docs: function( state, base, useAria ) {
  			base = base || 'cke';
  
  			switch ( state ) {
  				case CKEDITOR.TRISTATE_ON:
  					this.addClass( base + '_on' );
  					this.removeClass( base + '_off' );
  					this.removeClass( base + '_disabled' );
  					useAria && this.setAttribute( 'aria-pressed', true );
  					useAria && this.removeAttribute( 'aria-disabled' );
  					break;
  
  				case CKEDITOR.TRISTATE_DISABLED:
  					this.addClass( base + '_disabled' );
  					this.removeClass( base + '_off' );
  					this.removeClass( base + '_on' );
  					useAria && this.setAttribute( 'aria-disabled', true );
  					useAria && this.removeAttribute( 'aria-pressed' );
  					break;
  
  				default:
  					this.addClass( base + '_off' );
  					this.removeClass( base + '_on' );
  					this.removeClass( base + '_disabled' );
  					useAria && this.removeAttribute( 'aria-pressed' );
  					useAria && this.removeAttribute( 'aria-disabled' );
  					break;
  			}
  		}