In [[computing]], ''''HTML element'''' (instance) in terms of [[SGML]] is the completeness of [[start tag]] with [[attribute]]s plus their [[attribute value|value]]s, content and [[end tag]], except for [[empty element]]s that don't have contents and end tags. Due to the constrainsconstraints of the [[Document Type Definition|DTD]]s, various parts, including start and end tag, may be omitted in [[HTML]], but not [[XHTML]].
It is often misnamed "[[HTML tag|tag]]", in a ugly kind of ''pars-pro-toto''.
