Fix #5571. Setters should treat undefined as a no-op and be chainable.

src/attributes.js

@@ -12,7 +12,7 @@ var rclass = /[\n\t\r]/g,
 
 jQuery.fn.extend({
 	attr: function( name, value ) {
-		return jQuery.access( this, name, value, true, jQuery.attr );
+		return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 );
 	},
 
 	removeAttr: function( name ) {
@@ -22,7 +22,7 @@ jQuery.fn.extend({
 	},
 
 	prop: function( name, value ) {
-		return jQuery.access( this, name, value, true, jQuery.prop );
+		return jQuery.access( this, jQuery.prop, name, value, arguments.length > 1 );
 	},
 
 	removeProp: function( name ) {

src/core.js

@@ -801,31 +801,55 @@ jQuery.extend({
 
 	// Mutifunctional method to get and set values to a collection
 	// The value/s can optionally be executed if it's a function
-	access: function( elems, key, value, exec, fn, pass ) {
-		var length = elems.length;
+	access: function( elems, fn, key, value, chainable, emptyGet, pass ) {
+		var exec,
+			bulk = key == null,
+			i = 0,
+			length = elems.length;
 
-		// Setting many attributes
-		if ( typeof key === "object" ) {
-			for ( var k in key ) {
-				jQuery.access( elems, k, key[k], exec, fn, value );
-			}
-			return elems;
+		// Sets many values
+		if ( key && typeof key === "object" ) {
+			for ( i in key ) {
+				jQuery.access( elems, fn, i, key[i], 1, emptyGet, value );
 			}
+			chainable = 1;
 
-		// Setting one attribute
-		if ( value !== undefined ) {
+		// Sets one value
+		} else if ( value !== undefined ) {
 			// Optionally, function values get executed if exec is true
-			exec = !pass && exec && jQuery.isFunction(value);
+			exec = pass === undefined && jQuery.isFunction( value );
 
-			for ( var i = 0; i < length; i++ ) {
+			if ( bulk ) {
+				// Bulk operations only iterate when executing function values
+				if ( exec ) {
+					exec = fn;
+					fn = function( elem, key, value ) {
+						return exec.call( jQuery( elem ), value );
+					};
+
+				// Otherwise they run against the entire set
+				} else {
+					fn.call( elems, value );
+					fn = null;
+				}
+			}
+
+			if ( fn ) {
+				for (; i < length; i++ ) {
 					fn( elems[i], key, exec ? value.call( elems[i], i, fn( elems[i], key ) ) : value, pass );
 				}
-
-			return elems;
 			}
 
-		// Getting an attribute
-		return length ? fn( elems[0], key ) : undefined;
+			chainable = 1;
+		}
+
+		return chainable ?
+			elems :
+
+			// Gets
+			bulk ?
+				fn.call( elems ) :
+				length ? fn( elems[0], key ) : emptyGet;
 	},
 
 	now: function() {

src/css.js

@@ -17,16 +17,11 @@ var ralpha = /alpha\([^)]*\)/i,
 	currentStyle;
 
 jQuery.fn.css = function( name, value ) {
-	// Setting 'undefined' is a no-op
-	if ( arguments.length === 2 && value === undefined ) {
-		return this;
-	}
-
-	return jQuery.access( this, name, value, true, function( elem, name, value ) {
+	return jQuery.access( this, function( elem, name, value ) {
 		return value !== undefined ?
 			jQuery.style( elem, name, value ) :
 			jQuery.css( elem, name );
-	});
+	}, name, value, arguments.length > 1 );
 };
 
 jQuery.extend({

src/data.js

@@ -246,62 +246,69 @@ jQuery.extend({
 
 jQuery.fn.extend({
 	data: function( key, value ) {
-		var parts, attr, name,
+		var parts, part, attr, name, l,
+			elem = this[0],
+			i = 0,
 			data = null;
 
-		if ( typeof key === "undefined" ) {
+		// Gets all values
+		if ( key === undefined ) {
 			if ( this.length ) {
-				data = jQuery.data( this[0] );
+				data = jQuery.data( elem );
 
