Sequence Scrolling JS Effect

Image sequence scrolling — popularized by Apple's product pages — creates a cinematic effect where scrolling controls a frame-by-frame animation. This guide shows you how to build it from scratch.

Image Sequence Setup

We cover image preparation, preloading strategies, and canvas rendering to display hundreds of frames smoothly. Proper preloading is critical to avoid janky playback as users scroll.

Scroll Synchronization

Using Intersection Observer and scroll position calculations, we map scroll progress to frame indices. The result is a fluid, scroll-driven animation that feels like scrubbing through a video.