tracking when users hit specific milestones helps identify where ur landing page flow breaks. instead of heavy javascript listeners, u can use a simple intersection observer to trigger classes when elements enter the viewport. this is
way more efficient than monitoring every single scroll event.
const observer = new IntersectionObserver((entries) => {entries.forEach(entry => {if (entry.isIntersecting) {entry.target.classList.add('visible');}});});document.querySelectorAll('.track-point').forEach(el => observer.observe(el));>use this to trigger subtle animations or log custom events in your analytics. ⚡**don't forget to throttle ur observers if u're watching dozens of elements at once