
      results: {
        type: Number
      },

      /**
       * Bind this to the `<input is="iron-input">`'s `accept` property, , used with type=file.
       */
      accept: {
        type: String
      },

      /**
       * Bind this to the `<input is="iron-input">`'s `multiple` property, , used with type=file.
       */
      multiple: {
        type: Boolean
      },

      _ariaDescribedBy: {
        type: String,
        value: ''
      },

      _ariaLabelledBy: {
        type: String,
        v