@@ -138,13 +138,22 @@ def _get_childNodes(self) -> NodeList:
138138 """Indirect accessor to get the `childNodes` property."""
139139 return self ._child_nodes
140140
141+ def _get_child_node (self , index : c_ulong ) -> Optional [Node ]:
142+ """Accessor to get the `childNodes`property."""
143+ if self .parentNode is None :
144+ return None
145+ siblingNodes = self .parentNode .childNodes
146+ if siblingNodes .length == 0 :
147+ return None
148+ return siblingNodes .item (index )
149+ 141150 def _get_firstChild (self ) -> Optional [Node ]:
142151 """Indirect accessor to get the `firstChild` property."""
143- raise NotImplementedError ( )
152+ return self . _get_child_node ( 0 )
144153
145154 def _get_lastChild (self ) -> Node :
146155 """Indirect accessor to get the `lastChild` property."""
147- raise NotImplementedError ( )
156+ return self . _get_child_node ( self . childNodes . length - 1 )
148157
149158 def _get_previousSibling (self ) -> Node :
150159 """Indirect accessor to get the `previousSibling` property."""
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