class_docstr: A generic tree branch.
  
  Parameters
  ----------
  children
      Child branches and/or leaves.
class_docstr_tok: ["A","generic","tree","branch",".","Parameters","--","--","--","--","--","children","Child","branches","and\/or","leaves","."]
code: def _repr_html_(self):
      from river.tree import viz
  
      div = viz.tree_to_html(self)
      return f"<div>{ET.tostring(div, encoding='unicode')}<style scoped>{viz.CSS}</style></div>"
  
imports: from __future__ import annotations
  import abc
  import typing
  from collections import defaultdict
  from queue import Queue
  from xml.etree import ElementTree
  import pandas
  from river import base
label_desc: Use image node_id 17 for calling the Branch obj's underlying member method code with example usage: obj._repr_html_() and returns: str, ET, str, viz, str