Merge remote branch 'upstream/master'

14 files changed, 477 insertions, 290 deletions

diff --git a/src/ajax.js b/src/ajax.js
index 645163ad2..871481d01 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -175,11 +175,12 @@ jQuery.extend({
 		timeout: 0,
 		data: null,
 		dataType: null,
-		dataTypes: null,
 		username: null,
 		password: null,
 		cache: null,
 		traditional: false,
+		headers: {},
+		crossDomain: null,
 		*/
 		xhr: function() {
 			return new window.XMLHttpRequest();
@@ -306,30 +307,35 @@ jQuery.extend({
 				// (match is used internally)
 				getResponseHeader: function( key , match ) {
 
-					if ( state !== 2 ) {
-						return null;
-					}
+					if ( state === 2 ) {
 
-					if ( responseHeaders === undefined ) {
+						if ( responseHeaders === undefined ) {
 
-						responseHeaders = {};
+							responseHeaders = {};
 
-						if ( typeof responseHeadersString === "string" ) {
+							if ( typeof responseHeadersString === "string" ) {
 
-							while( ( match = rheaders.exec( responseHeadersString ) ) ) {
-								responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+								while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+									responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+								}
 							}
 						}
+						match = responseHeaders[ key.toLowerCase() ];
+
+					} else {
+
+						match = null;
 					}
-					return responseHeaders[ key.toLowerCase() ];
+
+					return match;
 				},
 
 				// Cancel the request
 				abort: function( statusText ) {
-					if ( transport && state !== 2 ) {
+					if ( transport ) {
 						transport.abort( statusText || "abort" );
-						done( 0 , statusText );
 					}
+					done( 0 , statusText );
 					return this;
 				}
 			};
@@ -347,6 +353,10 @@ jQuery.extend({
 			// State is "done" now
 			state = 2;
 
+			// Dereference transport for early garbage collection
+			// (no matter how long the jXHR transport will be used
+			transport = 0;
+
 			// Set readyState
 			jXHR.readyState = status ? 4 : 0;
 
@@ -574,12 +584,6 @@ jQuery.extend({
 		// Remove hash character (#7531: and string promotion)
 		s.url = ( "" + s.url ).replace( rhash , "" );
 
-		// Uppercase the type
-		s.type = s.type.toUpperCase();
-
-		// Determine if request has content
-		s.hasContent = ! rnoContent.test( s.type );
-
 		// Extract dataTypes list
 		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 
@@ -595,88 +599,97 @@ jQuery.extend({
 		}
 
 		// Convert data if not already a string
-		if ( s.data && s.processData && typeof s.data != "string" ) {
+		if ( s.data && s.processData && typeof s.data !== "string" ) {
 			s.data = jQuery.param( s.data , s.traditional );
 		}
 
-		// Get transport
-		transport = jQuery.ajaxPrefilter( s , options ).ajaxTransport( s );
+		// Apply prefilters
+		jQuery.ajaxPrefilter( s , options );
+
+		// Uppercase the type
+		s.type = s.type.toUpperCase();
+
+		// Determine if request has content
+		s.hasContent = ! rnoContent.test( s.type );
 
 		// Watch for a new set of requests
 		if ( s.global && jQuery.active++ === 0 ) {
 			jQuery.event.trigger( "ajaxStart" );
 		}
 
-		// If no transport, we auto-abort
-		if ( ! transport ) {
+		// More options handling for requests with no content
+		if ( ! s.hasContent ) {
 
-			done( 0 , "transport not found" );
-			jXHR = false;
-
-		} else {
+			// If data is available, append data to url
+			if ( s.data ) {
+				s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
+			}
 
-			// More options handling for requests with no content
-			if ( ! s.hasContent ) {
+			// Add anti-cache in url if needed
+			if ( s.cache === false ) {
 
-				// If data is available, append data to url
-				if ( s.data ) {
-					s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
-				}
+				var ts = jQuery.now(),
+					// try replacing _= if it is there
+					ret = s.url.replace( rts , "$1_=" + ts );
 
-				// Add anti-cache in url if needed
-				if ( s.cache === false ) {
+				// if nothing was replaced, add timestamp to the end
+				s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
+			}
+		}
 
-					var ts = jQuery.now(),
-						// try replacing _= if it is there
-						ret = s.url.replace( rts , "$1_=" + ts );
+		// Set the correct header, if data is being sent
+		if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
+			requestHeaders[ "content-type" ] = s.contentType;
+		}
 
-					// if nothing was replaced, add timestamp to the end
-					s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
-				}
+		// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+		if ( s.ifModified ) {
+			if ( jQuery_lastModified[ s.url ] ) {
+				requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 			}
-
-			// Set the correct header, if data is being sent
-			if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
-				requestHeaders[ "content-type" ] = s.contentType;
+			if ( jQuery_etag[ s.url ] ) {
+				requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 			}
+		}
 
-			// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
-			if ( s.ifModified ) {
-				if ( jQuery_lastModified[ s.url ] ) {
-					requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
-				}
-				if ( jQuery_etag[ s.url ] ) {
-					requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
-				}
-			}
+		// Set the Accepts header for the server, depending on the dataType
+		requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
+			s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
+			s.accepts[ "*" ];
+
+		// Check for headers option
+		for ( i in s.headers ) {
+			requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
+		}
+
+		// Allow custom headers/mimetypes and early abort
+		if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
+
+				// Abort if not done already
+				done( 0 , "abort" );
 
-			// Set the Accepts header for the server, depending on the dataType
-			requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
-				s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
-				s.accepts[ "*" ];
+				// Return false
+				jXHR = false;
 
-			// Check for headers option
-			for ( i in s.headers ) {
-				requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
+		} else {
+
+			// Install callbacks on deferreds
+			for ( i in { success:1, error:1, complete:1 } ) {
+				jXHR[ i ]( s[ i ] );
 			}
 
-			// Allow custom headers/mimetypes and early abort
-			if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
+			// Get transport
+			transport = jQuery.ajaxTransport( s );
+
+			// If no transport, we auto-abort
+			if ( ! transport ) {
 
-					// Abort if not done already
-					done( 0 , "abort" );
-					jXHR = false;
+				done( 0 , "notransport" );
 
