Template:CSS-based template/doc

Usage
This is a meta-template intended to mark templates that depend heavily on external CSS rules for correct formatting. The purpose is to clarify how to change the formatting, and to help people who want to use the template on other wikis.

(Specifically, it is intended for things like the  class used in Template:Audio, the   class used in Template:Video, and the   class used in Template:Quote.  It should probably not be added to every template that uses a trivial CSS rule.)