-				if ( this[0].nodeType === 1 && !jQuery._data( this[0], "parsedAttrs" ) ) {
-					attr = this[0].attributes;
-					for ( var i = 0, l = attr.length; i < l; i++ ) {
+				if ( elem.nodeType === 1 && !jQuery._data( elem, "parsedAttrs" ) ) {
+					attr = elem.attributes;
+					for ( l = attr.length; i < l; i++ ) {
 						name = attr[i].name;
 
 						if ( name.indexOf( "data-" ) === 0 ) {
 							name = jQuery.camelCase( name.substring(5) );
 
-							dataAttr( this[0], name, data[ name ] );
+							dataAttr( elem, name, data[ name ] );
 						}
 					}
-					jQuery._data( this[0], "parsedAttrs", true );
+					jQuery._data( elem, "parsedAttrs", true );
 				}
 			}
 
 			return data;
+		}
 
-		} else if ( typeof key === "object" ) {
+		// Sets multiple values
+		if ( typeof key === "object" ) {
 			return this.each(function() {
 				jQuery.data( this, key );
 			});
 		}
 
-		parts = key.split(".");
+		return jQuery.access( this, function( value ) {
+			parts = key.split( ".", 2 ),
 			parts[1] = parts[1] ? "." + parts[1] : "";
+			part = parts[1] + "!";
 
 			if ( value === undefined ) {
-			data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
+				data = this.triggerHandler( "getData" + part, [ parts[0] ] );
 
 				// Try to fetch any internally stored data first
-			if ( data === undefined && this.length ) {
-				data = jQuery.data( this[0], key );
-				data = dataAttr( this[0], key, data );
+				if ( data === undefined && elem ) {
+					data = jQuery.data( elem, key );
+					data = dataAttr( elem, key, data );
 				}
 
 				return data === undefined && parts[1] ?
 					this.data( parts[0] ) :
 					data;
-
-		} else {
-			return this.each(function() {
-				var self = jQuery( this ),
-					args = [ parts[0], value ];
-
-				self.triggerHandler( "setData" + parts[1] + "!", args );
-				jQuery.data( this, key, value );
-				self.triggerHandler( "changeData" + parts[1] + "!", args );
-			});
 			}
+
+			parts[1] = value;
+			this.each(function() {
+				var self = jQuery( this );
+
+				self.triggerHandler( "setData" + part, parts );
+				jQuery.data( this, key, value );
+				self.triggerHandler( "changeData" + part, parts );
+			});
+		}, null, value, arguments.length > 1, null, false );
 	},
 
 	removeData: function( key ) {

src/dimensions.js

@@ -1,9 +1,10 @@
 (function( jQuery ) {
 
 // Create width, height, innerHeight, innerWidth, outerHeight and outerWidth methods
-jQuery.each([ "Height", "Width" ], function( i, name ) {
-
-	var type = name.toLowerCase();
+jQuery.each( { Height: "height", Width: "width" }, function( name, type ) {
+	var clientProp = "client" + name,
+		scrollProp = "scroll" + name,
+		offsetProp = "offset" + name;
 
 	// innerHeight and innerWidth
 	jQuery.fn[ "inner" + name ] = function() {
@@ -25,50 +26,40 @@ jQuery.each([ "Height", "Width" ], function( i, name ) {
 			null;
 	};
 
-	jQuery.fn[ type ] = function( size ) {
-		// Get window width or height
-		var elem = this[0];
-		if ( !elem ) {
-			return size == null ? null : this;
-		}
-
-		if ( jQuery.isFunction( size ) ) {
-			return this.each(function( i ) {
-				var self = jQuery( this );
-				self[ type ]( size.call( this, i, self[ type ]() ) );
-			});
-		}
+	jQuery.fn[ type ] = function( value ) {
+		return jQuery.access( this, function( elem, type, value ) {
+			var doc, docElemProp, orig, ret;
 
 			if ( jQuery.isWindow( elem ) ) {
-			// Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
 				// 3rd condition allows Nokia support, as it supports the docElem prop but not CSS1Compat
-			var docElemProp = elem.document.documentElement[ "client" + name ],
-				body = elem.document.body;
-			return elem.document.compatMode === "CSS1Compat" && docElemProp ||
-				body && body[ "client" + name ] || docElemProp;
+				doc = elem.document;
+				docElemProp = doc.documentElement[ clientProp ];
+				return doc.compatMode === "CSS1Compat" && docElemProp ||
+					doc.body && doc.body[ clientProp ] || docElemProp;
+			}
 
