In '93 to '94, every browser had its own flavor of HTML. So it was very difficult to know what you could put in a Web page and reliably have most of your readership see it.

Sir Timothy John "Tim" Berners-Lee OM KBE FRS FREng FRSA (born 8 June 1955) also known as "TimBL" is a British computer scientist best known as the inventor of the World Wide Web. He made a proposal for an information management system in March 1989 and he implemented the first successful communication between a Hypertext Transfer Protocol (HTTP) client and server via the Internet sometime around mid November.