Is CSS used anywhere besides web browsers?

Question

Just curious - apart from its ubiquitous use in specifying the presentation of HTML in modern web browsers, do any programs or standards utilize CSS?

Answer 1

Mozilla uses CSS to style the user interface of its products (Firefox, Thunderbird, Sunbird, etc.). It also uses CSS to bind logic to markup (-moz-binding).

Flex is also using custom CSS properties to style the interface.

Furthermore, the Qt GUI framework (written in C++) is using CSS.