user agent

detectbrowsers

// See also: https://github.com/azer/environ
//http://nextmarvel.net/blog/2011/02/one-line-javascript-browser-detection/

var IE6 = /msie 6/i.test(navigator.userAgent),
    IE7 = /msie 7/i.test(navigator.userAgent),
    IE8 = /msie 8/i.test(navigator.userAgent),
    IE9 = /msie 9/i.test(navigator.userAgent),
    IE10 = /msie 9/i.test(navigator.userAgent),
    
    SAFARI = /safari/i.test(navigator.userAgent),
    FIREFOX = /firefox/i.test(navigator.userAgent),
    CHROME = /chrome/i.test(navigator.userAgent),
    IPHONE = /iphone/i.test(navigator.userAgent),
    
    MAC = /mac/i.test(navigator.userAgent),
    WINDOWS = /win/i.test(navigator.appVersion),
    LINUX = /linux/i.test(navigator.appVersion),  
    UNIX = /X11/i.test(navigator.appVersion),
  
    KINDLE = /kindle/i.test(navigator.userAgent);