ReadonlyanimThe animVal read-only property of the SVGAnimatedPreserveAspectRatio interface represents the value of the preserveAspectRatio attribute of an SVG element after any animations or transformations are applied.
ReadonlybaseThe baseVal read-only property of the SVGAnimatedPreserveAspectRatio interface represents the base (non-animated) value of the preserveAspectRatio attribute of an SVG element.
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SVGAnimatedPreserveAspectRatiointerface represents attributes of type SVGPreserveAspectRatio which can be animated.MDN Reference