 			} else {
 
 				// Set state as sending
-				state = 1;
-				jXHR.readyState = 1;
-
-				// Install callbacks on deferreds
-				for ( i in { success:1, error:1, complete:1 } ) {
-					jXHR[ i ]( s[ i ] );
-				}
+				state = jXHR.readyState = 1;
 
 				// Send global event
 				if ( s.global ) {
diff --git a/src/ajax/jsonp.js b/src/ajax/jsonp.js
index 1df5dd427..883876fc0 100644
--- a/src/ajax/jsonp.js
+++ b/src/ajax/jsonp.js
@@ -1,8 +1,7 @@
 (function( jQuery ) {
 
 var jsc = jQuery.now(),
-	jsre = /(\=)(?:\?|%3F)(&|$)|()(?:\?\?|%3F%3F)()/i,
-	rquery_jsonp = /\?/;
+	jsre = /(\=)(?:\?|%3F)(&|$)|()(?:\?\?|%3F%3F)()/i;
 
 // Default jsonp settings
 jQuery.ajaxSetup({
@@ -11,73 +10,77 @@ jQuery.ajaxSetup({
 		return "jsonp" + jsc++;
 	}
 
-// Normalize jsonp queries
-// 1) put callback parameter in url or data
-// 2) sneakily ensure transportDataType is always jsonp for jsonp requests
-}).ajaxPrefilter("json jsonp", function(s, originalSettings) {
+// Detect, normalize options and install callbacks for jsonp requests
+// (dataIsString is used internally)
+}).ajaxPrefilter("json jsonp", function(s, originalSettings, dataIsString) {
+
+	dataIsString = ( typeof(s.data) === "string" );
 
 	if ( s.dataTypes[ 0 ] === "jsonp" ||
-		originalSettings.jsonp ||
 		originalSettings.jsonpCallback ||
-		jsre.test(s.url) ||
-		typeof(s.data) === "string" && jsre.test(s.data) ) {
+		originalSettings.jsonp != null ||
+		s.jsonp !== false && ( jsre.test( s.url ) ||
+				dataIsString && jsre.test( s.data ) ) ) {
 
-		var jsonpCallback = s.jsonpCallback =
+		var responseContainer,
+			jsonpCallback = s.jsonpCallback =
 				jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
-			url = s.url.replace(jsre, "$1" + jsonpCallback + "$2"),
-			data = s.url === url && typeof(s.data) === "string" ? s.data.replace(jsre, "$1" + jsonpCallback + "$2") : s.data;
-
-		if ( url === s.url && data === s.data ) {
-			url += (rquery_jsonp.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
+			previous = window[ jsonpCallback ],
+			url = s.url,
+			data = s.data,
+			replace = "$1" + jsonpCallback + "$2";
+
+		if ( s.jsonp !== false ) {
+			url = url.replace( jsre, replace );
+			if ( s.url === url ) {
+				if ( dataIsString ) {
+					data = data.replace( jsre, replace );
+				}
+				if ( s.data === data ) {
+					// Add callback manually
+					url += (/\?/.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
+				}
+			}
 		}
 
 		s.url = url;
 		s.data = data;
-		s.dataTypes[ 0 ] = "jsonp";
-	}
-
-// Bind transport to jsonp dataType
-}).ajaxTransport("jsonp", function(s) {
 
-	// Put callback in place
-	var responseContainer,
-		jsonpCallback = s.jsonpCallback,
-		previous = window[ jsonpCallback ];
+		window [ jsonpCallback ] = function( response ) {
+			responseContainer = [response];
+		};
 
-	window [ jsonpCallback ] = function( response ) {
-		responseContainer = [response];
-	};
+		s.complete = [function() {
 
-	s.complete = [function() {
+			// Set callback back to previous value
+			window[ jsonpCallback ] = previous;
 
-		// Set callback back to previous value
-		window[ jsonpCallback ] = previous;
-
-		// Call if it was a function and we have a response
-		if ( previous) {
-			if ( responseContainer && jQuery.isFunction ( previous ) ) {
-				window[ jsonpCallback ] ( responseContainer[0] );
+			// Call if it was a function and we have a response
+			if ( previous) {
+				if ( responseContainer && jQuery.isFunction ( previous ) ) {
+					window[ jsonpCallback ] ( responseContainer[0] );
+				}
+			} else {
+				// else, more memory leak avoidance
+				try{ delete window[ jsonpCallback ]; } catch(e){}
 			}
-		} else {
-			// else, more memory leak avoidance
-			try{ delete window[ jsonpCallback ]; } catch(e){}
-		}
 
-	}, s.complete ];
+		}, s.complete ];
 
-	// Sneakily ensure this will be handled as json
-	s.dataTypes[ 0 ] = "json";
+		// Use data converter to retrieve json after script execution
+		s.converters["script json"] = function() {
+			if ( ! responseContainer ) {
+				jQuery.error( jsonpCallback + " was not called" );
+			}
+			return responseContainer[ 0 ];
+		};
 
-	// Use data converter to retrieve json after script execution
-	s.converters["script json"] = function() {
-		if ( ! responseContainer ) {
-			jQuery.error( jsonpCallback + " was not called" );
-		}
-		return responseContainer[ 0 ];
-	};
+		// force json dataType
+		s.dataTypes[ 0 ] = "json";
 
-	// Delegate to script transport
-	return "script";
+		// Delegate to script
+		return "script";
+	}
 });
 
 })( jQuery );
diff --git a/src/ajax/script.js b/src/ajax/script.js
index 8e2e89ac5..b0e576f27 100644
--- a/src/ajax/script.js
+++ b/src/ajax/script.js
@@ -15,18 +15,23 @@ jQuery.ajaxSetup({
 		"text script": jQuery.globalEval
 	}
 
-// Bind script tag hack transport
-}).ajaxTransport("script", function(s) {
+// Handle cache's special case and global
+}).ajaxPrefilter("script", function(s) {
 
-	// Handle cache special case
 	if ( s.cache === undefined ) {
 		s.cache = false;
 	}
 
