class_docstr: A DOM element that can be mutated.
code: def append(self, child: DOMElement):
      pass
  
imports: from __future__ import annotations
  import abc
  import dataclasses
  import functools
  import sys
  import uuid
  from typing import Any, Union
label_desc: Use image node_id 2 for calling the DynamicDOMElement obj's underlying member method code with example usage: obj.append(child) without return types