docs: def img_src(url, class_="", responsive=False, lazy_load=False, id_=""):
      """
      Create an image src
  
      {{ xyz.jpg | img_src }}
  
      :param url:
      :param class_:
      :param responsive:
      :param lazy_load:
      :param id_:
      :return:
      """
      if not url.startswith("http://") and not url.startswith("https://"):
          url = static_url(url)
  
      data_src = ""
      if responsive:
          class_ += " responsive"
      if lazy_load:
          data_src = url
          # 1x1 image
          url = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNgYAAAAAMAASsJTYQAAAAASUVORK5CYII="
          class_ += " lazy"
  
      img = "<img src=\"{src}\" class=\"{class_}\" id=\"{id_}\" data-src={data_src}>" \
          .format(src=url, class_=class_, id_=id_, data_src=data_src)
      return Markup(img)