Function getIntersectionChangeEntry

src/utils/intersection-observer-3p-host.js:50–56

(element, owner, hostViewport)

 * @return {!IntersectionObserverEntry} A change entry.
 */
export function getIntersectionChangeEntry(element, owner, hostViewport) {
  const intersection =
    rectIntersection(element, owner, hostViewport) ||
    layoutRectLtwh(0, 0, 0, 0);
  const ratio = intersectionRatio(intersection, element);
  return calculateChangeEntry(element, hostViewport, intersection, ratio);
}

/**
 * A class to help amp-iframe and amp-ad nested iframe listen to intersection