How does one go about rendering units properly in MathJaX?
For example,
$$ 100 N.m,\ \ 3 \times 10^8 m.s^{-1} $$
It's conventional to typeset units in upright (non-italic) font, as in:
$$ 100 \textrm{ N.m},\ \ 3 \times 10^8 \textrm{m}.\textrm{s}^{-1} $$
In LaTeX, you might import units siunits or siunitx for this, but those packages don't exit in MathJax.
You can kind-of do it using \textrm{} but this doesn't play nice with superscripts. For example 9.81 \textrm{m.s^{-2}} comes out as
$$ 9.81 \textrm{m.s^{-2}} $$
which is not quite as desired.
\$\mathrm{m.s^{-2}}\$\$\endgroup\$