<!DOCTYPE html>
<html>
<head>
<title>CSS :empty Selector</title>
<style type="text/css">
div:empty {
width:100px;
height:20px;
background:#ff0000;
}
</style>
</head>
<body>
<div></div>
<div>first paragraph.</div>
<div>Another one paragraph.</div>
</body>
</html>