-	// This transport only deals with cross domain get requests
-	if ( s.crossDomain && s.async && ( s.type === "GET" || ! s.data ) ) {
-
+	if ( s.crossDomain ) {
+		s.type = "GET";
 		s.global = false;
+	}
+
+// Bind script tag hack transport
+}).ajaxTransport("script", function(s) {
+
+	// This transport only deals with cross domain requests
+	if ( s.crossDomain ) {
 
 		var script,
 			head = document.getElementsByTagName("head")[0] || document.documentElement;
diff --git a/src/attributes.js b/src/attributes.js
index fec132340..d37400a68 100644
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -133,11 +133,11 @@ jQuery.fn.extend({
 			} else if ( type === "undefined" || type === "boolean" ) {
 				if ( this.className ) {
 					// store className if set
-					jQuery.data( this, "__className__", this.className );
+					jQuery._data( this, "__className__", this.className );
 				}
 
 				// toggle whole className
-				this.className = this.className || value === false ? "" : jQuery.data( this, "__className__" ) || "";
+				this.className = this.className || value === false ? "" : jQuery._data( this, "__className__" ) || "";
 			}
 		});
 	},
diff --git a/src/core.js b/src/core.js
index 4361577e2..f116ef4d1 100644
--- a/src/core.js
+++ b/src/core.js
@@ -3,7 +3,7 @@ var jQuery = (function() {
 // Define a local copy of jQuery
 var jQuery = function( selector, context ) {
 		// The jQuery object is actually just the init constructor 'enhanced'
-		return new jQuery.fn.init( selector, context );
+		return new jQuery.fn.init( selector, context, rootjQuery );
 	},
 
 	// Map over jQuery in case of overwrite
@@ -19,12 +19,8 @@ var jQuery = function( selector, context ) {
 	// (both of which we optimize for)
 	quickExpr = /^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,
 
-	// Is it a simple selector
-	isSimple = /^.[^:#\[\.,]*$/,
-
 	// Check if a string has a non-whitespace character in it
 	rnotwhite = /\S/,
-	rwhite = /\s/,
 
 	// Used for trimming whitespace
 	trimLeft = /^\s+/,
@@ -63,6 +59,9 @@ var jQuery = function( selector, context ) {
 	// The deferred used on DOM ready
 	readyList,
 
+	// Promise methods
+	promiseMethods = "then done fail isResolved isRejected promise".split( " " ),
+
 	// The ready event handler
 	DOMContentLoaded,
 
@@ -78,7 +77,8 @@ var jQuery = function( selector, context ) {
 	class2type = {};
 
 jQuery.fn = jQuery.prototype = {
-	init: function( selector, context ) {
+	constructor: jQuery,
+	init: function( selector, context, rootjQuery ) {
 		var match, elem, ret, doc;
 
 		// Handle $(""), $(null), or $(undefined)
@@ -112,6 +112,7 @@ jQuery.fn = jQuery.prototype = {
 
 				// HANDLE: $(html) -> $(array)
 				if ( match[1] ) {
+					context = context instanceof jQuery ? context[0] : context;
 					doc = (context ? context.ownerDocument || context : document);
 
 					// If a single string is passed in and it's a single tag
@@ -171,7 +172,7 @@ jQuery.fn = jQuery.prototype = {
 			// HANDLE: $(expr, context)
 			// (which is just equivalent to: $(context).find(expr)
 			} else {
-				return jQuery( context ).find( selector );
+				return this.constructor( context ).find( selector );
 			}
 
 		// HANDLE: $(function)
@@ -222,7 +223,7 @@ jQuery.fn = jQuery.prototype = {
 	// (returning the new matched element set)
 	pushStack: function( elems, name, selector ) {
 		// Build a new jQuery matched element set
-		var ret = jQuery();
+		var ret = this.constructor();
 
 		if ( jQuery.isArray( elems ) ) {
 			push.apply( ret, elems );
@@ -287,7 +288,7 @@ jQuery.fn = jQuery.prototype = {
 	},
 
 	end: function() {
-		return this.prevObject || jQuery(null);
+		return this.prevObject || this.constructor(null);
 	},
 
 	// For internal use only.
@@ -578,7 +579,7 @@ jQuery.extend({
 
 			script.type = "text/javascript";
 
-			if ( jQuery.support.scriptEval ) {
+			if ( jQuery.support.scriptEval() ) {
 				script.appendChild( document.createTextNode( data ) );
 			} else {
 				script.text = data;
@@ -896,9 +897,10 @@ jQuery.extend({
 	Deferred: function( func ) {
 
 		var deferred = jQuery._Deferred(),
-			failDeferred = jQuery._Deferred();
+			failDeferred = jQuery._Deferred(),
+			promise;
 
-		// Add errorDeferred methods and redefine cancel
+		// Add errorDeferred methods, then and promise
 		jQuery.extend( deferred , {
 
 			then: function( doneCallbacks , failCallbacks ) {
@@ -911,14 +913,18 @@ jQuery.extend({
 			isRejected: failDeferred.isResolved,
 			// Get a promise for this deferred
 			// If obj is provided, the promise aspect is added to the object
-			promise: function( obj ) {
-				obj = obj || {};
-				jQuery.each( "then done fail isResolved isRejected".split( " " ) , function( _ , method ) {
-					obj[ method ] = deferred[ method ];
-				});
-				obj.promise = function() {
-					return obj;
-				};
+			// (i is used internally)
+			promise: function( obj , i ) {
+				if ( obj == null ) {
+					if ( promise ) {
+						return promise;
+					}
+					promise = obj = {};
+				}
+				i = promiseMethods.length;
+				while( i-- ) {
+					obj[ promiseMethods[ i ] ] = deferred[ promiseMethods[ i ] ];
+				}
 				return obj;
 			}
 
