Update built-in version of Sizzle to latest revision.

sstephenson · 2a6914089ad6f0b398d9f4ef7032e6bab818dd51 · Jul 3, 2011
commit 2a6914089ad6f0b398d9f4ef7032e6bab818dd51
1 parent f9d7c67
Unified Split

Showing with 680 additions and 282 deletions.

+680 −282  src/sizzle.js
@@ -1,29 +1,33 @@
 /*!
- * Sizzle CSS Selector Engine - v1.0
- *  Copyright 2009, The Dojo Foundation
+ * Sizzle CSS Selector Engine
+ *  Copyright 2011, The Dojo Foundation
  *  Released under the MIT, BSD, and GPL Licenses.
  *  More information: http://sizzlejs.com/
  */
 (function(){
 
-var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^[\]]*\]|['"][^'"]*['"]|[^[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
+var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^\[\]]*\]|['"][^'"]*['"]|[^\[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
 	done = 0,
 	toString = Object.prototype.toString,
 	hasDuplicate = false,
-	baseHasDuplicate = true;
+	baseHasDuplicate = true,
+	rBackslash = /\\/g,
+	rNonWord = /\W/;
 
 // Here we check if the JavaScript engine is using some sort of
 // optimization where it does not always call our comparision
 // function. If that is the case, discard the hasDuplicate value.
 //   Thus far that includes Google Chrome.
-[0, 0].sort(function(){
+[0, 0].sort(function() {
 	baseHasDuplicate = false;
 	return 0;
 });
 
-var Sizzle = function(selector, context, results, seed) {
+var Sizzle = function( selector, context, results, seed ) {
 	results = results || [];
-	var origContext = context = context || document;
+	context = context || document;
+
+	var origContext = context;
 
 	if ( context.nodeType !== 1 && context.nodeType !== 9 ) {
 		return [];
@@ -33,24 +37,34 @@ var Sizzle = function(selector, context, results, seed) {
 		return results;
 	}
 
-	var parts = [], m, set, checkSet, check, mode, extra, prune = true, contextXML = isXML(context),
+	var m, set, checkSet, extra, ret, cur, pop, i,
+		prune = true,
+		contextXML = Sizzle.isXML( context ),
+		parts = [],
 		soFar = selector;
 	
 	// Reset the position of the chunker regexp (start from head)
-	while ( (chunker.exec(""), m = chunker.exec(soFar)) !== null ) {
-		soFar = m[3];
+	do {
+		chunker.exec( "" );
+		m = chunker.exec( soFar );
+
+		if ( m ) {
+			soFar = m[3];
 		
-		parts.push( m[1] );
+			parts.push( m[1] );
 		
-		if ( m[2] ) {
-			extra = m[3];
-			break;
+			if ( m[2] ) {
+				extra = m[3];
+				break;
+			}
 		}
-	}
+	} while ( m );
 
 	if ( parts.length > 1 && origPOS.exec( selector ) ) {
+
 		if ( parts.length === 2 && Expr.relative[ parts[0] ] ) {
 			set = posProcess( parts[0] + parts[1], context );
+
 		} else {
 			set = Expr.relative[ parts[0] ] ?
 				[ context ] :
@@ -59,35 +73,45 @@ var Sizzle = function(selector, context, results, seed) {
 			while ( parts.length ) {
 				selector = parts.shift();
 
-				if ( Expr.relative[ selector ] )
+				if ( Expr.relative[ selector ] ) {
 					selector += parts.shift();
-
+				}
+				
 				set = posProcess( selector, set );
 			}
 		}
+
 	} else {
 		// Take a shortcut and set the context if the root selector is an ID
 		// (but not if it'll be faster if the inner selector is an ID)
 		if ( !seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
 				Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1]) ) {
-			var ret = Sizzle.find( parts.shift(), context, contextXML );
-			context = ret.expr ? Sizzle.filter( ret.expr, ret.set )[0] : ret.set[0];
+
+			ret = Sizzle.find( parts.shift(), context, contextXML );
+			context = ret.expr ?
+				Sizzle.filter( ret.expr, ret.set )[0] :
+				ret.set[0];
 		}
 
 		if ( context ) {
-			var ret = seed ?
+			ret = seed ?
 				{ expr: parts.pop(), set: makeArray(seed) } :
 				Sizzle.find( parts.pop(), parts.length === 1 && (parts[0] === "~" || parts[0] === "+") && context.parentNode ? context.parentNode : context, contextXML );
-			set = ret.expr ? Sizzle.filter( ret.expr, ret.set ) : ret.set;
+
+			set = ret.expr ?
+				Sizzle.filter( ret.expr, ret.set ) :
+				ret.set;
 
 			if ( parts.length > 0 ) {
-				checkSet = makeArray(set);
+				checkSet = makeArray( set );
+
 			} else {
 				prune = false;
 			}
 
 			while ( parts.length ) {
-				var cur = parts.pop(), pop = cur;
+				cur = parts.pop();
+				pop = cur;
 
 				if ( !Expr.relative[ cur ] ) {
 					cur = "";
@@ -101,6 +125,7 @@ var Sizzle = function(selector, context, results, seed) {
 
 				Expr.relative[ cur ]( checkSet, pop, contextXML );
 			}
+
 		} else {
 			checkSet = parts = [];
 		}
@@ -111,25 +136,28 @@ var Sizzle = function(selector, context, results, seed) {
 	}
 
 	if ( !checkSet ) {
-		throw "Syntax error, unrecognized expression: " + (cur || selector);
+		Sizzle.error( cur || selector );
 	}
 
 	if ( toString.call(checkSet) === "[object Array]" ) {
 		if ( !prune ) {
 			results.push.apply( results, checkSet );
+
 		} else if ( context && context.nodeType === 1 ) {
-			for ( var i = 0; checkSet[i] != null; i++ ) {
-				if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i])) ) {
+			for ( i = 0; checkSet[i] != null; i++ ) {
+				if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && Sizzle.contains(context, checkSet[i])) ) {
 					results.push( set[i] );
 				}
 			}
+
 		} else {
-			for ( var i = 0; checkSet[i] != null; i++ ) {
+			for ( i = 0; checkSet[i] != null; i++ ) {
 				if ( checkSet[i] && checkSet[i].nodeType === 1 ) {
 					results.push( set[i] );
 				}
 			}
 		}
+
 	} else {
 		makeArray( checkSet, results );
 	}
@@ -142,15 +170,15 @@ var Sizzle = function(selector, context, results, seed) {
 	return results;
 };
 
