docs: public void highlightElement() {
  
          if (m_highlighting == null) {
              m_highlighting = new CmsHighlightingBorder(m_position, CmsHighlightingBorder.BorderColor.red);
              RootPanel.get().add(m_highlighting);
          } else {
              m_highlighting.setPosition(CmsPositionBean.getBoundingClientRect(getElement()));
          }
      }