docs: def press_by_tooltip(self, tooltip):
      """
      Click on a HTML element with a given tooltip.
  
      This is very useful if you're clicking on icon buttons, etc.
      """
      for button in find_by_tooltip(world.browser, tooltip):
          try:
              button.click()
              break
          except:  # pylint:disable=bare-except
              pass
      else:
          raise AssertionError("No button with tooltip '{0}' found"
                               .format(tooltip))