mrow: a row of formula, mi: identifier, mo: operator, mn: number literal $x+y=2$

mtext: text, mspace: space $\text{if }x=y\text{那么}ax=ay$

mpadded: add extra space $\text{if}x=y\text{then}ax=ay$

ms: a quoted string. $''Hello\; word!''$

mfrac: fractions $\frac{x-1}{100}$

msqrt: square root, mroot: radical $\sqrt{x+y}+\sqrt[3]{x}$

msub: subscript, msup: superscript $x_i+x^j+x_i^j$

munder: underscript, mover: overscript $\underset{─}{x}\text{,}\overrightarrow{v}\text{,}\sum _{n=0}^{\infty }\text{,}\underset{a}{\overset{b}{\int }}$

mtable, mtr, mtd: used to draw matrices and grouped formulae $\left[\begin{array}{ccc}\frac{1}{2}& 0& 0\\ 0& 1& 0\\ 0& 0& 1\end{array}\right]$ $\left[\begin{array}{ccc}\frac{1}{2}& 0& 0\\ 0& 1& 0\\ 0& 0& 1\end{array}\right]$ $\{\begin{array}{c}2x+y=8\\ x+y=6\end{array}$

maligngroup: align formulae, currently not supported by firefox $\{\begin{array}{c}2x+y=8\\ x+y=6\end{array}$

mlabeledtr: labeled table row, currently not supported by firefox $\begin{array}{}\text{Gauss' law}& \nabla \cdot \mathrm{E}=\frac{\rho }{{\epsilon }_0}\text{Gauss's law for magnetism}& \nabla \cdot \mathrm{B}=0\end{array}$

mfenced: tuple like (x, y, z). (deprecated) $\left(x,y,z\right)$

menclose: draw box around formula. (non-standard) $\boxed{n!}$ $\cancel{1+1=3}$

mphantom: invisible text $\frac{1}{x^{\phantom{y^z}}}+\frac{1}{x^{y^z}}$

mstyle