Intersection Observer - Browser Support

intersection-support.js

// If we don't have support for intersection observer, load the images immediately
if (!('IntersectionObserver' in window)) {
  Array.from(images).forEach(image => preloadImage(image));
} else {
  // It is supported, load the images
  observer = new IntersectionObserver(onIntersection, config);
  images.forEach(image => {
 
   observer.observe(image);
  });
}