docs: def insertAdjacentHTML(self, position: str, html: str) -> None:
          """Parse ``html`` to DOM and insert to ``position``.
  
          ``position`` is a case-insensive string, and must be one of
          "beforeBegin", "afterBegin", "beforeEnd", or "afterEnd".
          """
          df = self._parse_html(html)
          pos = position.lower()
          if pos == 'beforebegin':
              self.before(df)
          elif pos == 'afterbegin':
              self.prepend(df)
          elif pos == 'beforeend':
              self.append(df)
          elif pos == 'afterend':
              self.after(df)
          else:
              raise ValueError(
                  'The value provided ({}) is not one of "beforeBegin", '
                  '"afterBegin", "beforeEnd", or "afterEnd".'.format(position)
              )