 			// Get document width or height
-		} else if ( elem.nodeType === 9 ) {
+			if ( elem.nodeType === 9 ) {
 				// Either scroll[Width/Height] or offset[Width/Height], whichever is greater
+				doc = elem.documentElement;
 				return Math.max(
-				elem.documentElement["client" + name],
-				elem.body["scroll" + name], elem.documentElement["scroll" + name],
-				elem.body["offset" + name], elem.documentElement["offset" + name]
+					doc[ clientProp ],
+					elem.body[ scrollProp ], doc[ scrollProp ],
+					elem.body[ offsetProp ], doc[ offsetProp ]
 				);
-
-		// Get or set width or height on the element
-		} else if ( size === undefined ) {
-			var orig = jQuery.css( elem, type ),
-				ret = parseFloat( orig );
-
-			return jQuery.isNumeric( ret ) ? ret : orig;
-
-		// Set the width or height on the element (default to pixels if value is unitless)
-		} else {
-			return this.css( type, typeof size === "string" ? size : size + "px" );
 			}
-	};
 
+			// Get width or height on the element
+			if ( value === undefined ) {
+				orig = jQuery.css( elem, type );
+				ret = parseFloat( orig );
+				return jQuery.isNumeric( ret ) ? ret : orig;
+			}
+
+			// Set the width or height on the element
+			jQuery( elem ).css( type, value );
+		}, type, value, arguments.length, null );
+	};
 });
 
 })( jQuery );

src/manipulation.js

@@ -51,20 +51,12 @@ if ( !jQuery.support.htmlSerialize ) {
 }
 
 jQuery.fn.extend({
-	text: function( text ) {
-		if ( jQuery.isFunction(text) ) {
-			return this.each(function(i) {
-				var self = jQuery( this );
-
-				self.text( text.call(this, i, self.text()) );
-			});
-		}
-
-		if ( typeof text !== "object" && text !== undefined ) {
-			return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
-		}
-
-		return jQuery.text( this );
+	text: function( value ) {
+		return jQuery.access( this, function( value ) {
+			return value === undefined ?
+				jQuery.text( this ) :
+				this.empty().append( ( this[0] && this[0].ownerDocument || document ).createTextNode( value ) );
+		}, null, value, arguments.length );
 	},
 
 	wrapAll: function( html ) {
@@ -216,44 +208,44 @@ jQuery.fn.extend({
 	},
 
 	html: function( value ) {
+		return jQuery.access( this, function( value ) {
+			var elem = this[0] || {},
+				i = 0,
+				l = this.length;
+
 			if ( value === undefined ) {
-			return this[0] && this[0].nodeType === 1 ?
-				this[0].innerHTML.replace(rinlinejQuery, "") :
+				return elem.nodeType === 1 ?
+					elem.innerHTML.replace( rinlinejQuery, "" ) :
 					null;
+			}
 
-		// See if we can take a shortcut and just use innerHTML
-		} else if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
-			(jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value )) &&
-			!wrapMap[ (rtagName.exec( value ) || ["", ""])[1].toLowerCase() ] ) {
 
-			value = value.replace(rxhtmlTag, "<$1></$2>");
+			if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
+				( jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value ) ) &&
+				!wrapMap[ ( rtagName.exec( value ) || ["", ""] )[1].toLowerCase() ] ) {
+
+				value = value.replace( rxhtmlTag, "<$1></$2>" );
 
 				try {
-				for ( var i = 0, l = this.length; i < l; i++ ) {
+					for (; i < l; i++ ) {
 						// Remove element nodes and prevent memory leaks
-					if ( this[i].nodeType === 1 ) {
-						jQuery.cleanData( this[i].getElementsByTagName("*") );
-						this[i].innerHTML = value;
+						elem = this[i] || {};
+						if ( elem.nodeType === 1 ) {
+							jQuery.cleanData( elem.getElementsByTagName( "*" ) );
+							elem.innerHTML = value;
 						}
 					}
 
