ThisspecificationdefinesCascadingStyleSheets,level2revision1(CSS2.1).CSS2.1isastylesheetlanguagethatallowsauthorsanduserstoattachstyle(e.g.,fontsandspacing)tostructureddocuments(e.g.,HTMLdocumentsandXMLapplications).Byseparatingthepresentationstyleofdocumentsfromthecontentofdocument