4059 		"+": function(checkSet, part){  argument
4060 			var isPartStr = typeof part === "string",
4061 				isTag = isPartStr && !rNonWord.test( part ),
4065 				part = part.toLowerCase();
4072 					checkSet[i] = isPartStrNotTag || elem && elem.nodeName.toLowerCase() === part ?
4074 						elem === part;
4079 				Sizzle.filter( part, checkSet, true );
4083 		">": function( checkSet, part ) {  argument
4085 				isPartStr = typeof part === "string",
4089 			if ( isPartStr && !rNonWord.test( part ) ) {
4090 				part = part.toLowerCase();
4097 						checkSet[i] = parent.nodeName.toLowerCase() === part ? parent : false;
4108 							elem.parentNode === part;
4113 					Sizzle.filter( part, checkSet, true );
4118 		"": function(checkSet, part, isXML){  argument
4123 			if ( typeof part === "string" && !rNonWord.test( part ) ) {
4124 				part = part.toLowerCase();
4125 				nodeCheck = part;
4129 			checkFn( "parentNode", part, doneName, checkSet, nodeCheck, isXML );
4132 		"~": function( checkSet, part, isXML ) {  argument
4137 			if ( typeof part === "string" && !rNonWord.test( part ) ) {
4138 				part = part.toLowerCase();
4139 				nodeCheck = part;
4143 			checkFn( "previousSibling", part, doneName, checkSet, nodeCheck, isXML );