The animVal read-only property of the SVGAnimatedBoolean interface represents the current animated value of the associated animatable boolean SVG attribute. If the attribute is not animated, animVal is the same as SVGAnimatedBoolean.baseVal.
The baseVal property of the SVGAnimatedBoolean interface is the value of the associated animatable boolean SVG attribute in its base (none-animated) state. It reflects the value of the associated animatable boolean attribute when no animations are applied.