@@ -940,10 +946,32 @@ jQuery.extend({
 
 	// Deferred helper
 	when: function( object ) {
-		object = object && jQuery.isFunction( object.promise ) ?
-			object :
-			jQuery.Deferred().resolve( object );
-		return object.promise();
+		var args = arguments,
+			length = args.length,
+			deferred = length <= 1 && object && jQuery.isFunction( object.promise ) ?
+				object :
+				jQuery.Deferred(),
+			promise = deferred.promise(),
+			resolveArray;
+
+		if ( length > 1 ) {
+			resolveArray = new Array( length );
+			jQuery.each( args, function( index, element, args ) {
+				jQuery.when( element ).done( function( value ) {
+					args = arguments;
+					resolveArray[ index ] = args.length > 1 ? slice.call( args , 0 ) : value;
+					if( ! --length ) {
+						deferred.fire( promise, resolveArray );
+					}
+				}).fail( function() {
+					deferred.fireReject( promise, arguments );
+				});
+				return !deferred.isRejected();
+			});
+		} else if ( deferred !== object ) {
+			deferred.resolve( object );
+		}
+		return promise;
 	},
 
 	// Use of jQuery.browser is frowned upon.
@@ -960,6 +988,25 @@ jQuery.extend({
 		return { browser: match[1] || "", version: match[2] || "0" };
 	},
 
+	subclass: function(){
+		function jQuerySubclass( selector, context ) {
+			return new jQuerySubclass.fn.init( selector, context );
+		}
+		jQuerySubclass.superclass = this;
+		jQuerySubclass.fn = jQuerySubclass.prototype = this();
+		jQuerySubclass.fn.constructor = jQuerySubclass;
+		jQuerySubclass.subclass = this.subclass;
+		jQuerySubclass.fn.init = function init( selector, context ) {
+			if (context && context instanceof jQuery && !(context instanceof jQuerySubclass)){
+				context = jQuerySubclass(context);
+			}
+			return jQuery.fn.init.call( this, selector, context, rootjQuerySubclass );
+		};
+		jQuerySubclass.fn.init.prototype = jQuerySubclass.fn;
+		var rootjQuerySubclass = jQuerySubclass(document);
+		return jQuerySubclass;
+	},
+
 	browser: {}
 });
 
@@ -988,9 +1035,8 @@ if ( indexOf ) {
 	};
 }
 
-// Verify that \s matches non-breaking spaces
-// (IE fails on this test)
-if ( !rwhite.test( "\xA0" ) ) {
+// IE doesn't match non-breaking spaces with \s
+if ( rnotwhite.test( "\xA0" ) ) {
 	trimLeft = /^[\s\xA0]+/;
 	trimRight = /[\s\xA0]+$/;
 }
diff --git a/src/css.js b/src/css.js
index a6e2bb614..19c6342d2 100644
--- a/src/css.js
+++ b/src/css.js
@@ -12,6 +12,9 @@ var ralpha = /alpha\([^)]*\)/i,
 	cssHeight = [ "Top", "Bottom" ],
 	curCSS,
 
+	getComputedStyle,
+	currentStyle,
+
 	fcamelCase = function( all, letter ) {
 		return letter.toUpperCase();
 	};
@@ -169,6 +172,10 @@ jQuery.each(["height", "width"], function( i, name ) {
 				if ( val <= 0 ) {
 					val = curCSS( elem, name, name );
 
+					if ( val === "0px" && currentStyle ) {
+						val = currentStyle( elem, name, name );
+					}
+
 					if ( val != null ) {
 						// Should return "auto" instead of 0, use 0 for
 						// temporary backwards-compat
@@ -234,7 +241,7 @@ if ( !jQuery.support.opacity ) {
 }
 
 if ( document.defaultView && document.defaultView.getComputedStyle ) {
-	curCSS = function( elem, newName, name ) {
+	getComputedStyle = function( elem, newName, name ) {
 		var ret, defaultView, computedStyle;
 
 		name = name.replace( rupper, "-$1" ).toLowerCase();
@@ -252,10 +259,13 @@ if ( document.defaultView && document.defaultView.getComputedStyle ) {
 
 		return ret;
 	};
-} else if ( document.documentElement.currentStyle ) {
-	curCSS = function( elem, name ) {
-		var left, rsLeft,
+}
+
+if ( document.documentElement.currentStyle ) {
+	currentStyle = function( elem, name ) {
+		var left, 
 			ret = elem.currentStyle && elem.currentStyle[ name ],
+			rsLeft = elem.runtimeStyle && elem.runtimeStyle[ name ],
 			style = elem.style;
 
 		// From the awesome hack by Dean Edwards
@@ -266,22 +276,27 @@ if ( document.defaultView && document.defaultView.getComputedStyle ) {
 		if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 			// Remember the original values
 			left = style.left;
-			rsLeft = elem.runtimeStyle.left;
 
 			// Put in the new values to get a computed value out
-			elem.runtimeStyle.left = elem.currentStyle.left;
+			if ( rsLeft ) {
+				elem.runtimeStyle.left = elem.currentStyle.left;
+			}
 			style.left = name === "fontSize" ? "1em" : (ret || 0);
 			ret = style.pixelLeft + "px";
 
 			// Revert the changed values
 			style.left = left;
-			elem.runtimeStyle.left = rsLeft;
+			if ( rsLeft ) {
+				elem.runtimeStyle.left = rsLeft;
+			}
 		}
 
 		return ret === "" ? "auto" : ret;
 	};
 }
 
+curCSS = getComputedStyle || currentStyle;
+
 function getWH( elem, name, extra ) {
 	var which = name === "width" ? cssWidth : cssHeight,
 		val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
diff --git a/src/data.js b/src/data.js
index 4d1d1bd55..21f0e3a55 100644
--- a/src/data.js
+++ b/src/data.js
@@ -1,7 +1,6 @@
 (function( jQuery ) {
 
-var windowData = {},
-	rbrace = /^(?:\{.*\}|\[.*\])$/;
+var rbrace = /^(?:\{.*\}|\[.*\])$/;
 
 jQuery.extend({
 	cache: {},
@@ -23,110 +22,170 @@ jQuery.extend({
 	},
 
 	hasData: function( elem ) {
-		if ( elem.nodeType ) {
-			elem = jQuery.cache[ elem[jQuery.expando] ];
-		}
+		elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
 
 		return !!elem && !jQuery.isEmptyObject(elem);
 	},
 
-	data: function( elem, name, data ) {
+	data: function( elem, name, data, pvt /* Internal Use Only */ ) {
 		if ( !jQuery.acceptData( elem ) ) {
 			return;
 		}
 
