<div>W3TR</div>
div {
background: green;
width: 200px;
height: 20px;
-webkit-transition-property: height; /* Safari */
transition-property: height;
-webkit-transition-duration: 3s; /* Safari */
transition-duration: 3s;
}
div:hover {
height: 100px;
}
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This Pen doesn't use any external JavaScript resources.