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After the Internet had been established in the 1980'ies, Tim Berners-Lee developed the idea and the first implementation of the WWW in 1989 at the European research institution CERN in Geneva, Switzerland. The WWW (or, simply, "the web") is based on the Internet technologies TCP/IP and DNS. Initially, it consisted of
the Hypertext Markup Language (HTML), and
web server programs, acting as HTTP servers, as well as web 'user agents' (such as browsers), acting as HTTP clients.
Later, further technology components have been added to this set of basic web technologies:
the page/document style language Cascading Style Sheets (CSS) in 1995,
the Extensible Markup Language (XML), as the basis of XHTML and the web formats SVG and MathML, in 1998.