Khan/KaTeX — pull request #94 by kevinb7 (2014-09-20 23:56:49+00:00)
Title: Added support for \cssId

The syntax is \cssId{id}{math}. The second parameter can be either a group or a single atom. It handles spacing correctly when using a group, e.g. ```\cssId{id}{1+2}+3``` will render properly.