-Sizzle.uniqueSort = function(results){
+Sizzle.uniqueSort = function( results ) {
 	if ( sortOrder ) {
 		hasDuplicate = baseHasDuplicate;
-		results.sort(sortOrder);
+		results.sort( sortOrder );
 
 		if ( hasDuplicate ) {
 			for ( var i = 1; i < results.length; i++ ) {
-				if ( results[i] === results[i-1] ) {
-					results.splice(i--, 1);
+				if ( results[i] === results[ i - 1 ] ) {
+					results.splice( i--, 1 );
 				}
 			}
 		}
@@ -159,27 +187,33 @@ Sizzle.uniqueSort = function(results){
 	return results;
 };
 
-Sizzle.matches = function(expr, set){
-	return Sizzle(expr, null, null, set);
+Sizzle.matches = function( expr, set ) {
+	return Sizzle( expr, null, null, set );
+};
+
+Sizzle.matchesSelector = function( node, expr ) {
+	return Sizzle( expr, null, null, [node] ).length > 0;
 };
 
-Sizzle.find = function(expr, context, isXML){
-	var set, match;
+Sizzle.find = function( expr, context, isXML ) {
+	var set;
 
 	if ( !expr ) {
 		return [];
 	}
 
 	for ( var i = 0, l = Expr.order.length; i < l; i++ ) {
-		var type = Expr.order[i], match;
+		var match,
+			type = Expr.order[i];
 		
 		if ( (match = Expr.leftMatch[ type ].exec( expr )) ) {
 			var left = match[1];
-			match.splice(1,1);
+			match.splice( 1, 1 );
 
 			if ( left.substr( left.length - 1 ) !== "\\" ) {
-				match[1] = (match[1] || "").replace(/\\/g, "");
+				match[1] = (match[1] || "").replace( rBackslash, "" );
 				set = Expr.find[ type ]( match, context, isXML );
+
 				if ( set != null ) {
 					expr = expr.replace( Expr.match[ type ], "" );
 					break;
@@ -189,23 +223,37 @@ Sizzle.find = function(expr, context, isXML){
 	}
 
 	if ( !set ) {
-		set = context.getElementsByTagName("*");
+		set = typeof context.getElementsByTagName !== "undefined" ?
+			context.getElementsByTagName( "*" ) :
+			[];
 	}
 
-	return {set: set, expr: expr};
+	return { set: set, expr: expr };
 };
 
-Sizzle.filter = function(expr, set, inplace, not){
-	var old = expr, result = [], curLoop = set, match, anyFound,
-		isXMLFilter = set && set[0] && isXML(set[0]);
+Sizzle.filter = function( expr, set, inplace, not ) {
+	var match, anyFound,
+		old = expr,
+		result = [],
+		curLoop = set,
+		isXMLFilter = set && set[0] && Sizzle.isXML( set[0] );
 
 	while ( expr && set.length ) {
 		for ( var type in Expr.filter ) {
-			if ( (match = Expr.match[ type ].exec( expr )) != null ) {
-				var filter = Expr.filter[ type ], found, item;
+			if ( (match = Expr.leftMatch[ type ].exec( expr )) != null && match[2] ) {
+				var found, item,
+					filter = Expr.filter[ type ],
+					left = match[1];
+
 				anyFound = false;
 
-				if ( curLoop == result ) {
+				match.splice(1,1);
+
+				if ( left.substr( left.length - 1 ) === "\\" ) {
+					continue;
+				}
+
+				if ( curLoop === result ) {
 					result = [];
 				}
 
@@ -214,6 +262,7 @@ Sizzle.filter = function(expr, set, inplace, not){
 
 					if ( !match ) {
 						anyFound = found = true;
+
 					} else if ( match === true ) {
 						continue;
 					}
@@ -228,9 +277,11 @@ Sizzle.filter = function(expr, set, inplace, not){
 							if ( inplace && found != null ) {
 								if ( pass ) {
 									anyFound = true;
+
 								} else {
 									curLoop[i] = false;
 								}
+
 							} else if ( pass ) {
 								result.push( item );
 								anyFound = true;
@@ -256,9 +307,10 @@ Sizzle.filter = function(expr, set, inplace, not){
 		}
 
 		// Improper expression
-		if ( expr == old ) {
+		if ( expr === old ) {
 			if ( anyFound == null ) {
-				throw "Syntax error, unrecognized expression: " + expr;
+				Sizzle.error( expr );
+
 			} else {
 				break;
 			}
@@ -270,43 +322,55 @@ Sizzle.filter = function(expr, set, inplace, not){
 	return curLoop;
 };
 
+Sizzle.error = function( msg ) {
+	throw "Syntax error, unrecognized expression: " + msg;
+};
+
 var Expr = Sizzle.selectors = {
 	order: [ "ID", "NAME", "TAG" ],
+
 	match: {
-		ID: /#((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
-		CLASS: /\.((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
-		NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF-]|\\.)+)['"]*\]/,
-		ATTR: /\[\s*((?:[\w\u00c0-\uFFFF-]|\\.)+)\s*(?:(\S?=)\s*(['"]*)(.*?)\3|)\s*\]/,
-		TAG: /^((?:[\w\u00c0-\uFFFF\*-]|\\.)+)/,
-		CHILD: /:(only|nth|last|first)-child(?:\((even|odd|[\dn+-]*)\))?/,
-		POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^-]|$)/,
-		PSEUDO: /:((?:[\w\u00c0-\uFFFF-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
+		ID: /#((?:[\w\u00c0-\uFFFF\-]|\\.)+)/,
+		CLASS: /\.((?:[\w\u00c0-\uFFFF\-]|\\.)+)/,
+		NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF\-]|\\.)+)['"]*\]/,
+		ATTR: /\[\s*((?:[\w\u00c0-\uFFFF\-]|\\.)+)\s*(?:(\S?=)\s*(?:(['"])(.*?)\3|(#?(?:[\w\u00c0-\uFFFF\-]|\\.)*)|)|)\s*\]/,
+		TAG: /^((?:[\w\u00c0-\uFFFF\*\-]|\\.)+)/,
+		CHILD: /:(only|nth|last|first)-child(?:\(\s*(even|odd|(?:[+\-]?\d+|(?:[+\-]?\d*)?n\s*(?:[+\-]\s*\d+)?))\s*\))?/,
+		POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^\-]|$)/,
+		PSEUDO: /:((?:[\w\u00c0-\uFFFF\-]|\\.)+)(?:\((['"]?)((?:\([^\)]+\)|[^\(\)]*)+)\2\))?/
 	},
+
 	leftMatch: {},
+
 	attrMap: {
 		"class": "className",
 		"for": "htmlFor"
 	},
+
 	attrHandle: {
-		href: function(elem){
-			return elem.getAttribute("href");
+		href: function( elem ) {
+			return elem.getAttribute( "href" );
+		},
+		type: function( elem ) {
+			return elem.getAttribute( "type" );
 		}
 	},
+
 	relative: {
-		"+": function(checkSet, part, isXML){
+		"+": function(checkSet, part){
 			var isPartStr = typeof part === "string",
-				isTag = isPartStr && !/\W/.test(part),
+				isTag = isPartStr && !rNonWord.test( part ),
 				isPartStrNotTag = isPartStr && !isTag;
 
