lazy load images.js

var lazyBackgrounds = [].slice.call(document.querySelectorAll(".lazy-background"));

    if ("IntersectionObserver" in window) {
        let lazyBackgroundObserver = new IntersectionObserver(function (entries, observer) {
            entries.forEach(function (entry) {
                if (entry.isIntersecting) {
                    console.log();
                    if (entry.target.getAttribute('data-image') === 'universe') {
                        entry.target.innerHTML = '<img src="images/universe.jpg?v=1" alt="Universe" />';
                    }
                    entry.target.classList.add("visible");
                    lazyBackgroundObserver.unobserve(entry.target);
                }
            });
        });

        lazyBackgrounds.forEach(function (lazyBackground) {
            lazyBackgroundObserver.observe(lazyBackground);
        });
    }

good work

good work
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