Highlighting test

example.tex

\documentclass{article}
\usepackage[koi8-r]{inputenc}
\hoffset=0pt
\voffset=.3em
\tolerance=400
\newcommand{\eTiX}{\TeX}
\begin{document}
\section*{Highlight.js}
\begin{table}[c|c]
$\frac 12\, + \, \frac 1{x^3}\text{Hello \! world}$ & \textbf{Goodbye\~ world} \\\eTiX $ \pi=400 $
\end{table}
Ch\'erie, \c{c}a ne me pla\^\i t pas! % comment \b
G\"otterd\"ammerung~45\%=34.
$$
    \int\limits_{0}^{\pi}\frac{4}{x-7}=3
$$
\end{document}