private function _isContainWordSelector($node)
    {
        if ($node->hasAttribute($this->_attrName)) {
            $items = explode(" ", trim($node->getAttribute($this->_attrName)));
            foreach ($items as $item) {
                if (preg_match("/^\w+$/", $item) && $this->_value == $item) {
                    return true;
                }
            }
        }

        return false;
    }