docs: def _isolate_text_node(self, element):
          """
          Isolate text nodes of element nodes.
  
          :param element: The element.
          :type element: hatemile.util.html.htmldomelement.HTMLDOMElement
          """
  
          if (
              (element.has_children_elements())
              and (self._is_valid_element(element))
          ):
              if self._is_valid_element(element):
                  child_nodes = element.get_children()
                  for child_node in child_nodes:
                      if isinstance(child_node, HTMLDOMTextNode):
                          span = self.html_parser.create_element('span')
                          span.set_attribute(
                              AccessibleCSSImplementation.DATA_ISOLATOR_ELEMENT,
                              'true'
                          )
                          span.append_text(child_node.get_text_content())
  
                          child_node.replace_node(span)
              children = element.get_children_elements()
              for child in children:
                  self._isolate_text_node(child)