Collapse the tree of StyleSheetFrags into a single Cls, side-effect all the output into the styleSheetText, and return the Cls
Collapse the tree of StyleSheetFrags into a single Cls, side-effect all the output into the styleSheetText, and return the Cls
(Since version ) see corresponding Javadoc for more information.
Used to define a new, uniquely-named class with a set of styles associated with it.