0;

      this._setSecondaryRatio(secondaryRatio);
      this._transformProgress(this.$.secondaryProgress, secondaryRatio);
      this._transformProgress(this.$.primaryProgress, mainRatio);

      this.secondaryProgress = secondaryProgress;

      this.setAttribute('aria-valuenow', value);
      this.setAttribute('aria-valuemin', min);
      this.setAttribute('aria-valuemax', max);
    },

    _disabledChanged: function(disabled) {
      this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
    }