Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
    width: 500px;
    background-color: lightblue;
    overflow: auto;
    border: 1px solid black;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {min-height: 400px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {min-height: 400px;}
}
</style>
</head>
<body>

<p>Change the min-height, from "none" to "400px" and back to "none":<p>
<div id="myDIV">
  <p>This DIV element does not have a pre-defined height.</p>
  <p>An animation will change the min-height, from "none" to "400px".</p>
</div>

<p>The min-height 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>

</body>
</html>