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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 250px;
  height: 100px;
  border: 1px solid #c3c3c3;
  display: flex;
}
​
#main div {
  flex-grow: 0;
  flex-shrink: 0;
  flex-basis: 50px;
}
​
#myBlueDiv {
  animation: mymove 5s infinite;
}
​
@keyframes mymove {
  50% {flex-basis: 200px;}
}
</style>
</head>
<body>
​
<h1>Animation of flex-basis</h1>
​
<p>Gradually change the flex-basis property of the BLUE div from 50px to 200px, and back:<p>
​
<div id="main">
  <div style="background-color:coral;">RED</div>
  <div style="background-color:lightblue;" id="myBlueDiv">BLUE</div>
</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_flex-basis by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:35:51 GMT -->
</html>
​
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