Fixed getting styles from disconnected nodes. Fixes #7148.

src/css.js

@@ -230,6 +230,9 @@ if ( getComputedStyle ) {
 
 		if ( (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
 			ret = computedStyle.getPropertyValue( name );
+			if ( ret === "" && !jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
+				ret = jQuery.style( elem, name );
+			}
 		}
 
 		return ret;

test/unit/css.js

@@ -1,7 +1,7 @@
 module("css");
 
 test("css(String|Hash)", function() {
-	expect(33);
+	expect(34);
 
 	equals( jQuery('#main').css("display"), 'block', 'Check for css property "display"');
 
@@ -19,6 +19,8 @@ test("css(String|Hash)", function() {
 	equals( parseFloat(jQuery('#nothiddendiv').css('width')), width, 'Test negative width ignored')
 	equals( parseFloat(jQuery('#nothiddendiv').css('height')), height, 'Test negative height ignored')
 
+	equals( jQuery('<div style="display: none;">').css('display'), 'none', 'Styles on disconnected nodes');
+
 	jQuery('#floatTest').css({'float': 'right'});
 	equals( jQuery('#floatTest').css('float'), 'right', 'Modified CSS float using "float": Assert float is right');
 	jQuery('#floatTest').css({'font-size': '30px'});