code: def render_attrs(self):
          
          ret = []
          for k, v in self.attrs.items():
              if v:
                  if v is bool:
                      ret.append(" %s" % self._SPECIAL_ATTRS.get(k, k))
                  else:
                      fnc = self._FORMAT_ATTRS.get(k, None)
                      val = fnc(v) if fnc else v
                      ret.append(' %s="%s"' % (self._SPECIAL_ATTRS.get(k, k), val))
          return "".join(ret)
docs: Renders the tag's attributes using the formats and performing special attributes name substitution.