In which year HTML was first proposed?

Basically, in 1980, A great physicist Sir Tim Berners -Lee who is a contractor at CERN proposed the way through which documents can be shared easily. So, he prototyped ENQUIRE (a system for CERN), which would help researchers to use and share documents. HTML Tags was basically the first publicly description of HTML which was first mentioned by Tim Berners Lee in late 1991. He is usually the professor of computer programming. He is the author of HTML which is treated to be as the foremost computer languages of all the times. His idea of writing this language brought a tycoon in the computer technology world and also nowadays it is also much popular and most trending.