<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>
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</html>