In 1989, While an independent contractor at CERN, Berners-Lee proposed a project known as World wide web. Project implied publishing of hypertext documents, connected by hyperlinks, that simplified search and consolidation of information. Web project was for scientists of CERN and used in an intranet of CERN. For implementation of the project Tim Berners-Lee (with his assistants) invented identifier URI (in particular, URL), HTTP protocol and HTML language. These technologies were in the base of modern World Wide Web. Since 1991 till 1993 Tim Berners-Lee improved technical specifications of standards and published them.

Within the framework of the project Berners-Lee wrote first web-server in the world httpd and first hypertext web-browser World Wide Web. This browser was at the same time WYSIWYG editor (What You See Is What You Get. Its development began in October of  1990 and finished in December of the same year. The program worked in NeXTStep environment and began to spread in Internet in summer of 1991.

Berners-Lee created first web-site in the world at http://info.cern.ch/. Now this site is stored in archive. This site appeared in Internet in summer of 1991. It contained a description of World Wide Web, how to install web, how to get browser, etc. This site also was the first internet-catalogue in the world, because later Berners-Lee placed and kept there a list of links to other sites.