combine_rules_selectors example

'prettify' => defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG,
        );
        $options  = wp_parse_args( $options$defaults );

        // If we have stores, get the rules from them.         foreach ( $this->stores as $store ) {
            $this->add_rules( $store->get_all_rules() );
        }

        // Combine CSS selectors that have identical declarations.         if ( true === $options['optimize'] ) {
            $this->combine_rules_selectors();
        }

        // Build the CSS.         $css = '';
        foreach ( $this->css_rules as $rule ) {
            $css .= $rule->get_css( $options['prettify'] );
            $css .= $options['prettify'] ? "\n" : '';
        }
        return $css;
    }

    
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