<!DOCTYPE html>
<html lang="en-US">
<head>
<link rel="stylesheet" title="red" type="text/css" href="/red.css">
<link rel="stylesheet" title="green" type="text/css" href="/green.css">
</head>
<body>
<p>This example will work only on Firefox</p>
<script>
// try to change "red" to "green"
document.enableStyleSheetsForSet("red");
</script>
<p>The css file used in the example: <a target="_blank" href="/red.css">red.css</a>, <a target="_blank" href="/green.css">green.css</a></p> </body>
</html>