code: public String getSrcSet() {
  
          StringBuffer result = new StringBuffer(128);
          if (m_srcSet != null) {
              int items = m_srcSet.size();
              for (Map.Entry<Integer, CmsJspImageBean> entry : m_srcSet.entrySet()) {
                  CmsJspImageBean imageBean = entry.getValue();
                  // append the image source
                  result.append(imageBean.getSrcUrl());
                  result.append(" ");
                  // append width
                  result.append(imageBean.getScaler().getWidth());
                  result.append("w");
                  if (--items > 0) {
                      result.append(", ");
                  }
              }
          }
          return result.toString();
      }
docs: Generates a srcset attribute parameter list from all images added to this image bean.<p>
  
  @return a srcset attribute parameter list from all images added to this image bean