-		elem = elem == window ?
-			windowData :
-			elem;
+		var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
+
+			// We have to handle DOM nodes and JS objects differently because IE6-7
+			// can't GC object references properly across the DOM-JS boundary
+			isNode = elem.nodeType,
+
+			// Only DOM nodes need the global jQuery cache; JS object data is
+			// attached directly to the object so GC can occur automatically
+			cache = isNode ? jQuery.cache : elem,
 
-		var isNode = elem.nodeType,
-			id = isNode ? elem[ jQuery.expando ] : null,
-			cache = jQuery.cache, thisCache;
+			// Only defining an ID for JS objects if its cache already exists allows
+			// the code to shortcut on the same path as a DOM node with no cache
+			id = isNode ? elem[ jQuery.expando ] : elem[ jQuery.expando ] && jQuery.expando;
 
-		if ( isNode && !id && typeof name === "string" && data === undefined ) {
+		// Avoid doing any more work than we need to when trying to get data on an
+		// object that has no data at all
+		if ( (!id || (pvt && id && !cache[ id ][ internalKey ])) && getByName && data === undefined ) {
 			return;
 		}
 
-		// Get the data from the object directly
-		if ( !isNode ) {
-			cache = elem;
+		if ( !id ) {
+			// Only DOM nodes need a new unique ID for each element since their data
+			// ends up in the global cache
+			if ( isNode ) {
+				elem[ jQuery.expando ] = id = ++jQuery.uuid;
+			} else {
+				id = jQuery.expando;
+			}
+		}
 
-		// Compute a unique ID for the element
-		} else if ( !id ) {
-			elem[ jQuery.expando ] = id = ++jQuery.uuid;
+		if ( !cache[ id ] ) {
+			cache[ id ] = {};
 		}
 
-		// Avoid generating a new cache unless none exists and we
-		// want to manipulate it.
+		// An object can be passed to jQuery.data instead of a key/value pair; this gets
+		// shallow copied over onto the existing cache
 		if ( typeof name === "object" ) {
-			if ( isNode ) {
+			if ( pvt ) {
+				cache[ id ][ internalKey ] = jQuery.extend(cache[ id ][ internalKey ], name);
+			} else {
 				cache[ id ] = jQuery.extend(cache[ id ], name);
+			}
+		}
 
-			} else {
-				jQuery.extend( cache, name );
+		thisCache = cache[ id ];
+
+		// Internal jQuery data is stored in a separate object inside the object's data
+		// cache in order to avoid key collisions between internal data and user-defined
+		// data
+		if ( pvt ) {
+			if ( !thisCache[ internalKey ] ) {
+				thisCache[ internalKey ] = {};
 			}
 
-		} else if ( isNode && !cache[ id ] ) {
-			cache[ id ] = {};
+			thisCache = thisCache[ internalKey ];
 		}
 
-		thisCache = isNode ? cache[ id ] : cache;
-
-		// Prevent overriding the named cache with undefined values
 		if ( data !== undefined ) {
 			thisCache[ name ] = data;
 		}
 
-		return typeof name === "string" ? thisCache[ name ] : thisCache;
+		// TODO: This is a hack for 1.5 ONLY. It will be removed in 1.6. Users should
+		// not attempt to inspect the internal events object using jQuery.data, as this
+		// internal data object is undocumented and subject to change.
+		if ( name === "events" && !thisCache[name] ) {
+			return thisCache[ internalKey ] && thisCache[ internalKey ].events;
+		}
+
+		return getByName ? thisCache[ name ] : thisCache;
 	},
 
-	removeData: function( elem, name ) {
+	removeData: function( elem, name, pvt /* Internal Use Only */ ) {
 		if ( !jQuery.acceptData( elem ) ) {
 			return;
 		}
 
-		elem = elem == window ?
-			windowData :
-			elem;
+		var internalKey = jQuery.expando, isNode = elem.nodeType,
+
+			// See jQuery.data for more information
+			cache = isNode ? jQuery.cache : elem,
 
-		var isNode = elem.nodeType,
-			id = isNode ? elem[ jQuery.expando ] : elem,
-			cache = jQuery.cache,
-			thisCache = isNode ? cache[ id ] : id;
+			// See jQuery.data for more information
+			id = isNode ? elem[ jQuery.expando ] : jQuery.expando;
+
+		// If there is already no cache entry for this object, there is no
+		// purpose in continuing
+		if ( !cache[ id ] ) {
+			return;
+		}
 
-		// If we want to remove a specific section of the element's data
 		if ( name ) {
+			var thisCache = pvt ? cache[ id ][ internalKey ] : cache[ id ];
+
 			if ( thisCache ) {
-				// Remove the section of cache data
 				delete thisCache[ name ];
 
-				// If we've removed all the data, remove the element's cache
-				if ( isNode && jQuery.isEmptyObject(thisCache) ) {
-					jQuery.removeData( elem );
+				// If there is no data left in the cache, we want to continue
+				// and let the cache object itself get destroyed
+				if ( !jQuery.isEmptyObject(thisCache) ) {
+					return;
 				}
 			}
+		}
+
+		// See jQuery.data for more information
+		if ( pvt ) {
+			delete cache[ id ][ internalKey ];
+
+			// Don't destroy the parent cache unless the internal data object
+			// had been the only thing left in it
+			if ( !jQuery.isEmptyObject(cache[ id ]) ) {
+				return;
+			}
+		}
+
+		var internalCache = cache[ id ][ internalKey ];
 
-		// Otherwise, we want to remove all of the element's data
+		// Browsers that fail expando deletion also refuse to delete expandos on
+		// the window, but it will allow it on all other JS objects; other browsers
+		// don't care
+		if ( jQuery.support.deleteExpando || cache != window ) {
+			delete cache[ id ];
 		} else {
-			if ( isNode && jQuery.support.deleteExpando ) {
-				delete elem[ jQuery.expando ];
+			cache[ id ] = null;
+		}
 
