docs: def reset(self):
          """
          Reset the progressbar to 0, hide it and set original text message at
          background.
          """
          self.hide()
          self.tag.class_name = "progress-bar progress-bar-striped active"
          self.tag.aria_valuemin = 0
          self.tag.style.width = "{}%".format(0)
          self.tag.text = self.original_message