-			if ( isTag && !isXML ) {
-				part = part.toUpperCase();
+			if ( isTag ) {
+				part = part.toLowerCase();
 			}
 
 			for ( var i = 0, l = checkSet.length, elem; i < l; i++ ) {
 				if ( (elem = checkSet[i]) ) {
 					while ( (elem = elem.previousSibling) && elem.nodeType !== 1 ) {}
 
-					checkSet[i] = isPartStrNotTag || elem && elem.nodeName === part ?
+					checkSet[i] = isPartStrNotTag || elem && elem.nodeName.toLowerCase() === part ?
 						elem || false :
 						elem === part;
 				}
@@ -316,22 +380,29 @@ var Expr = Sizzle.selectors = {
 				Sizzle.filter( part, checkSet, true );
 			}
 		},
-		">": function(checkSet, part, isXML){
-			var isPartStr = typeof part === "string";
 
-			if ( isPartStr && !/\W/.test(part) ) {
-				part = isXML ? part : part.toUpperCase();
+		">": function( checkSet, part ) {
+			var elem,
+				isPartStr = typeof part === "string",
+				i = 0,
+				l = checkSet.length;
+
+			if ( isPartStr && !rNonWord.test( part ) ) {
+				part = part.toLowerCase();
+
+				for ( ; i < l; i++ ) {
+					elem = checkSet[i];
 
-				for ( var i = 0, l = checkSet.length; i < l; i++ ) {
-					var elem = checkSet[i];
 					if ( elem ) {
 						var parent = elem.parentNode;
-						checkSet[i] = parent.nodeName === part ? parent : false;
+						checkSet[i] = parent.nodeName.toLowerCase() === part ? parent : false;
 					}
 				}
+
 			} else {
-				for ( var i = 0, l = checkSet.length; i < l; i++ ) {
-					var elem = checkSet[i];
+				for ( ; i < l; i++ ) {
+					elem = checkSet[i];
+
 					if ( elem ) {
 						checkSet[i] = isPartStr ?
 							elem.parentNode :
@@ -344,37 +415,50 @@ var Expr = Sizzle.selectors = {
 				}
 			}
 		},
+
 		"": function(checkSet, part, isXML){
-			var doneName = done++, checkFn = dirCheck;
+			var nodeCheck,
+				doneName = done++,
+				checkFn = dirCheck;
 
-			if ( !/\W/.test(part) ) {
-				var nodeCheck = part = isXML ? part : part.toUpperCase();
+			if ( typeof part === "string" && !rNonWord.test( part ) ) {
+				part = part.toLowerCase();
+				nodeCheck = part;
 				checkFn = dirNodeCheck;
 			}
 
-			checkFn("parentNode", part, doneName, checkSet, nodeCheck, isXML);
+			checkFn( "parentNode", part, doneName, checkSet, nodeCheck, isXML );
 		},
-		"~": function(checkSet, part, isXML){
-			var doneName = done++, checkFn = dirCheck;
 
-			if ( typeof part === "string" && !/\W/.test(part) ) {
-				var nodeCheck = part = isXML ? part : part.toUpperCase();
+		"~": function( checkSet, part, isXML ) {
+			var nodeCheck,
+				doneName = done++,
+				checkFn = dirCheck;
+
+			if ( typeof part === "string" && !rNonWord.test( part ) ) {
+				part = part.toLowerCase();
+				nodeCheck = part;
 				checkFn = dirNodeCheck;
 			}
 
-			checkFn("previousSibling", part, doneName, checkSet, nodeCheck, isXML);
+			checkFn( "previousSibling", part, doneName, checkSet, nodeCheck, isXML );
 		}
 	},
+
 	find: {
-		ID: function(match, context, isXML){
+		ID: function( match, context, isXML ) {
 			if ( typeof context.getElementById !== "undefined" && !isXML ) {
 				var m = context.getElementById(match[1]);
-				return m ? [m] : [];
+				// Check parentNode to catch when Blackberry 4.6 returns
+				// nodes that are no longer in the document #6963
+				return m && m.parentNode ? [m] : [];
 			}
 		},
-		NAME: function(match, context, isXML){
+
+		NAME: function( match, context ) {
 			if ( typeof context.getElementsByName !== "undefined" ) {
-				var ret = [], results = context.getElementsByName(match[1]);
+				var ret = [],
+					results = context.getElementsByName( match[1] );
 
 				for ( var i = 0, l = results.length; i < l; i++ ) {
 					if ( results[i].getAttribute("name") === match[1] ) {
@@ -385,13 +469,16 @@ var Expr = Sizzle.selectors = {
 				return ret.length === 0 ? null : ret;
 			}
 		},
-		TAG: function(match, context){
-			return context.getElementsByTagName(match[1]);
+
+		TAG: function( match, context ) {
+			if ( typeof context.getElementsByTagName !== "undefined" ) {
+				return context.getElementsByTagName( match[1] );
+			}
 		}
 	},
 	preFilter: {
-		CLASS: function(match, curLoop, inplace, result, not, isXML){
-			match = " " + match[1].replace(/\\/g, "") + " ";
+		CLASS: function( match, curLoop, inplace, result, not, isXML ) {
+			match = " " + match[1].replace( rBackslash, "" ) + " ";
 
 			if ( isXML ) {
 				return match;
@@ -399,9 +486,11 @@ var Expr = Sizzle.selectors = {
 
