Definition
Intersection Observer defines IntersectionObserver
[Exposed=Window]
interface IntersectionObserver {
constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options = {});
readonly attribute (Element or Document)? root;
readonly attribute DOMString rootMargin;
readonly attribute DOMString scrollMargin;
readonly attribute FrozenArray<double> thresholds;
undefined observe(Element target);
undefined unobserve(Element target);
undefined disconnect();
sequence<IntersectionObserverEntry> takeRecords();
};