Although CERN design documents go back to the 1980s, the Web explosion began in 1993 with NCSA Mosaic. It was 1994 before important institutions and businesses began to discover the Web, testing the waters with brochure-style sites. In a quieter revolution, wholesale companies built Web-based mechanisms for supplying their upstream retail customers.
Newspapers put up complete daily editions.
Each new Web deployment costs money, and a lot of that money is spent on salaries of IT professional. Just as content preparation requires talent, content delivery requires IT talent. Others are converting old apps to new, Web-oriented implementations. My favorites are the ads that demand five years of experience as a Webmaster. Every programmer who is working on a Web project is by definition not doing something else in the IT field.