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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("#btn1").click(function(){
    $("#box").animate({opacity: "0.2"});
  });
  $("#btn2").click(function(){
    $("#box").animate({opacity: "1"});
  });
});
</script>
</head>
<body>
<button id="btn1">Animate opacity</button>
<button id="btn2">Reset opacity</button>
<div id="box" style="background:#98bf21;height:100px;width:100px;margin:6px;"></div>
</body>
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_eff_ani_opacity by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:43:26 GMT -->
</html>