Move window/document test to dimensions for consistency

src/css.js

@@ -170,11 +170,6 @@ jQuery.each(["height", "width"], function( i, name ) {
 		get: function( elem, computed, extra ) {
 			var val;
 
-			// Tests for window/document
-			if ( !elem.style ) {
-				return null;
-			}
-
 			if ( computed ) {
 				if ( elem.offsetWidth !== 0 ) {
 					val = getWH( elem, name, extra );

src/dimensions.js

@@ -7,17 +7,17 @@ jQuery.each([ "Height", "Width" ], function( i, name ) {
 
 	// innerHeight and innerWidth
 	jQuery.fn["inner" + name] = function() {
-		var ret;
-		return this[0] && !isNaN( ret = parseFloat(jQuery.css( this[0], type, "padding" )) ) ?
-			ret :
+		var elem = this[0];
+		return elem && elem.style ?
+			parseFloat( jQuery.css( elem, type, "padding" ) ) :
 			null;
 	};
 
 	// outerHeight and outerWidth
 	jQuery.fn["outer" + name] = function( margin ) {
-		var ret;
-		return this[0] && !isNaN( ret = parseFloat(jQuery.css( this[0], type, margin ? "margin" : "border" )) ) ?
-			ret :
+		var elem = this[0];
+		return elem && elem.style ?
+			parseFloat( jQuery.css( elem, type, margin ? "margin" : "border" ) ) :
 			null;
 	};