Package Emulation
Most supported KaTeX functions emulate AMS-LaTeX behavior. That is, they emulate LaTeX running with the amsmath package, the amsfonts package, and the amssymb package installed (via \usepackage{amsmath,amsfonts,amssymb}).
There are several exceptions, however. Below is a list of additional functions from other LaTeX packages that are emulated by KaTeX.
\hdashline
: column separator in array environment
\bm
\cancel \bcancel \xcancel
\color \textcolor \colorbox \fcolorbox
\xlongequal \xtwoheadleftarrow \xtwoheadrightarrow \xtofrom
\href
\KaTeX
\widecheck
\gt \lt (useful to avoid HTML reserved characters < and >)
\mathclap \mathllap \mathrlap \xleftrightarrow \xRightarrow \xLeftarrow \xLeftrightarrow \xhookleftarrow \xhookrightarrow \xmapsto \xrightharpoondown \xrightharpoonup \xleftharpoondown \xleftharpoonup \xrightleftharpoons \xleftrightharpoons \coloneqq \Coloneqq \coloneq \Coloneq \eqqcolon \Eqqcolon \eqcolon \Eqcolon \colonapprox \Colonapprox \colonsim \Colonsim \dblcolon
\overgroup \undergroup \overlinesegment \underlinesegment \overleftharpoon \overrightharpoon
\Overrightarrow
\notni
\argmin \argmax`
\lBrace \rBrace
\llbracket \rrbracket
\sout
\utilde
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