operties
            .scopePropertiesFromStyles(this._styles);
          // mixin customStyle
          styleProperties.mixinCustomStyle(this._properties, this.customStyle);
          styleProperties.reify(this._properties);
        }
        return this._properties;
      },

      _needsStyleProperties: function() {},

      _computeStyleProperties: function() {
        return this._styleProperties;
      },

      /**
       * Re-evaluates and applies custom CSS properties to all elements in the
       *