HTML ( Hypertext Markup Language ) has been in use since 1991 .
HTML 4.0 ( December 1997 ) was the first standardized version where international characters were given reasonably complete treatment .
HTML ( Hypertext Markup Language ) has been in use since 1991 , but HTML 4.0 ( December 1997 ) was the first standardized version where international characters were given reasonably complete treatment .