Offset: "none" | "north" | "northeast" | "east" | "southeast" | "south" | "southwest" | "west" | "northwest" | "left" | "right" | "up" | "down" | "upper-left" | "upper-right" | "lower-left" | "lower-right" | ["north" | "northeast" | "east" | "southeast" | "south" | "southwest" | "west" | "northwest" | "left" | "right" | "up" | "down" | "upper-left" | "upper-right" | "lower-left" | "lower-right", number] | [number, number] | ["polar", number, number]
An offset from a position in units relative to the natural size of the node or edge