+		// We destroyed the entire user cache at once because it's faster than
+		// iterating through each key, but we need to continue to persist internal
+		// data if it existed
+		if ( internalCache ) {
+			cache[ id ] = {};
+			cache[ id ][ internalKey ] = internalCache;
+
+		// Otherwise, we need to eliminate the expando on the node to avoid
+		// false lookups in the cache for entries that no longer exist
+		} else if ( isNode ) {
+			// IE does not allow us to delete expando properties from nodes,
+			// nor does it have a removeAttribute function on Document nodes;
+			// we must handle all of these cases
+			if ( jQuery.support.deleteExpando ) {
+				delete elem[ jQuery.expando ];
 			} else if ( elem.removeAttribute ) {
 				elem.removeAttribute( jQuery.expando );
-
-			// Completely remove the data cache
-			} else if ( isNode ) {
-				delete cache[ id ];
-
-			// Remove all fields from the object
 			} else {
-				for ( var n in elem ) {
-					delete elem[ n ];
-				}
+				elem[ jQuery.expando ] = null;
 			}
 		}
 	},
 
+	// For internal use only.
+	_data: function( elem, name, data ) {
+		return jQuery.data( elem, name, data, true );
+	},
+
 	// A method for determining if a DOM node can handle the data expando
 	acceptData: function( elem ) {
 		if ( elem.nodeName ) {
diff --git a/src/effects.js b/src/effects.js
index bd57ffc3d..b0675395f 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -27,7 +27,7 @@ jQuery.fn.extend({
 
 				// Reset the inline display of this element to learn if it is
 				// being hidden by cascaded rules or not
-				if ( !jQuery.data(elem, "olddisplay") && display === "none" ) {
+				if ( !jQuery._data(elem, "olddisplay") && display === "none" ) {
 					display = elem.style.display = "";
 				}
 
@@ -35,7 +35,7 @@ jQuery.fn.extend({
 				// in a stylesheet to whatever the default browser style is
 				// for such an element
 				if ( display === "" && jQuery.css( elem, "display" ) === "none" ) {
-					jQuery.data(elem, "olddisplay", defaultDisplay(elem.nodeName));
+					jQuery._data(elem, "olddisplay", defaultDisplay(elem.nodeName));
 				}
 			}
 
@@ -46,7 +46,7 @@ jQuery.fn.extend({
 				display = elem.style.display;
 
 				if ( display === "" || display === "none" ) {
-					elem.style.display = jQuery.data(elem, "olddisplay") || "";
+					elem.style.display = jQuery._data(elem, "olddisplay") || "";
 				}
 			}
 
@@ -62,8 +62,8 @@ jQuery.fn.extend({
 			for ( var i = 0, j = this.length; i < j; i++ ) {
 				var display = jQuery.css( this[i], "display" );
 
-				if ( display !== "none" && !jQuery.data( this[i], "olddisplay" ) ) {
-					jQuery.data( this[i], "olddisplay", display );
+				if ( display !== "none" && !jQuery._data( this[i], "olddisplay" ) ) {
+					jQuery._data( this[i], "olddisplay", display );
 				}
 			}
 
diff --git a/src/event.js b/src/event.js
index 675e5fff3..2ddf28812 100644
--- a/src/event.js
+++ b/src/event.js
@@ -8,7 +8,8 @@ var rnamespaces = /\.(.*)$/,
 	fcleanup = function( nm ) {
 		return nm.replace(rescape, "\\$&");
 	},
-	focusCounts = { focusin: 0, focusout: 0 };
+	focusCounts = { focusin: 0, focusout: 0 },
+	eventKey = "events";
 
 /*
  * A number of helper functions used for managing events.
@@ -50,7 +51,7 @@ jQuery.event = {
 		}
 
 		// Init the element's event structure
-		var elemData = jQuery.data( elem );
+		var elemData = jQuery._data( elem );
 
 		// If no elemData is found then we must be trying to bind to one of the
 		// banned noData elements
@@ -58,10 +59,7 @@ jQuery.event = {
 			return;
 		}
 
-		// Use a key less likely to result in collisions for plain JS objects.
-		// Fixes bug #7150.
-		var eventKey = elem.nodeType ? "events" : "__events__",
-			events = elemData[ eventKey ],
+		var events = elemData[ eventKey ],
 			eventHandle = elemData.handle;
 
 		if ( typeof events === "function" ) {
@@ -177,8 +175,7 @@ jQuery.event = {
 		}
 
 		var ret, type, fn, j, i = 0, all, namespaces, namespace, special, eventType, handleObj, origType,
-			eventKey = elem.nodeType ? "events" : "__events__",
-			elemData = jQuery.data( elem ),
+			elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
 			events = elemData && elemData[ eventKey ];
 
 		if ( !elemData || !events ) {
@@ -290,10 +287,10 @@ jQuery.event = {
 			delete elemData.handle;
 
 			if ( typeof elemData === "function" ) {
-				jQuery.removeData( elem, eventKey );
+				jQuery.removeData( elem, eventKey, true );
 
 			} else if ( jQuery.isEmptyObject( elemData ) ) {
-				jQuery.removeData( elem );
+				jQuery.removeData( elem, undefined, true );
 			}
 		}
 	},
@@ -325,9 +322,16 @@ jQuery.event = {
 
 				// Only trigger if we've ever bound an event for it
 				if ( jQuery.event.global[ type ] ) {
+					// XXX This code smells terrible. event.js should not be directly
+					// inspecting the data cache
 					jQuery.each( jQuery.cache, function() {
-						if ( this.events && this.events[type] ) {
-							jQuery.event.trigger( event, data, this.handle.elem );
+						// internalKey variable is just used to make it easier to find
+						// and potentially change this stuff later; currently it just
+						// points to jQuery.expando
+						var internalKey = jQuery.expando,
+							internalCache = this[ internalKey ];
+						if ( internalCache && internalCache.events && internalCache.events[type] ) {
+							jQuery.event.trigger( event, data, internalCache.handle.elem );
 						}
 					});
 				}
@@ -353,8 +357,8 @@ jQuery.event = {
 
 		// Trigger the event, it is assumed that "handle" is a function
 		var handle = elem.nodeType ?
-			jQuery.data( elem, "handle" ) :
-			(jQuery.data( elem, "__events__" ) || {}).handle;
+			jQuery._data( elem, "handle" ) :
+			(jQuery._data( elem, eventKey ) || {}).handle;
 
 		if ( handle ) {
 			handle.apply( elem, data );
@@ -432,7 +436,7 @@ jQuery.event = {
 
 		event.namespace = event.namespace || namespace_sort.join(".");
 
