<html>
<head>
<style>
  #clip {position:absolute; background-color: green; top:50px; left:50px; width:100px; height:500px; clip:rect(auto auto 100px auto)}
</style>
</head>
<body>
You should see a 100x100 green square below.
<div id="clip"></div>
</body>
</html>