args=Array.prototype.slice.call(arguments,0);this._logger('warn',args);},_error:function(){var args=Array.prototype.slice.call(arguments,0);this._logger('error',args);},_logf:function(){return this._logPrefix.concat(this.is).concat(Array.prototype.slice.call(arguments,0));}};Polymer.Base._logPrefix=function(){var color=window.chrome&&!/edge/i.test(navigator.userAgent)||/firefox/i.test(navigator.userAgent);return color?['%c[%s::%s]:','font-weight: bold; background-color:#EEEE00;']:['[%s::%s]:'];...