-		events = jQuery.data(this, this.nodeType ? "events" : "__events__");
+		events = jQuery._data(this, eventKey);
 
 		if ( typeof events === "function" ) {
 			events = events.events;
@@ -603,7 +607,7 @@ jQuery.Event = function( src ) {
 
 		// Events bubbling up the document may have been marked as prevented
 		// by a handler lower down the tree; reflect the correct value.
-		this.isDefaultPrevented = (src.defaultPrevented || src.returnValue === false ||
+		this.isDefaultPrevented = (src.defaultPrevented || src.returnValue === false || 
 			src.getPreventDefault && src.getPreventDefault()) ? returnTrue : returnFalse;
 
 	// Event type
@@ -787,12 +791,12 @@ if ( !jQuery.support.changeBubbles ) {
 			return;
 		}
 
-		data = jQuery.data( elem, "_change_data" );
+		data = jQuery._data( elem, "_change_data" );
 		val = getVal(elem);
 
 		// the current data will be also retrieved by beforeactivate
 		if ( e.type !== "focusout" || elem.type !== "radio" ) {
-			jQuery.data( elem, "_change_data", val );
+			jQuery._data( elem, "_change_data", val );
 		}
 
 		if ( data === undefined || val === data ) {
@@ -837,7 +841,7 @@ if ( !jQuery.support.changeBubbles ) {
 			// information
 			beforeactivate: function( e ) {
 				var elem = e.target;
-				jQuery.data( elem, "_change_data", getVal(elem) );
+				jQuery._data( elem, "_change_data", getVal(elem) );
 			}
 		},
 
@@ -986,8 +990,8 @@ jQuery.fn.extend({
 
 		return this.click( jQuery.proxy( fn, function( event ) {
 			// Figure out which function to execute
-			var lastToggle = ( jQuery.data( this, "lastToggle" + fn.guid ) || 0 ) % i;
-			jQuery.data( this, "lastToggle" + fn.guid, lastToggle + 1 );
+			var lastToggle = ( jQuery._data( this, "lastToggle" + fn.guid ) || 0 ) % i;
+			jQuery._data( this, "lastToggle" + fn.guid, lastToggle + 1 );
 
 			// Make sure that clicks stop
 			event.preventDefault();
@@ -1075,7 +1079,7 @@ function liveHandler( event ) {
 	var stop, maxLevel, related, match, handleObj, elem, j, i, l, data, close, namespace, ret,
 		elems = [],
 		selectors = [],
-		events = jQuery.data( this, this.nodeType ? "events" : "__events__" );
+		events = jQuery._data( this, eventKey );
 
 	if ( typeof events === "function" ) {
 		events = events.events;
diff --git a/src/manipulation.js b/src/manipulation.js
index cf533c818..596a45736 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -346,7 +346,7 @@ jQuery.fn.extend({
 						table ?
 							root(this[i], first) :
 							this[i],
-						i > 0 || results.cacheable || this.length > 1  ?
+						i > 0 || results.cacheable || (this.length > 1 && i > 0) ?
 							jQuery(fragment).clone(true)[0] :
 							fragment
 					);
@@ -381,17 +381,24 @@ function cloneCopyEvent(orig, ret) {
 			throw "Cloned data mismatch";
 		}
 
-		var oldData = jQuery.data( orig[nodeIndex] ),
-			curData = jQuery.data( this, oldData ),
-			events = oldData && oldData.events;
+		var internalKey = jQuery.expando,
+			oldData = jQuery.data( orig[nodeIndex] ),
+			curData = jQuery.data( this, oldData );
 
-		if ( events ) {
-			delete curData.handle;
-			curData.events = {};
+		// Switch to use the internal data object, if it exists, for the next
+		// stage of data copying
+		if ( (oldData = oldData[ internalKey ]) ) {
+			var events = oldData.events;
+			curData = curData[ internalKey ] = jQuery.extend({}, oldData);
 
-			for ( var type in events ) {
-				for ( var i = 0, l = events[ type ].length; i < l; i++ ) {
-					jQuery.event.add( this, type, events[ type ][ i ], events[ type ][ i ].data );
+			if ( events ) {
+				delete curData.handle;
+				curData.events = {};
+
+				for ( var type in events ) {
+					for ( var i = 0, l = events[ type ].length; i < l; i++ ) {
+						jQuery.event.add( this, type, events[ type ][ i ], events[ type ][ i ].data );
+					}
 				}
 			}
 		}
@@ -608,8 +615,7 @@ jQuery.extend({
 	},
 
 	cleanData: function( elems ) {
-		var data, id, cache = jQuery.cache,
-			special = jQuery.event.special,
+		var data, id, cache = jQuery.cache, internalKey = jQuery.expando, special = jQuery.event.special,
 			deleteExpando = jQuery.support.deleteExpando;
 
 		for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
@@ -620,13 +626,14 @@ jQuery.extend({
 			id = elem[ jQuery.expando ];
 
 			if ( id ) {
-				data = cache[ id ];
+				data = cache[ id ] && cache[ id ][ internalKey ];
 
 				if ( data && data.events ) {
 					for ( var type in data.events ) {
 						if ( special[ type ] ) {
 							jQuery.event.remove( elem, type );
 
+						// This is a shortcut to avoid jQuery.event.remove's overhead
 						} else {
 							jQuery.removeEvent( elem, type, data.handle );
 						}
diff --git a/src/offset.js b/src/offset.js
index 2040c9d83..a10d30a0f 100644
--- a/src/offset.js
+++ b/src/offset.js
@@ -30,7 +30,7 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 
 		// Make sure we're not dealing with a disconnected DOM node
 		if ( !box || !jQuery.contains( docElem, elem ) ) {
-			return box || { top: 0, left: 0 };
+			return box ? { top: box.top, left: box.left } : { top: 0, left: 0 };
 		}
 
 		var body = doc.body,
diff --git a/src/queue.js b/src/queue.js
index 735b0e189..9e3e2fb52 100644
--- a/src/queue.js
+++ b/src/queue.js
@@ -7,7 +7,7 @@ jQuery.extend({
 		}
 
 		type = (type || "fx") + "queue";
-		var q = jQuery.data( elem, type );
+		var q = jQuery._data( elem, type );
 
