Make sure that selected works in Safari on options in optgroups. Fixes #5701.

src/attributes.js

@@ -261,12 +261,17 @@ jQuery.extend({
 		// Only do all the following if this is a node (faster for style)
 		if ( elem.nodeType === 1 ) {
 			// These attributes require special treatment
-			var special = rspecialurl.test( name );
+			var special = rspecialurl.test( name ), parent = elem.parentNode;
 
 			// Safari mis-reports the default selected property of a hidden option
 			// Accessing the parent's selectedIndex property fixes it
-			if ( name === "selected" && elem.parentNode ) {
-				elem.parentNode.selectedIndex;
+			if ( name === "selected" && parent ) {
+				parent.selectedIndex;
+
+				// Make sure that it also works with optgroups, see #5701
+				if ( parent.parentNode ) {
+					parent.parentNode.selectedIndex;
+				}
 			}
 
 			// If applicable, access the attribute via the DOM 0 way

test/unit/attributes.js

@@ -4,7 +4,7 @@ var bareObj = function(value) { return value; };
 var functionReturningObj = function(value) { return (function() { return value; }); };
 
 test("attr(String)", function() {
-	expect(27);
+	expect(28);
 
 	// This one sometimes fails randomly ?!
 	equals( jQuery('#text1').attr('value'), "Test", 'Check for value attribute' );
@@ -55,6 +55,12 @@ test("attr(String)", function() {
 	ok( $body.attr('foo') === undefined, 'Make sure the expando is preferred over the dom attribute, even if undefined' );
 
 	body.removeAttribute('foo'); // Cleanup
+
+	var select = document.createElement("select"), optgroup = document.createElement("optgroup"), option = document.createElement("option");
+	optgroup.appendChild( option );
+	select.appendChild( optgroup );
+
+	equals( jQuery(option).attr("selected"), true, "Make sure that a single option is selected, even when in an optgroup." );
 });
 
 if ( !isLocal ) {