text: 'use strict';
  
  var nav = window.navigator;
  var ua = nav.userAgent.toLowerCase();
  var uaSniffer = {
    isIE: /msie/.test(ua),
    isIE_5or6: /msie [56]/.test(ua),
    isOpera: /opera/.test(ua),
    isChrome: /chrome/.test(ua),
    isWindows: /win/i.test(nav.platform)
  };
  
  module.exports = uaSniffer;
  