Pass all tests (and load Sizzle fixture correctly) when loading with AMD

Conflicts:
	src/css.js

src/css.js

@@ -6,7 +6,9 @@ define([
 	"./css/defaultDisplay",
 	"./core/swap",
 	"./selector", // contains
-	"./support"
+	"./support",
+	// Optional
+	"./offset"
 ], function( jQuery, pnum, cssExpand, isHidden, defaultDisplay ) {
 
 var getStyles, curCSS,
@@ -563,7 +565,6 @@ jQuery(function() {
 	// Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084
 	// getComputedStyle returns percent when specified for top/left/bottom/right
 	// rather than make the css module depend on the offset module, we just check for it here
-	// TODO: Optional dependency on offset
 	if ( !jQuery.support.pixelPosition && jQuery.fn.position ) {
 		jQuery.each( [ "top", "left" ], function( i, prop ) {
 			jQuery.cssHooks[ prop ] = {