class_docstr: A factory class for HTML Themes.
class_docstr_tok: ["A","factory","class","for","HTML","Themes","."]
docstr: Load built-in themes.
docstr_tok: ["Load","built-in","themes","."]
code: def load_builtin_themes(self) -> None:
      """Load built-in themes."""
      themes = self.find_themes(path.join(package_dir, "themes"))
      for name, theme in themes.items():
          self.themes[name] = theme
  
imports: from __future__ import annotations
  import configparser
  import os
  import shutil
  import sys
  import tempfile
  from os import path
  from typing import TYPE_CHECKING, Any
  from zipfile import ZipFile
  import contextlib
  from sphinx import package_dir
  from sphinx.config import check_confval_types
  from sphinx.errors import ThemeError
  from sphinx.locale import __
  from sphinx.util import logging
  from sphinx.util.osutil import ensuredir
label_desc: Use image node_id 2 for calling the HTMLThemeFactory obj's underlying member method code with example usage: obj.load_builtin_themes() without return types