ORld-Wide Web> (CSS) An extension to HTML to allow styles, e.g. colour, font, size to be specified fOR certain elements of a hypertext document. Style infORmation can be included in-line in the HTML file OR in a separate CSS file (which can then be easily shared by multiple HTML files). Multiple levels of CSS can be used to allow selective overriding of styles. Start . (2000-07-26)