 By default, the form will display the browser's native validation
       * UI (i.e. popup bubbles and invalid styles on invalid fields). You can
       * manually disable this; however, if you do, note that you will have to
       * manually style invalid *native* HTML fields yourself, as you are
       * explicitly preventing the native form from doing so.
       */
      disableNativeValidationUi: {
        type: Boolean,
        value: false
      },

      /**
      * Set the withCredentials flag when 