Ensure that buildFragment clones elements properly in all browsers. Fixes #3879, #6655. Also improves form element clone tests and fixes bugs in $.fn.clone exposed by these new test cases related to the values of checkboxes and radio buttons in IE.

src/core.js

@@ -129,7 +129,7 @@ jQuery.fn = jQuery.prototype = {
 
 					} else {
 						ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
-						selector = (ret.cacheable ? ret.fragment.cloneNode(true) : ret.fragment).childNodes;
+						selector = (ret.cacheable ? jQuery(ret.fragment).clone()[0] : ret.fragment).childNodes;
 					}
 
 					return jQuery.merge( this, selector );

src/manipulation.js

@@ -420,15 +420,29 @@ function cloneFixAttributes(src, dest) {
 	if ( nodeName === "object" ) {
 		dest.outerHTML = src.outerHTML;
 
+	} else if ( nodeName === "input" && (src.type === "checkbox" || src.type === "radio") ) {
 		// IE6-8 fails to persist the checked state of a cloned checkbox
-	// or radio button
+		// or radio button. Worse, IE6-7 fail to give the cloned element
-	} else if ( nodeName === "input" && src.checked ) {
+		// a checked appearance if the defaultChecked value isn't also set
+		if ( src.checked ) {
 			dest.defaultChecked = dest.checked = src.checked;
+		}
+
+		// IE6-7 get confused and end up setting the value of a cloned
+		// checkbox/radio button to an empty string instead of "on"
+		if ( dest.value !== src.value ) {
+			dest.value = src.value;
+		}
 
 	// IE6-8 fails to return the selected option to the default selected
 	// state when cloning options
 	} else if ( nodeName === "option" ) {
 		dest.selected = src.defaultSelected;
+
+	// IE6-8 fails to set the defaultValue to the correct value when
+	// cloning other types of input fields
+	} else if ( nodeName === "input" || nodeName === "textarea" ) {
+		dest.defaultValue = src.defaultValue;
 	}
 
 	// Event data gets referenced instead of copied if the expando

test/unit/core.js

@@ -12,7 +12,7 @@ test("Basic requirements", function() {
 });
 
 test("jQuery()", function() {
-	expect(23);
+	expect(24);
 
 	// Basic constructor's behavior
 
@@ -84,6 +84,11 @@ test("jQuery()", function() {
 
 	exec = true;
 	elem.click();
+
+	for ( var i = 0; i < 3; ++i ) {
+		elem = jQuery("<input type='text' value='TEST' />");
+	}
+	equals( elem[0].defaultValue, "TEST", "Ensure cached nodes are cloned properly (Bug #6655)" );
 });
 
 test("selector state", function() {

test/unit/manipulation.js

@@ -395,7 +395,7 @@ test("append(Function) with incoming value", function() {
 });
 
 test("append the same fragment with events (Bug #6997, 5566)", function () {
-	expect(4 + (document.fireEvent ? 1 : 0));
+	expect(2 + (document.fireEvent ? 1 : 0));
 	stop(1000);
 
 	var element;
@@ -426,14 +426,6 @@ test("append the same fragment with events (Bug #6997, 5566)", function () {
 
 	jQuery("#listWithTabIndex li").before(element);
 	jQuery("#listWithTabIndex li.test6997").eq(1).click();
-
-	element = jQuery("<select><option>Foo</option><option selected>Bar</option></select>");
-
-	equals( element.clone().find("option:selected").val(), element.find("option:selected").val(), "Selected option cloned correctly" );
-
-	element = jQuery("<input type='checkbox'>").attr('checked', 'checked');
-
-	equals( element.clone().is(":checked"), element.is(":checked"), "Checked input cloned correctly" );
 });
 
 test("appendTo(String|Element|Array&lt;Element&gt;|jQuery)", function() {
@@ -945,6 +937,28 @@ test("clone()", function() {
 	equal( jQuery("body").clone().children()[0].id, "qunit-header", "Make sure cloning body works" );
 });
 
+test("clone(form element) (Bug #3879, #6655)", function() {
+	expect(6);
+	element = jQuery("<select><option>Foo</option><option selected>Bar</option></select>");
+
+	equals( element.clone().find("option:selected").val(), element.find("option:selected").val(), "Selected option cloned correctly" );
+
+	element = jQuery("<input type='checkbox' value='foo'>").attr('checked', 'checked');
+	clone = element.clone();
+
+	equals( clone.is(":checked"), element.is(":checked"), "Checked input cloned correctly" );
+	equals( clone[0].defaultValue, "foo", "Checked input defaultValue cloned correctly" );
+	equals( clone[0].defaultChecked, !jQuery.support.noCloneEvent, "Checked input defaultChecked cloned correctly" );
+
+	element = jQuery("<input type='text' value='foo'>");
+	clone = element.clone();
+	equals( clone[0].defaultValue, "foo", "Text input defaultValue cloned correctly" );
+
+	element = jQuery("<textarea>foo</textarea>");
+	clone = element.clone();
+	equals( clone[0].defaultValue, "foo", "Textarea defaultValue cloned correctly" );
+});
+
 if (!isLocal) {
 test("clone() on XML nodes", function() {
 	expect(2);