For information on stylesheets, see the CSS2 specification . Style sheets separate content and structure from presentation. They prevent the misuse of structural markup to achieve pure presentational effects. They also minimize the author's work, since a single style sheet can be used for multiple documents, and a change to the stylesheet is automatically available to all documents. If an author's style sheet poses a problem for the user, it can be turned off or a user defined style sheet can be used to override it.
Style sheets offer greater flexibility for both authors and users.