public function matchesNode($node)
 {
     $matches_node = parent::matchesNode($node);
     if ($matches_node && $this->childSelector) {
         $matches_node = false;
         if ($node->hasChildNodes()) {
             foreach ($node->childNodes as $child) {
                 $domXPath = new \DOMXPath($child->ownerDocument);
                 $converter = new CssSelectorConverter();
                 $xpath = $converter->toXPath($this->childSelector);
                 $results = $domXPath->query($xpath, $node);
                 foreach ($results as $result) {
                     if ($result === $child) {
                         $matches_node = true;
                     }
                 }
             }
         }
     }
     return $matches_node;
 }