+					elem = 0;
+
 				// If using innerHTML throws an exception, use the fallback method
-			} catch(e) {
-				this.empty().append( value );
+				} catch(e) {}
 			}
 
-		} else if ( jQuery.isFunction( value ) ) {
-			this.each(function(i){
-				var self = jQuery( this );
-
-				self.html( value.call(this, i, self.html()) );
-			});
-
-		} else {
+			if ( elem ) {
 				this.empty().append( value );
 			}
-
-		return this;
+		}, null, value, arguments.length );
 	},
 
 	replaceWith: function( value ) {

src/offset.js

@@ -1,40 +1,22 @@
 (function( jQuery ) {
 
-var rtable = /^t(?:able|d|h)$/i,
+var getOffset,
+	rtable = /^t(?:able|d|h)$/i,
 	rroot = /^(?:body|html)$/i;
 
 if ( "getBoundingClientRect" in document.documentElement ) {
-	jQuery.fn.offset = function( options ) {
-		var elem = this[0], box;
-
-		if ( options ) {
-			return this.each(function( i ) {
-				jQuery.offset.setOffset( this, options, i );
-			});
-		}
-
-		if ( !elem || !elem.ownerDocument ) {
-			return null;
-		}
-
-		if ( elem === elem.ownerDocument.body ) {
-			return jQuery.offset.bodyOffset( elem );
-		}
-
+	getOffset = function( elem, doc, docElem, box ) {
 		try {
 			box = elem.getBoundingClientRect();
 		} catch(e) {}
 
-		var doc = elem.ownerDocument,
-			docElem = doc.documentElement;
-
 		// Make sure we're not dealing with a disconnected DOM node
 		if ( !box || !jQuery.contains( docElem, elem ) ) {
 			return box ? { top: box.top, left: box.left } : { top: 0, left: 0 };
 		}
 
 		var body = doc.body,
-			win = getWindow(doc),
+			win = getWindow( doc ),
 			clientTop  = docElem.clientTop  || body.clientTop  || 0,
 			clientLeft = docElem.clientLeft || body.clientLeft || 0,
 			scrollTop  = win.pageYOffset || jQuery.support.boxModel && docElem.scrollTop  || body.scrollTop,
@@ -46,28 +28,10 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 	};
 
 } else {
-	jQuery.fn.offset = function( options ) {
-		var elem = this[0];
-
-		if ( options ) {
-			return this.each(function( i ) {
-				jQuery.offset.setOffset( this, options, i );
-			});
-		}
-
-		if ( !elem || !elem.ownerDocument ) {
-			return null;
-		}
-
-		if ( elem === elem.ownerDocument.body ) {
-			return jQuery.offset.bodyOffset( elem );
-		}
-
+	getOffset = function( elem, doc, docElem ) {
 		var computedStyle,
 			offsetParent = elem.offsetParent,
 			prevOffsetParent = elem,
-			doc = elem.ownerDocument,
-			docElem = doc.documentElement,
 			body = doc.body,
 			defaultView = doc.defaultView,
 			prevComputedStyle = defaultView ? defaultView.getComputedStyle( elem, null ) : elem.currentStyle,
@@ -118,6 +82,29 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 	};
 }
 
+jQuery.fn.offset = function( options ) {
+	if ( arguments.length ) {
+		return options === undefined ?
+			this :
+			this.each(function( i ) {
+				jQuery.offset.setOffset( this, options, i );
+			});
+	}
+
+	var elem = this[0],
+		doc = elem && elem.ownerDocument;
+
+	if ( !doc ) {
+		return null;
+	}
+
+	if ( elem === doc.body ) {
+		return jQuery.offset.bodyOffset( elem );
+	}
+
+	return getOffset( elem, doc, doc.documentElement );
+};
+
 jQuery.offset = {
 
 	bodyOffset: function( body ) {
@@ -223,42 +210,30 @@ jQuery.fn.extend({
 
 
 // Create scrollLeft and scrollTop methods
-jQuery.each( ["Left", "Top"], function( i, name ) {
-	var method = "scroll" + name;
+jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
+	var top = /Y/.test( prop );
 
 	jQuery.fn[ method ] = function( val ) {
-		var elem, win;
+		return jQuery.access( this, function( elem, method, val ) {
+			var win = getWindow( elem );
 
 			if ( val === undefined ) {
-			elem = this[ 0 ];
-
-			if ( !elem ) {
-				return null;
-			}
-
-			win = getWindow( elem );
-
-			// Return the scroll offset
-			return win ? ("pageXOffset" in win) ? win[ i ? "pageYOffset" : "pageXOffset" ] :
+				return win ? (prop in win) ? win[ prop ] :
 					jQuery.support.boxModel && win.document.documentElement[ method ] ||
 						win.document.body[ method ] :
 					elem[ method ];
 			}
 
