jQuery Effect fadeTo() Method
Example
Gradually change the opacity of all <p> elements:
  
    $("button").click(function(){
     $("p").fadeTo(1000, 0.4);
 });
  
Try it Yourself »
Definition and Usage
The fadeTo() method gradually changes the opacity, for selected elements, to a specified opacity (fading effect).
Syntax
$(selector).fadeTo(speed,opacity,easing,callback)
| Parameter | Description | 
|---|---|
| speed | Required. Specifies the speed of the fading effect. Possible values: 
 | 
| opacity | Required. Specifies the opacity to fade to. Must be a number between 0.00 and 1.00 | 
| easing | Optional. Specifies the speed of the element in different points of the animation. Default value is "swing" Possible values: 
 | 
| callback | Optional. A function to be executed after the fadeTo() method is completed To learn more about callback, visit our jQuery Callback chapter | 
Try it Yourself - Examples
fadeTo() - Using the callback parameter
How to use the callback parameter when fading in and out an element.

