protected function processDeclaration($node) {
        $selectors = $node instanceof \Sabberworm\CSS\RuleSet\DeclarationBlock ? $node->getSelectors() : [];
        foreach ($selectors as $selector) {
            // The blocks containing .dir-rtl are always accepted as is.
            if (strpos($selector->getSelector(), '.dir-rtl') !== false) {
                return;
            }
        }
        return parent::processDeclaration($node);
    }