-		// Set the scroll offset
-		return this.each(function() {
-			win = getWindow( this );
-
 			if ( win ) {
 				win.scrollTo(
-					!i ? val : jQuery( win ).scrollLeft(),
-					 i ? val : jQuery( win ).scrollTop()
+					!top ? val : jQuery( win ).scrollLeft(),
+					 top ? val : jQuery( win ).scrollTop()
 				);
 
 			} else {
-				this[ method ] = val;
+				elem[ method ] = val;
 			}
-		});
+		}, method, val, arguments.length, null );
 	};
 });
 

src/queue.js

@@ -100,15 +100,21 @@ jQuery.extend({
 
 jQuery.fn.extend({
 	queue: function( type, data ) {
+		var setter = 2;
+
 		if ( typeof type !== "string" ) {
 			data = type;
 			type = "fx";
+			setter--;
 		}
 
-		if ( data === undefined ) {
+		if ( arguments.length < setter ) {
 			return jQuery.queue( this[0], type );
 		}
-		return this.each(function() {
+
+		return data === undefined ?
+			this :
+			this.each(function() {
 				var queue = jQuery.queue( this, type, data );
 
 				if ( type === "fx" && queue[0] !== "inprogress" ) {

test/unit/attributes.js

@@ -158,7 +158,7 @@ test("attr(Hash)", function() {
 });
 
 test("attr(String, Object)", function() {
-	expect(78);
+	expect(81);
 
 	var div = jQuery("div").attr("foo", "bar"),
 		fail = false;
@@ -353,6 +353,12 @@ test("attr(String, Object)", function() {
 	+ "</svg>").appendTo("body");
 	equal( $svg.attr("cx", 100).attr("cx"), "100", "Set attribute on svg element" );
 	$svg.remove();
+
+	// undefined values are chainable
+	jQuery("#name").attr("maxlength", "5").removeAttr("nonexisting");
+	equal( typeof jQuery("#name").attr("maxlength", undefined), "object", ".attr('attribute', undefined) is chainable (#5571)" );
+	equal( jQuery("#name").attr("maxlength", undefined).attr("maxlength"), "5", ".attr('attribute', undefined) does not change value (#5571)" );
+	equal( jQuery("#name").attr("nonexisting", undefined).attr("nonexisting"), undefined, ".attr('attribute', undefined) does not create attribute (#5571)" );
 });
 
 test("attr(jquery_method)", function(){

test/unit/data.js

@@ -222,8 +222,7 @@ test(".data(String) and .data(String, Object)", function() {
 	div.data("test", "overwritten");
 	equal( div.data("test"), "overwritten", "Check for overwritten data" );
 
-	div.data("test", undefined);
-	equal( div.data("test"), "overwritten", "Check that data wasn't removed");
+	equal( div.data("test", undefined).data("test"), "overwritten", "Check that .data('key',undefined) does nothing but is chainable (#5571)");
 
 	div.data("test", null);
 	ok( div.data("test") === null, "Check for null data");

test/unit/dimensions.js

@@ -41,11 +41,16 @@ test("width()", function() {
 	testWidth( pass );
 });
 
-test("width() with function", function() {
+test("width(undefined)", function() {
+	expect(1);
+	equal(jQuery("#nothiddendiv").width(30).width(undefined).width(), 30, ".width(undefined) is chainable (#5571)");
+});
+
+test("width(Function)", function() {
 	testWidth( fn );
 });
 
-test("width() with function args", function() {
+test("width(Function(args))", function() {
 	expect( 2 );
 
 	var $div = jQuery("#nothiddendiv");
@@ -90,11 +95,16 @@ test("height()", function() {
 	testHeight( pass );
 });
 
