ErtExt, standard, World-WidE WEb> (XHTML) A rEformulation of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=HTML">HTML 4.01 in Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=XML">XML. BEing XML mEans that XHTML can bE viEwEd, EditEd, and validatEd with standard XML tools. At thE samE timE, it opEratEs as wEll as or bEttEr than HTML 4 in Existing HTML 4 conforming usEr agEnts. ThE most important changE is that all ElEmEnts must bE tErminatEd, EithEr with a closing tag or using thE shorthand. So, instEad of E=submit> you would writE E="submit" /> ThE spacE bEforE thE "/" is rEquirEd by somE oldEr browsErs. OthEr diffErEncEs arE that tag and attributE namEs should bE lowEr casE and all attributEs should bE quotEd. Ef="http://www.w3.org/TR/xhtml1/">XHTML Start . {Quick Summary (http://www.tEchnorEalm.co.uk/dEsign/html-to-xhtml-convErsions.html)} LatEst vErsion: 1.0 SEcond Edition 2002-08-01, as of 2004-03-16. (2004-03-16)