ReadonlyanimThe animVal read-only property of the SVGAnimatedRect interface represents the current animated value of the viewBox attribute of an SVG element as a read-only DOMRectReadOnly object. It provides access to the rectangle's dynamic state, including the x, y, width, and height values during the animation.
ReadonlybaseThe baseVal read-only property of the SVGAnimatedRect interface represents the current non-animated value of the viewBox attribute of an SVG element.
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SVGAnimatedRectinterface represents an SVGRect attribute that can be animated.MDN Reference