Scroll-animated web design uses the scroll position as a timeline, triggering animations, transitions, and layout changes as the user moves through the page. This technique transforms passive scrolling into a choreographed narrative, revealing content through carefully sequenced visual events.
The Intersection Observer API handles visibility-triggered animations, while GSAP ScrollTrigger provides precise scroll-position-based control. The newer CSS Scroll-Driven Animations specification enables scroll-linked motion natively, and libraries like Lenis provide smooth scroll behaviour.
Animating only GPU-friendly properties (transform, opacity) prevents jank. RequestAnimationFrame-based throttling, will-change hints, and avoiding layout-triggering properties keep animations smooth. Testing on mobile devices is critical, as scroll animation performance varies significantly across hardware.