DocumentStyle interface provides a mechanism by which the
style sheets embedded in a document can be retrieved.
LinkStyle interface provides a mechanism by which a style
sheet can be retrieved from the node responsible for linking it into a
MediaList interface provides the abstraction of an
ordered collection of media, without defining or constraining how this
collection is implemented.
StyleSheet interface is the abstract base interface for
any type of style sheet.
StyleSheetList interface provides the abstraction of an
ordered collection of style sheets.