 			for ( var i = 0, elem; (elem = curLoop[i]) != null; i++ ) {
 				if ( elem ) {
-					if ( not ^ (elem.className && (" " + elem.className + " ").indexOf(match) >= 0) ) {
-						if ( !inplace )
+					if ( not ^ (elem.className && (" " + elem.className + " ").replace(/[\t\n\r]/g, " ").indexOf(match) >= 0) ) {
+						if ( !inplace ) {
 							result.push( elem );
+						}
+
 					} else if ( inplace ) {
 						curLoop[i] = false;
 					}
@@ -410,190 +499,271 @@ var Expr = Sizzle.selectors = {
 
 			return false;
 		},
-		ID: function(match){
-			return match[1].replace(/\\/g, "");
+
+		ID: function( match ) {
+			return match[1].replace( rBackslash, "" );
 		},
-		TAG: function(match, curLoop){
-			for ( var i = 0; curLoop[i] === false; i++ ){}
-			return curLoop[i] && isXML(curLoop[i]) ? match[1] : match[1].toUpperCase();
+
+		TAG: function( match, curLoop ) {
+			return match[1].replace( rBackslash, "" ).toLowerCase();
 		},
-		CHILD: function(match){
-			if ( match[1] == "nth" ) {
+
+		CHILD: function( match ) {
+			if ( match[1] === "nth" ) {
+				if ( !match[2] ) {
+					Sizzle.error( match[0] );
+				}
+
+				match[2] = match[2].replace(/^\+|\s*/g, '');
+
 				// parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'
-				var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
-					match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
+				var test = /(-?)(\d*)(?:n([+\-]?\d*))?/.exec(
+					match[2] === "even" && "2n" || match[2] === "odd" && "2n+1" ||
 					!/\D/.test( match[2] ) && "0n+" + match[2] || match[2]);
 
 				// calculate the numbers (first)n+(last) including if they are negative
 				match[2] = (test[1] + (test[2] || 1)) - 0;
 				match[3] = test[3] - 0;
 			}
+			else if ( match[2] ) {
+				Sizzle.error( match[0] );
+			}
 
 			// TODO: Move to normal caching system
 			match[0] = done++;
 
 			return match;
 		},
-		ATTR: function(match, curLoop, inplace, result, not, isXML){
-			var name = match[1].replace(/\\/g, "");
+
+		ATTR: function( match, curLoop, inplace, result, not, isXML ) {
+			var name = match[1] = match[1].replace( rBackslash, "" );
 			
 			if ( !isXML && Expr.attrMap[name] ) {
 				match[1] = Expr.attrMap[name];
 			}
 
+			// Handle if an un-quoted value was used
+			match[4] = ( match[4] || match[5] || "" ).replace( rBackslash, "" );
+
 			if ( match[2] === "~=" ) {
 				match[4] = " " + match[4] + " ";
 			}
 
 			return match;
 		},
-		PSEUDO: function(match, curLoop, inplace, result, not){
+
+		PSEUDO: function( match, curLoop, inplace, result, not ) {
 			if ( match[1] === "not" ) {
 				// If we're dealing with a complex expression, or a simple one
 				if ( ( chunker.exec(match[3]) || "" ).length > 1 || /^\w/.test(match[3]) ) {
 					match[3] = Sizzle(match[3], null, null, curLoop);
+
 				} else {
 					var ret = Sizzle.filter(match[3], curLoop, inplace, true ^ not);
+
 					if ( !inplace ) {
 						result.push.apply( result, ret );
 					}
+
 					return false;
 				}
+
 			} else if ( Expr.match.POS.test( match[0] ) || Expr.match.CHILD.test( match[0] ) ) {
 				return true;
 			}
 			
 			return match;
 		},
-		POS: function(match){
+
+		POS: function( match ) {
 			match.unshift( true );
+
 			return match;
 		}
 	},
+	
 	filters: {
-		enabled: function(elem){
+		enabled: function( elem ) {
 			return elem.disabled === false && elem.type !== "hidden";
 		},
-		disabled: function(elem){
+
+		disabled: function( elem ) {
 			return elem.disabled === true;
 		},
-		checked: function(elem){
+
+		checked: function( elem ) {
 			return elem.checked === true;
 		},
-		selected: function(elem){
+		
+		selected: function( elem ) {
 			// Accessing this property makes selected-by-default
 			// options in Safari work properly
-			elem.parentNode.selectedIndex;
+			if ( elem.parentNode ) {
+				elem.parentNode.selectedIndex;
+			}
+			
 			return elem.selected === true;
 		},
-		parent: function(elem){
+
+		parent: function( elem ) {
 			return !!elem.firstChild;
 		},
-		empty: function(elem){
+
+		empty: function( elem ) {
 			return !elem.firstChild;
 		},
-		has: function(elem, i, match){
+
+		has: function( elem, i, match ) {
 			return !!Sizzle( match[3], elem ).length;
 		},
-		header: function(elem){
-			return /h\d/i.test( elem.nodeName );
+
+		header: function( elem ) {
+			return (/h\d/i).test( elem.nodeName );
 		},
-		text: function(elem){
-			return "text" === elem.type;
+
+		text: function( elem ) {
+			var attr = elem.getAttribute( "type" ), type = elem.type;
+			// IE6 and 7 will map elem.type to 'text' for new HTML5 types (search, etc) 
+			// use getAttribute instead to test this case
+			return elem.nodeName.toLowerCase() === "input" && "text" === type && ( attr === type || attr === null );
 		},
-		radio: function(elem){
-			return "radio" === elem.type;
+
+		radio: function( elem ) {
+			return elem.nodeName.toLowerCase() === "input" && "radio" === elem.type;
 		},
-		checkbox: function(elem){
-			return "checkbox" === elem.type;
+
+		checkbox: function( elem ) {
+			return elem.nodeName.toLowerCase() === "input" && "checkbox" === elem.type;
 		},
-		file: function(elem){
-			return "file" === elem.type;
+
+		file: function( elem ) {
+			return elem.nodeName.toLowerCase() === "input" && "file" === elem.type;
+		},
+
+		password: function( elem ) {
+			return elem.nodeName.toLowerCase() === "input" && "password" === elem.type;
 		},
-		password: function(elem){
-			return "password" === elem.type;
+
+		submit: function( elem ) {
+			var name = elem.nodeName.toLowerCase();
+			return (name === "input" || name === "button") && "submit" === elem.type;
 		},
-		submit: function(elem){
-			return "submit" === elem.type;
+
+		image: function( elem ) {
+			return elem.nodeName.toLowerCase() === "input" && "image" === elem.type;
 		},
-		image: function(elem){
-			return "image" === elem.type;
+
+		reset: function( elem ) {
+			var name = elem.nodeName.toLowerCase();
+			return (name === "input" || name === "button") && "reset" === elem.type;
 		},
-		reset: function(elem){
-			return "reset" === elem.type;
+
+		button: function( elem ) {
+			var name = elem.nodeName.toLowerCase();
+			return name === "input" && "button" === elem.type || name === "button";
 		},
-		button: function(elem){
-			return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
+
+		input: function( elem ) {
+			return (/input|select|textarea|button/i).test( elem.nodeName );
 		},
-		input: function(elem){
-			return /input|select|textarea|button/i.test(elem.nodeName);
+
+		focus: function( elem ) {
+			return elem === elem.ownerDocument.activeElement;
 		}
 	},
 	setFilters: {
-		first: function(elem, i){
+		first: function( elem, i ) {
 			return i === 0;
 		},
-		last: function(elem, i, match, array){
+
+		last: function( elem, i, match, array ) {
 			return i === array.length - 1;
 		},
-		even: function(elem, i){
+
+		even: function( elem, i ) {
 			return i % 2 === 0;
 		},
-		odd: function(elem, i){
+
+		odd: function( elem, i ) {
 			return i % 2 === 1;
 		},
-		lt: function(elem, i, match){
+
+		lt: function( elem, i, match ) {
 			return i < match[3] - 0;
 		},
-		gt: function(elem, i, match){
+
+		gt: function( elem, i, match ) {
 			return i > match[3] - 0;
 		},
-		nth: function(elem, i, match){
-			return match[3] - 0 == i;
+
+		nth: function( elem, i, match ) {
+			return match[3] - 0 === i;
 		},
-		eq: function(elem, i, match){
-			return match[3] - 0 == i;
+
+		eq: function( elem, i, match ) {
+			return match[3] - 0 === i;
 		}
 	},
 	filter: {
-		PSEUDO: function(elem, match, i, array){
-			var name = match[1], filter = Expr.filters[ name ];
+		PSEUDO: function( elem, match, i, array ) {
+			var name = match[1],
+				filter = Expr.filters[ name ];
 
