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Result Size: 625 x 571
x
 
<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  width: 300px;
  height: 200px;
  border: 1px solid black;
  background-image: url('w3css.gif');
  background-size: 20px 20px;
  animation: mymove 5s infinite;
}
@keyframes mymove {
  50% {background-size: 125px 125px;}
}
</style>
</head>
<body>
<h1>Animation of background-size</h1>
<p>Gradually change the background-size from "10px 10px" to "125px 125px", and back:<p>
<div id="myDIV"></div>
<p><b>Note:</b> CSS Animations do not work in Internet Explorer 9 and earlier versions.</p>
</body>
<!-- Mirrored from www.w3schools.com/cssref/tryit.asp?filename=trycss_anim_background-size by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:35:50 GMT -->
</html>
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