This term is marked up as an abbreviation: EHS
This term is marked up as an acronym: EHS
This term simply uses a title attribute on a span: EHS
This term (EHS) is marked up as abbreviation that has its own style defined using CSS. Otherwise, as of March 2012 only Firefox 11 and Opera 11.61 (and unknown earlier versions) provide any visual indication of an abbreviation. IE9, Chrome 17, and Safari 5.1.2 do not.