 			if ( filter ) {
 				return filter( elem, i, match, array );
+
 			} else if ( name === "contains" ) {
-				return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
+				return (elem.textContent || elem.innerText || Sizzle.getText([ elem ]) || "").indexOf(match[3]) >= 0;
+
 			} else if ( name === "not" ) {
 				var not = match[3];
 
-				for ( var i = 0, l = not.length; i < l; i++ ) {
-					if ( not[i] === elem ) {
+				for ( var j = 0, l = not.length; j < l; j++ ) {
+					if ( not[j] === elem ) {
 						return false;
 					}
 				}
 
 				return true;
+
+			} else {
+				Sizzle.error( name );
 			}
 		},
-		CHILD: function(elem, match){
-			var type = match[1], node = elem;
-			switch (type) {
-				case 'only':
-				case 'first':
-					while ( (node = node.previousSibling) )  {
-						if ( node.nodeType === 1 ) return false;
+
+		CHILD: function( elem, match ) {
+			var type = match[1],
+				node = elem;
+
+			switch ( type ) {
+				case "only":
+				case "first":
+					while ( (node = node.previousSibling) )	 {
+						if ( node.nodeType === 1 ) { 
+							return false; 
+						}
 					}
-					if ( type == 'first') return true;
+
+					if ( type === "first" ) { 
+						return true; 
+					}
+
 					node = elem;
-				case 'last':
-					while ( (node = node.nextSibling) )  {
-						if ( node.nodeType === 1 ) return false;
+
+				case "last":
+					while ( (node = node.nextSibling) )	 {
+						if ( node.nodeType === 1 ) { 
+							return false; 
+						}
 					}
+
 					return true;
-				case 'nth':
-					var first = match[2], last = match[3];
 
-					if ( first == 1 && last == 0 ) {
+				case "nth":
+					var first = match[2],
+						last = match[3];
+
+					if ( first === 1 && last === 0 ) {
 						return true;
 					}
 					
@@ -602,33 +772,41 @@ var Expr = Sizzle.selectors = {
 	
 					if ( parent && (parent.sizcache !== doneName || !elem.nodeIndex) ) {
 						var count = 0;
+						
 						for ( node = parent.firstChild; node; node = node.nextSibling ) {
 							if ( node.nodeType === 1 ) {
 								node.nodeIndex = ++count;
 							}
 						} 
+
 						parent.sizcache = doneName;
 					}
 					
 					var diff = elem.nodeIndex - last;
-					if ( first == 0 ) {
-						return diff == 0;
+
+					if ( first === 0 ) {
+						return diff === 0;
+
 					} else {
-						return ( diff % first == 0 && diff / first >= 0 );
+						return ( diff % first === 0 && diff / first >= 0 );
 					}
 			}
 		},
-		ID: function(elem, match){
+
+		ID: function( elem, match ) {
 			return elem.nodeType === 1 && elem.getAttribute("id") === match;
 		},
-		TAG: function(elem, match){
-			return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
+
+		TAG: function( elem, match ) {
+			return (match === "*" && elem.nodeType === 1) || elem.nodeName.toLowerCase() === match;
 		},
-		CLASS: function(elem, match){
+		
+		CLASS: function( elem, match ) {
 			return (" " + (elem.className || elem.getAttribute("class")) + " ")
 				.indexOf( match ) > -1;
 		},
-		ATTR: function(elem, match){
+
+		ATTR: function( elem, match ) {
 			var name = match[1],
 				result = Expr.attrHandle[ name ] ?
 					Expr.attrHandle[ name ]( elem ) :
@@ -650,7 +828,7 @@ var Expr = Sizzle.selectors = {
 				!check ?
 				value && result !== false :
 				type === "!=" ?
-				value != check :
+				value !== check :
 				type === "^=" ?
 				value.indexOf(check) === 0 :
 				type === "$=" ?
@@ -659,8 +837,10 @@ var Expr = Sizzle.selectors = {
 				value === check || value.substr(0, check.length + 1) === check + "-" :
 				false;
 		},
-		POS: function(elem, match, i, array){
-			var name = match[2], filter = Expr.setFilters[ name ];
+
+		POS: function( elem, match, i, array ) {
+			var name = match[2],
+				filter = Expr.setFilters[ name ];
 
 			if ( filter ) {
 				return filter( elem, i, match, array );
@@ -669,14 +849,17 @@ var Expr = Sizzle.selectors = {
 	}
 };
 
