MathJax is an open source JavaScript display engine , suitable for LaTeX, MathML and AsciMath notation in all modern browsers.
Mathjax uses web- based fonts to generate high-quality typography. This type of typography can reach full resolution. Math is text-based, not image-based, so it can be used in search engines
\( f(a) = \frac{1}{2\pi i} \oint\frac{f(z)}{z-a}dz \)
(1) Introduction of Mathjax