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<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  position: absolute;
  top: 200px;
  width: 300px;
  height: 150px;
  background-color: lightblue;
  border: 1px solid black;
  animation: mymove 5s infinite;
}
​
#DIV2 {
  position: absolute;
  top: 180px;
  left: 30px;
  width: 300px;
  height: 150px;
  background-color: coral;
  border: 1px solid black;
}
​
@keyframes mymove {
  50% {opacity: 0;}
}
</style>
</head>
<body>
​
<h1>Animation of opacity</h1>
​
<p>The opacity property is <em>animatable</em> in CSS.</p>
<p><b>Note:</b> CSS Animations do not work in Internet Explorer 9 and earlier versions.</p>
​
<p>Change the opacity of the blue DIV element from 1 to 0, and back to 1:<p>
​
<div id="DIV2">
  <h1>Voila!</h1>
</div>
​
<div id="myDIV">
</div>
​
</body>
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