-var origPOS = Expr.match.POS;
+var origPOS = Expr.match.POS,
+	fescape = function(all, num){
+		return "\\" + (num - 0 + 1);
+	};
 
 for ( var type in Expr.match ) {
-	Expr.match[ type ] = new RegExp( Expr.match[ type ].source + /(?![^\[]*\])(?![^\(]*\))/.source );
-	Expr.leftMatch[ type ] = new RegExp( /(^(?:.|\r|\n)*?)/.source + Expr.match[ type ].source );
+	Expr.match[ type ] = new RegExp( Expr.match[ type ].source + (/(?![^\[]*\])(?![^\(]*\))/.source) );
+	Expr.leftMatch[ type ] = new RegExp( /(^(?:.|\r|\n)*?)/.source + Expr.match[ type ].source.replace(/\\(\d+)/g, fescape) );
 }
 
-var makeArray = function(array, results) {
+var makeArray = function( array, results ) {
 	array = Array.prototype.slice.call( array, 0 );
 
 	if ( results ) {
@@ -689,23 +872,28 @@ var makeArray = function(array, results) {
 
 // Perform a simple check to determine if the browser is capable of
 // converting a NodeList to an array using builtin methods.
+// Also verifies that the returned array holds DOM nodes
+// (which is not the case in the Blackberry browser)
 try {
-	Array.prototype.slice.call( document.documentElement.childNodes, 0 );
+	Array.prototype.slice.call( document.documentElement.childNodes, 0 )[0].nodeType;
 
 // Provide a fallback method if it does not work
-} catch(e){
-	makeArray = function(array, results) {
-		var ret = results || [];
+} catch( e ) {
+	makeArray = function( array, results ) {
+		var i = 0,
+			ret = results || [];
 
 		if ( toString.call(array) === "[object Array]" ) {
 			Array.prototype.push.apply( ret, array );
+
 		} else {
 			if ( typeof array.length === "number" ) {
-				for ( var i = 0, l = array.length; i < l; i++ ) {
+				for ( var l = array.length; i < l; i++ ) {
 					ret.push( array[i] );
 				}
+
 			} else {
-				for ( var i = 0; array[i]; i++ ) {
+				for ( ; array[i]; i++ ) {
 					ret.push( array[i] );
 				}
 			}
@@ -715,90 +903,161 @@ try {
 	};
 }
 
-var sortOrder;
+var sortOrder, siblingCheck;
 
 if ( document.documentElement.compareDocumentPosition ) {
 	sortOrder = function( a, b ) {
-		if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
-			if ( a == b ) {
-				hasDuplicate = true;
-			}
+		if ( a === b ) {
+			hasDuplicate = true;
 			return 0;
 		}
 
-		var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
-		if ( ret === 0 ) {
-			hasDuplicate = true;
+		if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
+			return a.compareDocumentPosition ? -1 : 1;
 		}
-		return ret;
+
+		return a.compareDocumentPosition(b) & 4 ? -1 : 1;
 	};
-} else if ( "sourceIndex" in document.documentElement ) {
+
+} else {
 	sortOrder = function( a, b ) {
-		if ( !a.sourceIndex || !b.sourceIndex ) {
-			if ( a == b ) {
-				hasDuplicate = true;
-			}
+		// The nodes are identical, we can exit early
+		if ( a === b ) {
+			hasDuplicate = true;
 			return 0;
+
+		// Fallback to using sourceIndex (in IE) if it's available on both nodes
+		} else if ( a.sourceIndex && b.sourceIndex ) {
+			return a.sourceIndex - b.sourceIndex;
 		}
 
-		var ret = a.sourceIndex - b.sourceIndex;
-		if ( ret === 0 ) {
-			hasDuplicate = true;
+		var al, bl,
+			ap = [],
+			bp = [],
+			aup = a.parentNode,
+			bup = b.parentNode,
+			cur = aup;
+
+		// If the nodes are siblings (or identical) we can do a quick check
+		if ( aup === bup ) {
+			return siblingCheck( a, b );
+
+		// If no parents were found then the nodes are disconnected
+		} else if ( !aup ) {
+			return -1;
+
+		} else if ( !bup ) {
+			return 1;
 		}
-		return ret;
-	};
-} else if ( document.createRange ) {
-	sortOrder = function( a, b ) {
-		if ( !a.ownerDocument || !b.ownerDocument ) {
-			if ( a == b ) {
-				hasDuplicate = true;
+
+		// Otherwise they're somewhere else in the tree so we need
+		// to build up a full list of the parentNodes for comparison
+		while ( cur ) {
+			ap.unshift( cur );
+			cur = cur.parentNode;
+		}
+
+		cur = bup;
+
+		while ( cur ) {
+			bp.unshift( cur );
+			cur = cur.parentNode;
+		}
+
+		al = ap.length;
+		bl = bp.length;
+
+		// Start walking down the tree looking for a discrepancy
+		for ( var i = 0; i < al && i < bl; i++ ) {
+			if ( ap[i] !== bp[i] ) {
+				return siblingCheck( ap[i], bp[i] );
 			}
-			return 0;
 		}
 
-		var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
-		aRange.setStart(a, 0);
-		aRange.setEnd(a, 0);
-		bRange.setStart(b, 0);
-		bRange.setEnd(b, 0);
-		var ret = aRange.compareBoundaryPoints(Range.START_TO_END, bRange);
-		if ( ret === 0 ) {
-			hasDuplicate = true;
+		// We ended someplace up the tree so do a sibling check
+		return i === al ?
+			siblingCheck( a, bp[i], -1 ) :
+			siblingCheck( ap[i], b, 1 );
+	};
+
+	siblingCheck = function( a, b, ret ) {
+		if ( a === b ) {
+			return ret;
 		}
-		return ret;
+
+		var cur = a.nextSibling;
+
+		while ( cur ) {
+			if ( cur === b ) {
+				return -1;
+			}
+
+			cur = cur.nextSibling;
+		}
+
+		return 1;
 	};
 }
 
+// Utility function for retreiving the text value of an array of DOM nodes
+Sizzle.getText = function( elems ) {
+	var ret = "", elem;
+
+	for ( var i = 0; elems[i]; i++ ) {
+		elem = elems[i];
+
+		// Get the text from text nodes and CDATA nodes
+		if ( elem.nodeType === 3 || elem.nodeType === 4 ) {
+			ret += elem.nodeValue;
+
+		// Traverse everything else, except comment nodes
+		} else if ( elem.nodeType !== 8 ) {
+			ret += Sizzle.getText( elem.childNodes );
+		}
+	}
+
+	return ret;
+};
+
 // Check to see if the browser returns elements by name when
 // querying by getElementById (and provide a workaround)
 (function(){
 	// We're going to inject a fake input element with a specified name
 	var form = document.createElement("div"),
-		id = "script" + (new Date).getTime();
+		id = "script" + (new Date()).getTime(),
+		root = document.documentElement;
+
 	form.innerHTML = "<a name='" + id + "'/>";
 
