It works in many POSIX-style systems (tested on Linux and MacOS X), and in Windows with Cygwin.
[table> [tr>[td>1<>2<>3<]<] [tr>[td>a<>b<>c<]<] <]which produces:
<table> <tr><td>1</td><td>2</td><td>3</td></tr> <tr><td>a</td><td>b</td><td>c</td></tr> <table>
These screenshots show Emacs 21 being used with "qmath-mode.el". (See the file README.EMACS in the source package for how to install it)