code: function _isSafari() {
      var n = window.navigator;
      return n.userAgent.indexOf('Safari') > -1 && n.userAgent.indexOf('Chrome') == -1;
    }
docs: Same as the isIE(), but simply returns a boolean
  THIS IS TERRIBLE AND IS ONLY USED BECAUSE FULLSCREEN IN SAFARI IS BORKED
  If some other engine uses WebKit and has support for fullscreen they
  probably wont get native fullscreen until Safari's fullscreen is fixed
  @returns {Boolean} true if Safari