Intersection observerThe IntersectionObserver API asynchronously observes changes in the intersection of a target element with an ancestor element or with a top-level document's viewport.widely2019-03-252021-09-25https://w3c.github.io/IntersectionObserver/intersectionobserverhttps://developer.mozilla.org/docs/Web/API/IntersectionObserverapi.IntersectionObserverapi.IntersectionObserver.IntersectionObserverapi.IntersectionObserver.IntersectionObserver.options_root_parameter_Documentapi.IntersectionObserver.delayapi.IntersectionObserver.disconnectapi.IntersectionObserver.observeapi.IntersectionObserver.rootapi.IntersectionObserver.rootMarginapi.IntersectionObserver.scrollMarginapi.IntersectionObserver.takeRecordsapi.IntersectionObserver.thresholdsapi.IntersectionObserver.trackVisibilityapi.IntersectionObserver.unobserveapi.IntersectionObserverEntryapi.IntersectionObserverEntry.IntersectionObserverEntryapi.IntersectionObserverEntry.boundingClientRectapi.IntersectionObserverEntry.intersectionRatioapi.IntersectionObserverEntry.intersectionRectapi.IntersectionObserverEntry.isIntersectingapi.IntersectionObserverEntry.isVisibleapi.IntersectionObserverEntry.rootBoundsapi.IntersectionObserverEntry.targetapi.IntersectionObserverEntry.timehttps://nowyoucanuse.com/features--intersection-observer.html