Scale: We can't detect this reliably currently, so assume all elements are positioned with left and top

Author: gnarf

tests/unit/effects/effects_scale.js

@@ -44,9 +44,11 @@ function suite( position ) {
 	run( position, "top", "left", "top", "left" );
 	run( position, "top", "left", "middle", "center" );
 	run( position, "top", "left", "bottom", "right" );
+	/* Firefox is currently not capable of supporting detection of bottom and right....
 	run( position, "bottom", "right", "top", "left" );
 	run( position, "bottom", "right", "middle", "center" );
 	run( position, "bottom", "right", "bottom", "right" );
+	*/
 }
 
 $(function() {

ui/jquery.effects.scale.js

@@ -117,9 +117,7 @@ $.effects.effect.size = function( o, done ) {
 		scale = o.scale || "both",
 		origin = o.origin || [ "middle", "center" ],
 		original, baseline, factor,
-		position = el.css( "position" ),
-		originalVerticalPositioning = el.css( "bottom" ) !== "auto" ? "bottom" : "top";
-		originalHorizontalPositioning = el.css( "right" ) !== "auto" ? "right" : "left";
+		position = el.css( "position" );
 
 	if ( mode === "show" ) {
 		el.show();
@@ -260,32 +258,19 @@ $.effects.effect.size = function( o, done ) {
 						left: el.to.left
 					});
 				} else {
-					$.each([ originalVerticalPositioning, originalHorizontalPositioning ], function( idx, pos ) {
+					$.each([ "top", "left" ], function( idx, pos ) {
 						el.css( pos, function( _, str ) {
 							var val = parseInt( str, 10 ),
 								toRef = idx ? el.to.left : el.to.top,
 								delta = idx ? el.to.outerWidth - el.from.outerWidth: el.to.outerHeight - el.from.outerHeight,
 								same = origin[ idx ] === pos,
-								mid = origin[ idx ] === "middle" || origin[ idx ] === "center",
-								direction = pos == "left" || pos == "top";
+								mid = origin[ idx ] === "middle" || origin[ idx ] === "center";
 
 							// if original was "auto", recalculate the new value from wrapper
 							if ( str === "auto" ) {
 								return toRef + "px";
 							}
 
-							// if not setting left or top
-							if ( !direction ) {
-
-								// if the position is relative, bottom/right are reversed meaning
-								if ( position === "relative" ) {
-									toRef *= -1;
-
-								// otherwise, if its NOT a midpoint origin, compensate for the outerWidth difference
-								} else if ( !mid ) {
-									toRef -= delta * ( same ? -1 : 1 );
-								}
-							}
 							return val + toRef + "px"; 
 						});
 					});