Live Demo: Example of CSS max-height Property Animation

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Example of CSS max-height Property Animation</title>
<style>
.animated {
	width: 150px;
	height: 500px;
	padding: 40px 0;
	font: bold 46px sans-serif;
	text-align: center;
    background: #aaccaa;	
    border: 1px solid #63a063;
    -webkit-animation: test 4s infinite; /* Chrome, Safari, Opera */
    animation: test 4s infinite;
}
/* Chrome, Safari, Opera */
@-webkit-keyframes test {
    50% {max-height: 60px;}
}
/* Standard syntax */
@keyframes test {
    50% {max-height: 60px;}
}
</style>
</head>
<body>
	<p><strong>Warning:</strong> CSS Animations do not work in Internet Explorer 9 and earlier versions. The max-height property doesn't animate smoothly like other animatable property.</p>
	<p><strong>Note:</strong> The max-height property of the following DIV box is animating from its initial value "none" to "60px", and back to the initial value "none" again up to infinite times. The max-height property overrides the height property of the element.<p>
	<div class="animated">Box</div>
</body>
</html>