docs: def as_dict(self):
          """
          Serializes the object necessary data in a dictionary.
  
          :returns: Serialized data in a dictionary.
          :rtype: dict
          """
  
          element_dict = super(HTMLElement, self).as_dict()
  
          if hasattr(self, 'content'):
              element_dict['content'] = self.content
  
          return element_dict