function $SnifferProvider() {
  this.$get = ['$window', function($window) {
    var eventSupport = {};

    return {
      history: !!($window.history && $window.history.pushState),
      hashchange: 'onhashchange' in $window &&
                  // IE8 compatible mode lies
                  (!$window.document.documentMode || $window.document.documentMode > 7),
      hasEvent: function(event) {
        if (isUndefined(eventSupport[event])) {
          var divElm = $window.document.createElement('div');
          eventSupport[event] = 'on' + event in divElm;
        }

        return eventSupport[event];
      }
    };
  }];
}
!!! This is an undocumented "private" service !!!

@name angular.module.ng.$sniffer
@requires $window

@property {boolean} history Does the browser support html5 history api ?
@property {boolean} hashchange Does the browser support hashchange event ?

@description
This is very simple implementation of testing browser's features.