I started my first website in 1996 when GeoCities came out and began learning HTML in 1998 and CSS in 1999. I began working professionally in front end web development “in the year 2000” (thanks, Conan). I have done many things with CSS beginning in 2000 that very few people knew about and/or knew that there was browser support for (did you know Netscape could handle changing style sheets in 2000 and possibly earlier? Did you know they supported advanced CSS selectors in 2002 and possibly earlier?).