Get browser details using navigator.
function NavigatorExample() {
  var txt;
  txt = "Browser CodeName: " + navigator.appCodeName + "; ";
  txt+= "Browser Name: " + navigator.appName + "; ";
  txt+= "Browser Version: " + navigator.appVersion  + "; ";
  txt+= "Cookies Enabled: " + navigator.cookieEnabled  + "; ";
  txt+= "Platform: " + navigator.platform  + "; ";
  txt+= "User-agent header: " + navigator.userAgent  + "; ";
  console.log("NavigatorExample", txt);
}