 	// Inject it into the root element, check its status, and remove it quickly
-	var root = document.documentElement;
 	root.insertBefore( form, root.firstChild );
 
 	// The workaround has to do additional checks after a getElementById
 	// Which slows things down for other browsers (hence the branching)
-	if ( !!document.getElementById( id ) ) {
-		Expr.find.ID = function(match, context, isXML){
+	if ( document.getElementById( id ) ) {
+		Expr.find.ID = function( match, context, isXML ) {
 			if ( typeof context.getElementById !== "undefined" && !isXML ) {
 				var m = context.getElementById(match[1]);
-				return m ? m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
+
+				return m ?
+					m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ?
+						[m] :
+						undefined :
+					[];
 			}
 		};
 
-		Expr.filter.ID = function(elem, match){
+		Expr.filter.ID = function( elem, match ) {
 			var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
+
 			return elem.nodeType === 1 && node && node.nodeValue === match;
 		};
 	}
 
 	root.removeChild( form );
-	root = form = null; // release memory in IE
+
+	// release memory in IE
+	root = form = null;
 })();
 
 (function(){
@@ -811,8 +1070,8 @@ if ( document.documentElement.compareDocumentPosition ) {
 
 	// Make sure no comments are found
 	if ( div.getElementsByTagName("*").length > 0 ) {
-		Expr.find.TAG = function(match, context){
-			var results = context.getElementsByTagName(match[1]);
+		Expr.find.TAG = function( match, context ) {
+			var results = context.getElementsByTagName( match[1] );
 
 			// Filter out possible comments
 			if ( match[1] === "*" ) {
@@ -833,83 +1092,209 @@ if ( document.documentElement.compareDocumentPosition ) {
 
 	// Check to see if an attribute returns normalized href attributes
 	div.innerHTML = "<a href='#'></a>";
+
 	if ( div.firstChild && typeof div.firstChild.getAttribute !== "undefined" &&
 			div.firstChild.getAttribute("href") !== "#" ) {
-		Expr.attrHandle.href = function(elem){
-			return elem.getAttribute("href", 2);
+
+		Expr.attrHandle.href = function( elem ) {
+			return elem.getAttribute( "href", 2 );
 		};
 	}
 
-	div = null; // release memory in IE
+	// release memory in IE
+	div = null;
 })();
 
-if ( document.querySelectorAll ) (function(){
-	var oldSizzle = Sizzle, div = document.createElement("div");
-	div.innerHTML = "<p class='TEST'></p>";
+if ( document.querySelectorAll ) {
+	(function(){
+		var oldSizzle = Sizzle,
+			div = document.createElement("div"),
+			id = "__sizzle__";
 
-	// Safari can't handle uppercase or unicode characters when
-	// in quirks mode.
-	if ( div.querySelectorAll && div.querySelectorAll(".TEST").length === 0 ) {
-		return;
-	}
-	
-	Sizzle = function(query, context, extra, seed){
-		context = context || document;
+		div.innerHTML = "<p class='TEST'></p>";
 
-		// Only use querySelectorAll on non-XML documents
-		// (ID selectors don't work in non-HTML documents)
-		if ( !seed && context.nodeType === 9 && !isXML(context) ) {
-			try {
-				return makeArray( context.querySelectorAll(query), extra );
-			} catch(e){}
+		// Safari can't handle uppercase or unicode characters when
+		// in quirks mode.
+		if ( div.querySelectorAll && div.querySelectorAll(".TEST").length === 0 ) {
+			return;
 		}
+	
+		Sizzle = function( query, context, extra, seed ) {
+			context = context || document;
+
+			// Only use querySelectorAll on non-XML documents
+			// (ID selectors don't work in non-HTML documents)
+			if ( !seed && !Sizzle.isXML(context) ) {
+				// See if we find a selector to speed up
+				var match = /^(\w+$)|^\.([\w\-]+$)|^#([\w\-]+$)/.exec( query );
+				
+				if ( match && (context.nodeType === 1 || context.nodeType === 9) ) {
+					// Speed-up: Sizzle("TAG")
+					if ( match[1] ) {
+						return makeArray( context.getElementsByTagName( query ), extra );
+					
+					// Speed-up: Sizzle(".CLASS")
+					} else if ( match[2] && Expr.find.CLASS && context.getElementsByClassName ) {
+						return makeArray( context.getElementsByClassName( match[2] ), extra );
+					}
+				}
+				
+				if ( context.nodeType === 9 ) {
+					// Speed-up: Sizzle("body")
+					// The body element only exists once, optimize finding it
+					if ( query === "body" && context.body ) {
+						return makeArray( [ context.body ], extra );
+						
+					// Speed-up: Sizzle("#ID")
+					} else if ( match && match[3] ) {
+						var elem = context.getElementById( match[3] );
+
+						// Check parentNode to catch when Blackberry 4.6 returns
+						// nodes that are no longer in the document #6963
+						if ( elem && elem.parentNode ) {
+							// Handle the case where IE and Opera return items
+							// by name instead of ID
+							if ( elem.id === match[3] ) {
+								return makeArray( [ elem ], extra );
+							}
+							
+						} else {
+							return makeArray( [], extra );
+						}
+					}
+					
+					try {
+						return makeArray( context.querySelectorAll(query), extra );
+					} catch(qsaError) {}
+
+				// qSA works strangely on Element-rooted queries
+				// We can work around this by specifying an extra ID on the root
+				// and working up from there (Thanks to Andrew Dupont for the technique)
+				// IE 8 doesn't work on object elements
+				} else if ( context.nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
+					var oldContext = context,
+						old = context.getAttribute( "id" ),
+						nid = old || id,
+						hasParent = context.parentNode,
+						relativeHierarchySelector = /^\s*[+~]/.test( query );
+
+					if ( !old ) {
+						context.setAttribute( "id", nid );
+					} else {
+						nid = nid.replace( /'/g, "\\$&" );
+					}
+					if ( relativeHierarchySelector && hasParent ) {
+						context = context.parentNode;
+					}
+
+					try {
+						if ( !relativeHierarchySelector || hasParent ) {
+							return makeArray( context.querySelectorAll( "[id='" + nid + "'] " + query ), extra );
+						}
+
+					} catch(pseudoError) {
+					} finally {
+						if ( !old ) {
+							oldContext.removeAttribute( "id" );
+						}
+					}
+				}
+			}
 		
