code: function( newRules ) {
  			// Check arguments and constraints. Clear cache.
  			// Note: we pass true in the 3rd argument, because disallow() should never
  			// be blocked by custom configuration.
  			if ( !beforeAddingRule( this, newRules, true ) )
  				return false;
  
  			if ( typeof newRules == 'string' )
  				newRules = parseRulesString( newRules );
  
  			addAndOptimizeRules( this, newRules, null, this.disallowedContent, this._.disallowedRules );
  
  			return true;
  		}
docs: Adds disallowed content rules to the filter.
  
  Read about rules formats in the [Allowed Content Rules guide](#!/guide/dev_allowed_content_rules).
  
  // Disallow all styles on the image elements.
  editor.filter.disallow( 'img{*}' );
  
  // Disallow all span and div elements.
  editor.filter.disallow( 'span div' );
  
  @since 4.4
  @param {CKEDITOR.filter.disallowedContentRules} newRules Rule(s) to be added.