width, height, scrollLeft, and scrollTop now work with windows and do…

…cuments other than just the one it was loaded in (like iframes and popups)

src/dimensions.js

@@ -19,24 +19,26 @@ jQuery.each([ "Height", "Width" ], function(i, name){
 
 	jQuery.fn[ type ] = function( size ) {
 		// Get window width or height
-		return this[0] == window ?
+		var elem = this[0];
+		if ( !elem ) return null;
+		return ("scrollTo" in elem && elem.document) ? // does it walk and quack like a window?
 			// Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
-			document.compatMode == "CSS1Compat" && document.documentElement[ "client" + name ] ||
-			document.body[ "client" + name ] :
+			elem.document.compatMode === "CSS1Compat" && elem.document.documentElement[ "client" + name ] ||
+			elem.document.body[ "client" + name ] :
 
 			// Get document width or height
-			this[0] == document ?
+			(elem.nodeName === "#document") ? // is it a document
 				// Either scroll[Width/Height] or offset[Width/Height], whichever is greater
 				Math.max(
-					document.documentElement["client" + name],
-					document.body["scroll" + name], document.documentElement["scroll" + name],
-					document.body["offset" + name], document.documentElement["offset" + name]
+					elem.documentElement["client" + name],
+					elem.body["scroll" + name], elem.documentElement["scroll" + name],
+					elem.body["offset" + name], elem.documentElement["offset" + name]
 				) :
 
 				// Get or set width or height on the element
 				size === undefined ?
 					// Get width or height on the element
-					(this.length ? jQuery.css( this[0], type ) : null) :
+					jQuery.css( elem, type ) :
 
 					// Set the width or height on the element (default to pixels if value is unitless)
 					this.css( type, typeof size === "string" ? size : size + "px" );

src/offset.js

@@ -133,24 +133,32 @@ jQuery.each( ['Left', 'Top'], function(i, name) {
 
 	jQuery.fn[ method ] = function(val) {
 		if ( !this[0] ) return null;
+
+		var elem = this[0], win = ("scrollTo" in elem && elem.document) ? elem :
+			(elem.nodeName === "#document") ? elem.defaultView || elem.parentWindow :
+				false;
 
 		return val !== undefined ?
 
 			// Set the scroll offset
 			this.each(function() {
-				this == window || this == document ?
-					window.scrollTo(
-						!i ? val : jQuery(window).scrollLeft(),
-						 i ? val : jQuery(window).scrollTop()
+				win = ("scrollTo" in this && this.document) ? this : 
+					(this.nodeName === "#document") ? this.defaultView || this.parentWindow :
+						false;
+
+				win ?
+					win.scrollTo(
+						!i ? val : jQuery(win).scrollLeft(),
+						 i ? val : jQuery(win).scrollTop()
 					) :
 					this[ method ] = val;
 			}) :
 
 			// Return the scroll offset
-			this[0] == window || this[0] == document ?
-				self[ i ? 'pageYOffset' : 'pageXOffset' ] ||
-					jQuery.support.boxModel && document.documentElement[ method ] ||
-					document.body[ method ] :
-				this[0][ method ];
+			win ?
+				win[ i ? 'pageYOffset' : 'pageXOffset' ] ||
+					jQuery.support.boxModel && win.document.documentElement[ method ] ||
+					win.document.body[ method ] :
+				elem[ method ];
 	};
 });