-		return oldSizzle(query, context, extra, seed);
-	};
+			return oldSizzle(query, context, extra, seed);
+		};
 
-	for ( var prop in oldSizzle ) {
-		Sizzle[ prop ] = oldSizzle[ prop ];
-	}
+		for ( var prop in oldSizzle ) {
+			Sizzle[ prop ] = oldSizzle[ prop ];
+		}
+
+		// release memory in IE
+		div = null;
+	})();
+}
 
-	div = null; // release memory in IE
+(function(){
+	var html = document.documentElement,
+		matches = html.matchesSelector || html.mozMatchesSelector || html.webkitMatchesSelector || html.msMatchesSelector;
+
+	if ( matches ) {
+		// Check to see if it's possible to do matchesSelector
+		// on a disconnected node (IE 9 fails this)
+		var disconnectedMatch = !matches.call( document.createElement( "div" ), "div" ),
+			pseudoWorks = false;
+
+		try {
+			// This should fail with an exception
+			// Gecko does not error, returns false instead
+			matches.call( document.documentElement, "[test!='']:sizzle" );
+	
+		} catch( pseudoError ) {
+			pseudoWorks = true;
+		}
+
+		Sizzle.matchesSelector = function( node, expr ) {
+			// Make sure that attribute selectors are quoted
+			expr = expr.replace(/\=\s*([^'"\]]*)\s*\]/g, "='$1']");
+
+			if ( !Sizzle.isXML( node ) ) {
+				try { 
+					if ( pseudoWorks || !Expr.match.PSEUDO.test( expr ) && !/!=/.test( expr ) ) {
+						var ret = matches.call( node, expr );
+
+						// IE 9's matchesSelector returns false on disconnected nodes
+						if ( ret || !disconnectedMatch ||
+								// As well, disconnected nodes are said to be in a document
+								// fragment in IE 9, so check for that
+								node.document && node.document.nodeType !== 11 ) {
+							return ret;
+						}
+					}
+				} catch(e) {}
+			}
+
+			return Sizzle(expr, null, null, [node]).length > 0;
+		};
+	}
 })();
 
-if ( document.getElementsByClassName && document.documentElement.getElementsByClassName ) (function(){
+(function(){
 	var div = document.createElement("div");
+
 	div.innerHTML = "<div class='test e'></div><div class='test'></div>";
 
 	// Opera can't find a second classname (in 9.6)
-	if ( div.getElementsByClassName("e").length === 0 )
+	// Also, make sure that getElementsByClassName actually exists
+	if ( !div.getElementsByClassName || div.getElementsByClassName("e").length === 0 ) {
 		return;
+	}
 
 	// Safari caches class attributes, doesn't catch changes (in 3.2)
 	div.lastChild.className = "e";
 
-	if ( div.getElementsByClassName("e").length === 1 )
+	if ( div.getElementsByClassName("e").length === 1 ) {
 		return;
-
+	}
+	
 	Expr.order.splice(1, 0, "CLASS");
-	Expr.find.CLASS = function(match, context, isXML) {
+	Expr.find.CLASS = function( match, context, isXML ) {
 		if ( typeof context.getElementsByClassName !== "undefined" && !isXML ) {
 			return context.getElementsByClassName(match[1]);
 		}
 	};
 
-	div = null; // release memory in IE
+	// release memory in IE
+	div = null;
 })();
 
 function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
-	var sibDir = dir == "previousSibling" && !isXML;
 	for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 		var elem = checkSet[i];
+
 		if ( elem ) {
-			if ( sibDir && elem.nodeType === 1 ){
-				elem.sizcache = doneName;
-				elem.sizset = i;
-			}
-			elem = elem[dir];
 			var match = false;
 
+			elem = elem[dir];
+
 			while ( elem ) {
 				if ( elem.sizcache === doneName ) {
 					match = checkSet[elem.sizset];
@@ -921,7 +1306,7 @@ function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
 					elem.sizset = i;
 				}
 
-				if ( elem.nodeName === cur ) {
+				if ( elem.nodeName.toLowerCase() === cur ) {
 					match = elem;
 					break;
 				}
@@ -935,16 +1320,13 @@ function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
 }
 
 function dirCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
-	var sibDir = dir == "previousSibling" && !isXML;
 	for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 		var elem = checkSet[i];
+
 		if ( elem ) {
-			if ( sibDir && elem.nodeType === 1 ) {
-				elem.sizcache = doneName;
-				elem.sizset = i;
-			}
-			elem = elem[dir];
 			var match = false;
+			
+			elem = elem[dir];
 
 			while ( elem ) {
 				if ( elem.sizcache === doneName ) {
@@ -957,6 +1339,7 @@ function dirCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
 						elem.sizcache = doneName;
 						elem.sizset = i;
 					}
+
 					if ( typeof cur !== "string" ) {
 						if ( elem === cur ) {
 							match = true;
@@ -977,19 +1360,34 @@ function dirCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
 	}
 }
 
-var contains = document.compareDocumentPosition ?  function(a, b){
-	return a.compareDocumentPosition(b) & 16;
-} : function(a, b){
-	return a !== b && (a.contains ? a.contains(b) : true);
-};
+if ( document.documentElement.contains ) {
+	Sizzle.contains = function( a, b ) {
+		return a !== b && (a.contains ? a.contains(b) : true);
+	};
+
+} else if ( document.documentElement.compareDocumentPosition ) {
+	Sizzle.contains = function( a, b ) {
+		return !!(a.compareDocumentPosition(b) & 16);
+	};
+
+} else {
+	Sizzle.contains = function() {
+		return false;
+	};
+}
+
+Sizzle.isXML = function( elem ) {
+	// documentElement is verified for cases where it doesn't yet exist
+	// (such as loading iframes in IE - #4833) 
+	var documentElement = (elem ? elem.ownerDocument || elem : 0).documentElement;
 
-var isXML = function(elem){
-	return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
-		!!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
+	return documentElement ? documentElement.nodeName !== "HTML" : false;
 };
 
-var posProcess = function(selector, context){
-	var tmpSet = [], later = "", match,
+var posProcess = function( selector, context ) {
+	var match,
+		tmpSet = [],
+		later = "",
 		root = context.nodeType ? [context] : context;
 
 	// Position selectors must be done after the filter