Height)
    ) {
      this.deactivate();
    }
  },

  findReferenceUnder(el) {
    while (el) {
      let parent = el.parentNode;
      if (el.nodeName === 'EMU-RHS' || el.nodeName === 'EMU-PRODUCTION') {
        return null;
      }
      if (
        el.nodeName === 'H1' &&
        parent.nodeName.match(/EMU-CLAUSE|EMU-ANNEX|EMU-INTRO/) &&
        parent.id
      ) {
        return { element: el, id: parent.id };
      } else if (el.nodeName === 'EMU-NT') {
        if (
          parent.nodeName === 'EMU