docs: def preformatted_text(source: str) -> str:
      """Renders preformatted text box"""
      environ.abort_thread()
  
      if not source:
          return ''
  
      source = render_utils.html_escape(source)
  
      return '<pre class="preformatted-textbox">{text}</pre>'.format(
          text=str(textwrap.dedent(source))
      )