TeX Packages supported?

Question

It is possible to do useful things with external $\TeX$ packages; but what packages are supported (and which do not need an explicit \require{…})? I could only find only three packages with explicit \require{…} documented by example in the MathJax tutorial; two are used below.

Example: to get this   $\require{AMScd} \require{cancel} \begin{CD} A @> x >> B\\ @V y V V \xcancel\LaTeX @V V u V\\ C @>> v > D \end{CD}$   we can use this:

$\require{AMScd} \require{cancel}
\begin{CD}
     A @>           x    >>      B\\
@V y V V    \xcancel\LaTeX    @V V u V\\
     C @>>          v     >      D
\end{CD}$

Answer 1

There is a list of extensions here. Some are included already. They are

action

$$\require{action}\mathtip{\text{hover over this}}{e^x}$$

amsMath/amsSymbols (already included)

\begin{align} &\text{align} \\ &\text{equations!} \end{align}

amsCD

$$\begin{CD} A @> x >> B\\ @V y V V @V V u V\\ C @>> v > D \end{CD}$$

autobold

bolds math automatically $\require{autobold} x + y$

BBox (doesn't need a \require?)

$$\bbox[red]{x+y}$$

begingroup

see The scope of \newcommand is the entire page

cancel

$$\require{cancel} \cancel{x + y}$$

color

MathJax has a \color built-in. See the MathJax docs or this thread for more information on what the color package does.

enclose

$$\require{enclose} \enclose{circle}{~~~x+y+z~~~}$$

extpfeil

$$\require{extpfeil} \Newextarrow{\xrightharpoonup}{5,10}{0x21C0} X \xrightharpoonup{f} Y$$

html

This one's blocked.

mhchem

$$\require{mhchem} \ce{C6H5-CHO} \ce{$A$ ->[\ce{+H2O}] $B$} \ce{SO4^2- + Ba^2+ -> BaSO4 v}$$

noErrors (already included?)

Not sure what this does

noUndefined (already included)

$$\badcommand$$

unicode (doesn't need a \require)

$$\unicode[.55,0.05]{x22D6}$$

autoload-all

loads everything

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Right click on the math and select "Show Math As->TeX Commands" to see what commands were used.