code: function() {
          annotationsDiv.children().remove();
          container.find('.kelmu-arrow-handle').remove();
          container.children('svg').first().remove();
          container.find('audio.kelmu-annotation-sound').each(function() {
            try {
              this.pause();
            } catch (err) {
              // Ignore if stopping sounds raised any errors
            }
          });
        }
docs: default value which can be changed by sending animationLength message