 '_ariaLabelledByChanged',
        type: String
      },

      _ariaDescribedBy: {
        observer: '_ariaDescribedByChanged',
        type: String
      },

      /**
       * The initial number of rows.
       *
       * @attribute rows
       * @type number
       * @default 1
       */
      rows: {
        type: Number,
        value: 1
      },

      /**
       * The maximum number of rows this element can grow to until it
       * scrolls. 0 means no maximum.
       *
       * @attribute maxRows
 