Definition
Intersection Observer defines IntersectionObserverEntryInit
dictionary IntersectionObserverEntryInit {
required DOMHighResTimeStamp time;
required DOMRectInit? rootBounds;
required DOMRectInit boundingClientRect;
required DOMRectInit intersectionRect;
required boolean isIntersecting;
required boolean isVisible;
required double intersectionRatio;
required Element target;
};