A CSSX (Extended Cascading Style Sheets) file including non-CSS (Cascading Style Sheet) extensions is used to define and reference variables and inheritance sets. A CSSX file compiler determines a value of the defined variable, modifies the CSSX file by replacing all references to the defined variable...http://www.google.com/patents/US7941746?utm_source=gb-gplus-sharePatent US7941746 - Extended cascading style sheets
