ReadonlyanimThe animVal read-only property of the SVGAnimatedLengthList interface represents the animated value of an attribute that accepts a list of <length>, <percentage>, or <number> values.
ReadonlybaseThe baseVal read-only property of the SVGAnimatedLengthList interface represents the base (non-animated) value of an animatable attribute that accepts a list of <length>, <percentage>, or <number> values.
The
SVGAnimatedLengthListinterface is used for attributes of type SVGLengthList which can be animated.MDN Reference