Alexander Pushkarev

http://www.example.com/?cat=42&feed=rss2
или
http://www.example.com/category/categoryname/feed

var getDevice = function(ua) {
    var $ = {active: false, subactive: false};

    if (/mobile/i.test(ua)) {
        $.active = 'mobile';
        $.Mobile = true;
    }

    if (/like Mac OS X/.test(ua)) {
        $.active = 'iOS';
        $.iOS = /CPU( iPhone)? OS ([0-9\._]+) like Mac OS X/.exec(ua)[2].replace(/_/g, '.');
        if (/like Mac OS X/.test(ua)) {
            $.subactive = 'iPhone';
            $.iPhone = /iPhone/.test(ua);
        }
        if (/like Mac OS X/.test(ua)) {
            $.subactive = 'iPad';
            $.iPad = /iPad/.test(ua);
        }
    }

    if (/Android/.test(ua)) {
        $.active = 'Android';
        $.Android = /Android ([0-9\.]+)[\);]/.exec(ua)[1];
    }

    if (/webOS\//.test(ua)) {
        $.active = 'webOS';
        $.webOS = /webOS\/([0-9\.]+)[\);]/.exec(ua)[1];
    }

    if (/(Intel|PPC) Mac OS X/.test(ua)) {
        $.active = 'Safari';
        $.Safari = /(Intel|PPC) Mac OS X ?([0-9\._]*)[\)\;]/.exec(ua)[2].replace(/_/g, '.') || true;
    }

    if (/Windows NT/.test(ua)) {
        $.active = 'IE';
        $.IE = /Windows NT ([0-9\._]+)[\);]/.exec(ua)[1];
    }
    if (/MSIE/.test(ua)) {
        $.active = 'IE';
        $.IE = /MSIE ([0-9]+[\.0-9]*)/.exec(ua)[1];
    }
    if (/Trident/.test(ua)) {
        $.active = 'IE';
        $.IE = /Trident\/.*rv:([0-9]+[\.0-9]*)/.exec(ua)[1];
    }
    if (/Edge\/\d+/.test(ua)) {
        $.active = 'IE Edge';
        $.IE = /Edge\/(\d+)/.exec(ua)[1];
    }

    return $.active + ' ' + $[$.active] + ($.subactive && ' ' + $.subactive + ' ' + $[$.subactive]);
};

body {
   overflow-x: hidden;
}