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<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  width: 300px;
  height: 200px;
  outline: 1px solid black;
  animation: mymove 5s infinite;
}
​
@keyframes mymove {
  50% {outline: 15px solid lightblue;}
}
</style>
</head>
<body>
​
<h1>Animation of outline</h1>
​
<p>Gradually change the outline property:<p>
<div id="myDIV"></div>
​
<p>The outline property is a shorthand property for all outline properties.</p>
<p>See the individual outline properties to see which is <em>animatable</em>.</p>
<p><strong>Note:</strong> 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_outline by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:36:21 GMT -->
</html>
​
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