fix for #4204, fadeTo shows hidden elements before animating

1 files changed, 2 insertions, 1 deletions

diff --git a/src/fx.js b/src/fx.js
index c949bdc6a..45c2389cd 100644
--- a/src/fx.js
+++ b/src/fx.js
@@ -95,7 +95,8 @@ jQuery.fn.extend({
 	},
 
 	fadeTo: function(speed,to,callback){
-		return this.animate({opacity: to}, speed, callback);
+		return this.filter(":hidden").css('opacity', 0).show().end()
+					.animate({opacity: to}, speed, callback);
 	},
 
 	animate: function( prop, speed, easing, callback ) {