IntersectionObserver

const observer = new IntersectionObserver(entries => {
	 if (!entries[0].isIntersecting) { // Return if the element isn't on screen
		 return;
	 }



 }, {
	 rootMargin: '0px 0px 200px', // margin on the root to check for intersection
	 threshold: 1
  }); 

  observer.observe(<element>);