https://www.s3pweb.com/wp-content/themes/s3p-theme/assets/js/section.js?ver=7.1.3

1document.addEventListener("DOMContentLoaded", function () {
2    const classes = ["anim-slide-b-t", "anim-slide-l-r", "anim-slide-r-l"];
3
4    const observer = new IntersectionObserver(entries => {
5        entries.forEach(entry => {
6            if (entry.isIntersecting) {
7                entry.target.classList.add("active");
8                observer.unobserve(entry.target);
9            }
10        });
11    }, { threshold: 0.2 });
12
13    classes.forEach(className => {
14        document.querySelectorAll(`.${className}`).forEach(el => observer.observe(el));
15    });
16});