IE detection.js

<script type="text/javascript">
    (function() {
        // IE detection
        var device = {};
        device.ie8 = /MSIE 8/i.test(navigator.userAgent);
        device.ie9 = /MSIE 9/i.test(navigator.userAgent);
        device.ie10 = /MSIE 10/i.test(navigator.userAgent);
        device.ie11 = /rv:11.0/i.test(navigator.userAgent);

        for(var i in device)
        {
            if(device[i]) {
                document.getElementsByTagName('html')[0].className += ' is-ie is-'+i;
                break;
            }
        }
    })();
</script>