IntersectionObserverEntry constructor
      const
      IntersectionObserverEntry({})
     
    
    
Implementation
const IntersectionObserverEntry({Rect? boundingClientRect, Rect? intersectionRect, Rect? rootBounds, Size? size})
    : boundingClientRect = boundingClientRect ?? Rect.zero,
      intersectionRect = intersectionRect ?? Rect.zero,
      rootBounds = rootBounds ?? Rect.zero,
      size = size ?? Size.zero;