Plain Old Semantic HTML (POSH) Welcome to the POSH home page. Origins The acronym POSH was coined on 6 April 2007 on the microformats IRC channel, by <kwijibo> as a shorthand abbreviation for "plain old semantic HTML". A discussion on among John Allsopp, Tantek Çelik, Jeremy Keith, and Chris Messina at the Microformats Dinner 2007 April 18 following Web 2.0 Expo reraised the idea of POSH and the i