Provides interfaces for DOM Level 2 Style Specification. Refer to the
Document Object Model (DOM) Level 2 Style Specification,
the CSS and stylesheets modules define the Document Object Model Level 2 Style
Sheets and Cascading Style Sheets (CSS) that allow programs and scripts to
dynamically access and update the content of style sheets documents.
The MediaList interface provides the abstraction of an
ordered collection of media, without defining or constraining how this
collection is implemented.