KaTeX is an open source text markup language created in 2013 by Emily Eisenberg.
git clone https://github.com/Khan/KaTeX
#379on PLDB  10Years Old 
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
Feature  Supported  Token  Example 

Comments  âœ“  % A comment 

Line Comments  âœ“  %  % A comment 
Semantic Indentation  X 