1 files changed, 33 insertions, 15 deletions

diff --git a/src/traversing.js b/src/traversing.js
index fe2e33d88..fb5946bba 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -17,17 +17,30 @@ var runtil = /Until$/,
 
 jQuery.fn.extend({
 	find: function( selector ) {
+		var self = this,
+			i, l;
+
+		if ( typeof selector !== "string" ) {
+			return jQuery( selector ).filter(function() {
+				for ( i = 0, l = self.length; i < l; i++ ) {
+					if ( jQuery.contains( self[ i ], this ) ) {
+						return true;
+					}
+				}
+			});
+		}
+
 		var ret = this.pushStack( "", "find", selector ),
-			length = 0;
+			length, n, r;
 
-		for ( var i = 0, l = this.length; i < l; i++ ) {
+		for ( i = 0, l = this.length; i < l; i++ ) {
 			length = ret.length;
 			jQuery.find( selector, this[i], ret );
 
 			if ( i > 0 ) {
 				// Make sure that the results are unique
-				for ( var n = length; n < ret.length; n++ ) {
-					for ( var r = 0; r < length; r++ ) {
+				for ( n = length; n < ret.length; n++ ) {
+					for ( r = 0; r < length; r++ ) {
 						if ( ret[r] === ret[n] ) {
 							ret.splice(n--, 1);
 							break;
@@ -60,12 +73,15 @@ jQuery.fn.extend({
 	},
 
 	is: function( selector ) {
-		return !!selector && jQuery.filter( selector, this ).length > 0;
+		return !!selector && (typeof selector === "string" ?
+			jQuery.filter( selector, this ).length > 0 :
+			this.filter( selector ).length > 0);
 	},
 
 	closest: function( selectors, context ) {
 		var ret = [], i, l, cur = this[0];
-
+		
+		// Array
 		if ( jQuery.isArray( selectors ) ) {
 			var match, selector,
 				matches = {},
@@ -75,8 +91,8 @@ jQuery.fn.extend({
 				for ( i = 0, l = selectors.length; i < l; i++ ) {
 					selector = selectors[i];
 
-					if ( !matches[selector] ) {
-						matches[selector] = jQuery.expr.match.POS.test( selector ) ?
+					if ( !matches[ selector ] ) {
+						matches[ selector ] = POS.test( selector ) ?
 							jQuery( selector, context || this.context ) :
 							selector;
 					}
@@ -84,9 +100,9 @@ jQuery.fn.extend({
 
 				while ( cur && cur.ownerDocument && cur !== context ) {
 					for ( selector in matches ) {
-						match = matches[selector];
+						match = matches[ selector ];
 
-						if ( match.jquery ? match.index(cur) > -1 : jQuery(cur).is(match) ) {
+						if ( match.jquery ? match.index( cur ) > -1 : jQuery( cur ).is( match ) ) {
 							ret.push({ selector: selector, elem: cur, level: level });
 						}
 					}
@@ -99,8 +115,10 @@ jQuery.fn.extend({
 			return ret;
 		}
 
-		var pos = POS.test( selectors ) ?
-			jQuery( selectors, context || this.context ) : null;
+		// String
+		var pos = POS.test( selectors ) || typeof selectors !== "string" ?
+				jQuery( selectors, context || this.context ) :
+				0;
 
 		for ( i = 0, l = this.length; i < l; i++ ) {
 			cur = this[i];
@@ -112,14 +130,14 @@ jQuery.fn.extend({
 
 				} else {
 					cur = cur.parentNode;
-					if ( !cur || !cur.ownerDocument || cur === context ) {
+					if ( !cur || !cur.ownerDocument || cur === context || cur.nodeType === 11 ) {
 						break;
 					}
 				}
 			}
 		}
 
-		ret = ret.length > 1 ? jQuery.unique(ret) : ret;
+		ret = ret.length > 1 ? jQuery.unique( ret ) : ret;
 
 		return this.pushStack( ret, "closest", selectors );
 	},
@@ -286,7 +304,7 @@ function winnow( elements, qualifier, keep ) {
 			return retVal === keep;
 		});
 
-	} else if ( qualifier.nodeType ) {
+	} else if ( qualifier && qualifier.nodeType ) {
 		return jQuery.grep(elements, function( elem, i ) {
 			return (elem === qualifier) === keep;
 		});