Is there support for matrices? Neither \begin{bmatrix} a & b \\ c & d \end{bmatrix} nor \begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} works.
Hey! We're planning on adding environments (everything that uses \begin and \end) sometime soon. There's a couple github issues touching on this point; if you want to know how development's going, you can follow one of the issues.
KaTeX: Math typesetting for the web
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