CSS Animatable clip Property Example

<!DOCTYPE html>
<html>
<head>
<style> 
#container1, #container2 {
  	display: flex;
    color: #333;
  	justify-content: center;
    align-items: center;
    font-size: 20px;
    font-weight: bold;
	width: 120px;
	height: 100px;
    margin: auto;
    position: absolute; 
}
#container1 {
    background: #f00;
    animation: anim1 5s infinite;
    clip: rect(0,100px,100px,0);
}
#container2 {
    background: #00f;
    animation: anim2 5s infinite;
    margin-top: 20px;
    clip: rect(0,100px,100px,0);
    margin-top: 110px;
}

@keyframes anim1 {
	50% {clip: rect(0,50px,50px,0);}
}
@keyframes anim2 {
	50% {clip: rect(0,20px,40px,0);}
}
</style>
</head>
<body>

<h1>Animatable 'clip' Property</h1>
<hr>

<p>Experience the clip property behaviour.<p>
<div id="container1">Container 1</div>
<div id="container2">Container 2</div>

</body>
</html>