
\,d\xi
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