===== $\KaTeX{}$ =====

==== Math Envionment ====

$$
\begin{CD}
   A @>a>> B \\
@VbVV @AAcA \\
   C @= D
\end{CD}
$$

==== Style, Color, Size and Font ====

  * $\color{blue} F=ma$
  * $\fcolorbox{red}{aqua}{$F=ma$}$

==== Math Equation with Macro Definition ====

$$
\f\relax{x} = \int_{-\infty}^\infty
    \f\hat\xi\,e^{2 \pi i \xi x}
    \,d\xi
$$

===== mhchem for $\KaTeX{}$ =====

==== Chemical Equations (CE) ====

  * $\ce{CO2 + C -> 2 CO}$
  * $\ce{Hg^2+ ->[I-] HgI2 ->[I-] [Hg^{II}I4]^2-}$
  * $C_p[\ce{H2O(l)}] = \pu{75.3 J // mol K}$
  * $\ce{x Na(NH4)HPO4 ->[\Delta] (NaPO3)_x + x NH3 ^ + x H2O}$
  * $\ce{SO4^2- + Ba^2+ -> BaSO4 v}$


==== Chemical Formulae ====

  * $\ce{H2O}$
  * $\ce{Sb2O3}$

====Chemical Units (PU) ====

  * $\pu{123 kJ}$
  * $\pu{123 kJ*mol-1}$
  * $\ce{Zn_{(s)} + Cu^{2+}_{(aq)} ->[{H_2O}] Zn^{2+}_{(aq)} + Cu_{(s)}}$
  * $\ce{Zn^2+  <=>[+ 2OH-][+ 2H+]  $\underset{\text{amphoteres Hydroxid}}{\ce{Zn(OH)2 v}}$  <=>[+ 2OH-][+ 2H+]  $\underset{\text{Hydroxozikat}}{\ce{[Zn(OH)4]^2-}}$}$

• The delimiters $$ and $ follows the configuration of ''option-delimiters''.
• The TeX/LaTeX expressions KaTeX supported could be found here.
• More example for writing chemical equations with mhchem could be found here.
• If you're not familiar with typing equations with TeX/LaTeX. The LaTeX Equation Editor, Detexify will be helpful.