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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
div {
opacity: 0;
height: 0;
background: red;
border-top: 1px solid #888;
transition-property: height, opacity;
transition-duration: 3000ms;
transition-timing-function: ease-in-out, ease-in-out, linear;
}
div[visible] {
opacity: 1;
height: 200px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>