 		// Speed up dequeue by getting out quickly if this is just a lookup
 		if ( !data ) {
@@ -15,7 +15,7 @@ jQuery.extend({
 		}
 
 		if ( !q || jQuery.isArray(data) ) {
-			q = jQuery.data( elem, type, jQuery.makeArray(data) );
+			q = jQuery._data( elem, type, jQuery.makeArray(data) );
 
 		} else {
 			q.push( data );
@@ -46,6 +46,10 @@ jQuery.extend({
 				jQuery.dequeue(elem, type);
 			});
 		}
+
+		if ( !queue.length ) {
+			jQuery.removeData( elem, type + "queue", true );
+		}
 	}
 });
 
diff --git a/src/support.js b/src/support.js
index e4c3ea916..7be28fdaf 100644
--- a/src/support.js
+++ b/src/support.js
@@ -4,10 +4,7 @@
 
 	jQuery.support = {};
 
-	var root = document.documentElement,
-		script = document.createElement("script"),
-		div = document.createElement("div"),
-		id = "script" + jQuery.now();
+	var div = document.createElement("div");
 
 	div.style.display = "none";
 	div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
@@ -64,7 +61,7 @@
 		deleteExpando: true,
 		optDisabled: false,
 		checkClone: false,
-		scriptEval: false,
+		_scriptEval: null,
 		noCloneEvent: true,
 		boxModel: null,
 		inlineBlockNeedsLayout: false,
@@ -77,32 +74,46 @@
 	select.disabled = true;
 	jQuery.support.optDisabled = !opt.disabled;
 
-	script.type = "text/javascript";
-	try {
-		script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
-	} catch(e) {}
-
-	root.insertBefore( script, root.firstChild );
+	jQuery.support.scriptEval = function() {
+		if ( jQuery.support._scriptEval === null ) {
+			var root = document.documentElement,
+				script = document.createElement("script"),
+				id = "script" + jQuery.now();
+
+			script.type = "text/javascript";
+			try {
+				script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
+			} catch(e) {}
+
+			root.insertBefore( script, root.firstChild );
+
+			// Make sure that the execution of code works by injecting a script
+			// tag with appendChild/createTextNode
+			// (IE doesn't support this, fails, and uses .text instead)
+			if ( window[ id ] ) {
+				jQuery.support._scriptEval = true;
+				delete window[ id ];
+			} else {
+				jQuery.support._scriptEval = false;
+			}
+
+			root.removeChild( script );
+			// release memory in IE
+			root = script = id  = null;
+		}
 
-	// Make sure that the execution of code works by injecting a script
-	// tag with appendChild/createTextNode
-	// (IE doesn't support this, fails, and uses .text instead)
-	if ( window[ id ] ) {
-		jQuery.support.scriptEval = true;
-		delete window[ id ];
-	}
+		return jQuery.support._scriptEval;
+	};
 
 	// Test to see if it's possible to delete an expando from an element
 	// Fails in Internet Explorer
 	try {
-		delete script.test;
+		delete div.test;
 
 	} catch(e) {
 		jQuery.support.deleteExpando = false;
 	}
 
-	root.removeChild( script );
-
 	if ( div.attachEvent && div.fireEvent ) {
 		div.attachEvent("onclick", function click() {
 			// Cloning a node shouldn't copy over any
@@ -177,6 +188,14 @@
 		var el = document.createElement("div");
 		eventName = "on" + eventName;
 
+		// We only care about the case where non-standard event systems
+		// are used, namely in IE. Short-circuiting here helps us to
+		// avoid an eval call (in setAttribute) which can cause CSP
+		// to go haywire. See: https://developer.mozilla.org/en/Security/CSP
+		if ( !el.attachEvent ) {
+			return true;
+		}
+
 		var isSupported = (eventName in el);
 		if ( !isSupported ) {
 			el.setAttribute(eventName, "return;");
@@ -191,6 +210,6 @@
 	jQuery.support.changeBubbles = eventSupported("change");
 
 	// release memory in IE
-	root = script = div = all = a = null;
+	div = all = a = null;
 })();
 })( jQuery );
diff --git a/src/traversing.js b/src/traversing.js
index 689e90196..929547c11 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -6,7 +6,14 @@ var runtil = /Until$/,
 	rmultiselector = /,/,
 	isSimple = /^.[^:#\[\.,]*$/,
 	slice = Array.prototype.slice,
-	POS = jQuery.expr.match.POS;
+	POS = jQuery.expr.match.POS,
+	// methods guaranteed to produce a unique set when starting from a unique set
+	guaranteedUnique = {
+		children: true,
+		contents: true,
+		next: true,
+		prev: true
+	};
 
 jQuery.fn.extend({
 	find: function( selector ) {
@@ -196,7 +203,12 @@ jQuery.each({
 	}
 }, function( name, fn ) {
 	jQuery.fn[ name ] = function( until, selector ) {
-		var ret = jQuery.map( this, fn, until );
+		var ret = jQuery.map( this, fn, until ),
+                // The variable 'args' was introduced in
+                // https://github.com/jquery/jquery/commit/52a0238
+                // to work around a bug in Chrome 10 (Dev) and should be removed when the bug is fixed.
+                // http://code.google.com/p/v8/issues/detail?id=1050
+                    args = slice.call(arguments);
 
 		if ( !runtil.test( name ) ) {
 			selector = until;
@@ -206,13 +218,13 @@ jQuery.each({
 			ret = jQuery.filter( selector, ret );
 		}
 
-		ret = this.length > 1 ? jQuery.unique( ret ) : ret;
+		ret = this.length > 1 && !guaranteedUnique[ name ] ? jQuery.unique( ret ) : ret;
 
 		if ( (this.length > 1 || rmultiselector.test( selector )) && rparentsprev.test( name ) ) {
 			ret = ret.reverse();
 		}
 
-		return this.pushStack( ret, name, slice.call(arguments).join(",") );
+		return this.pushStack( ret, name, args.join(",") );
 	};
 });