docs: def _locate_element(dom, el_content, transformer=None):
      """
      Find element containing `el_content` in `dom`. Use `transformer` function
      to content of all elements in `dom` in order to correctly transforming them
      to match them with `el_content`.
  
      Args:
          dom (obj): HTMLElement tree.
          el_content (str): Content of element will be picked from `dom`.
          transformer (fn, default None): Transforming function.
  
      Note:
          `transformer` parameter can be for example simple lambda::
  
              lambda x: x.strip()
  
      Returns:
          list: Matching HTMLElements.
      """
      return dom.find(
          None,
          fn=utils.content_matchs(el_content, transformer)
      )