-test("height() with function", function() {
+test("height(undefined)", function() {
+	expect(1);
+	equal(jQuery("#nothiddendiv").height(30).height(undefined).height(), 30, ".height(undefined) is chainable (#5571)");
+});
+
+test("height(Function)", function() {
 	testHeight( fn );
 });
 
-test("height() with function args", function() {
+test("height(Function(args))", function() {
 	expect( 2 );
 
 	var $div = jQuery("#nothiddendiv");

test/unit/manipulation.js

@@ -16,6 +16,11 @@ test("text()", function() {
 	notEqual( jQuery(document).text(), "", "Retrieving text for the document retrieves all text (#10724).");
 });
 
+test("text(undefined)", function() {
+	expect(1);
+	equal( jQuery("#foo").text("<div").text(undefined)[0].innerHTML, "&lt;div", ".text(undefined) is chainable (#5571)" );
+});
+
 var testText = function(valueObj) {
 	expect(4);
 	var val = valueObj("<div><b>Hello</b> cruel world!</div>");
@@ -1207,6 +1212,11 @@ test("clone() on XML nodes", function() {
 });
 }
 
+test("html(undefined)", function() {
+	expect(1);
+	equal( jQuery("#foo").html("<i>test</i>").html(undefined).html().toLowerCase(), "<i>test</i>", ".html(undefined) is chainable (#5571)" );
+});
+
 var testHtml = function(valueObj) {
 	expect(34);
 

test/unit/offset.js

@@ -342,7 +342,7 @@ testoffset("table", function( jQuery ) {
 });
 
 testoffset("scroll", function( jQuery, win ) {
-	expect(22);
+	expect(24);
 
 	var ie = jQuery.browser.msie && parseInt( jQuery.browser.version, 10 ) < 8;
 
@@ -362,8 +362,9 @@ testoffset("scroll", function( jQuery, win ) {
 	equal( jQuery("#scroll-1-1").scrollTop(), 0, "jQuery('#scroll-1-1').scrollTop()" );
 	equal( jQuery("#scroll-1-1").scrollLeft(), 0, "jQuery('#scroll-1-1').scrollLeft()" );
 
-	// equal( jQuery("body").scrollTop(), 0, "jQuery("body").scrollTop()" );
-	// equal( jQuery("body").scrollLeft(), 0, "jQuery("body").scrollTop()" );
+	// scroll method chaining
+	equal( jQuery("#scroll-1").scrollTop(undefined).scrollTop(), 5, ".scrollTop(undefined) is chainable (#5571)" );
+	equal( jQuery("#scroll-1").scrollLeft(undefined).scrollLeft(), 5, ".scrollLeft(undefined) is chainable (#5571)" );
 
 	win.name = "test";
 
@@ -405,11 +406,12 @@ testoffset("body", function( jQuery ) {
 	equal( jQuery("body").offset().left, 1, "jQuery('#body').offset().left" );
 });
 
-test("Chaining offset(coords) returns jQuery object", function() {
-	expect(2);
+test("chaining", function() {
+	expect(3);
 	var coords = { top:  1, left:  1 };
 	equal( jQuery("#absolute-1").offset(coords).selector, "#absolute-1", "offset(coords) returns jQuery object" );
 	equal( jQuery("#non-existent").offset(coords).selector, "#non-existent", "offset(coords) with empty jQuery set returns jQuery object" );
+	equal( jQuery("#absolute-1").offset(undefined).selector, "#absolute-1", "offset(undefined) returns jQuery object (#5571)" );
 });
 
 test("offsetParent", function(){

test/unit/queue.js

@@ -1,7 +1,7 @@
 module("queue", { teardown: moduleTeardown });
 
 test("queue() with other types",function() {
-	expect(11);
+	expect(12);
 	var counter = 0;
 
 	stop();
@@ -36,6 +36,8 @@ test("queue() with other types",function() {
 
 	equal( $div.queue("foo").length, 4, "Testing queue length" );
 
+	equal( $div.queue("foo", undefined).queue("foo").length, 4, ".queue('name',undefined) does nothing but is chainable (#5571)");
+
 	$div.dequeue("foo");
 
 	equal( counter, 3, "Testing previous call to dequeue" );