<!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>
<p>Click on the following button to find the name(title) of last enabled stylesheet of this document.</p>
<button onclick="myFunction()">Click Me</button>
<p id="point"></p>
<script>
var x = document.getElementById("point");
//try to change "green" to "red
document.selectedStyleSheetSet = "green";
function myFunction(){
x.innerHTML = document.lastStyleSheetSet;
}
</script> </body>
</html>