code: def _scroll_down(self, cli):
          " Scroll window down. "
          info = self.render_info
  
          if self.vertical_scroll < info.content_height - info.window_height:
              if info.cursor_position.y <= info.configured_scroll_offsets.top:
                  self.content.move_cursor_down(cli)
  
              self.vertical_scroll += f _scroll_down(self, cli):
          " Scroll window down. "
          info = self.render_info
  
          if self.vertical_scroll < info.content_height - info.window_height:
              if info.cursor_position.y <= info.configured_scroll_offsets.top:
                  self.content.move_cursor_down(cli)
  
              self.vertical_scroll += 1
docs: Scroll window down.