whole_func_string: function(args) {
                  
                  return _.template('<filter><feGaussianBlur in="SourceAlpha" stdDeviation="${blur}"/><feOffset dx="${dx}" dy="${dy}" result="offsetblur"/><feFlood flood-color="${color}"/><feComposite in2="offsetblur" operator="in"/><feMerge><feMergeNode/><feMergeNode in="SourceGraphic"/></feMerge></filter>', {
                      dx: args.dx || 0,
                      dy: args.dy || 0,
                      color: args.color || 'black',
                      blur: _.isFinite(args.blur) ? args.blur : 4
                  });
              }
func_code_string: function(args) {
                  
                  return _.template('<filter><feGaussianBlur in="SourceAlpha" stdDeviation="${blur}"/><feOffset dx="${dx}" dy="${dy}" result="offsetblur"/><feFlood flood-color="${color}"/><feComposite in2="offsetblur" operator="in"/><feMerge><feMergeNode/><feMergeNode in="SourceGraphic"/></feMerge></filter>', {
                      dx: args.dx || 0,
                      dy: args.dy || 0,
                      color: args.color || 'black',
                      blur: _.isFinite(args.blur) ? args.blur : 4
                  });
              }
func_documentation_string: `dx` ... horizontal shift `dy` ... vertical shift `blur` ... blur `color` ... color