Horizontal Scroll Section
A high-performance CSS-only unit designed to translate content horizontally during vertical scroll, providing an immersive experience without JavaScript overhead.
Overview
The Horizontal Scroll Section leverages modern CSS view-timeline to create a smooth, performant horizontal translation of content as the user scrolls vertically. This implementation replaces traditional, resource-intensive JavaScript scroll listeners with native browser logic, ensuring zero-bloat performance and buttery-smooth frame rates.
Key Features
- Native CSS Animation: Powered by
view-timelineandanimation-timelinefor hardware-accelerated transitions. - Sticky Viewport Locking: Keeps content anchored to the viewport throughout the duration of the horizontal movement.
- Progressive Enhancement: Provides a robust vertical fallback for browsers that do not yet support CSS scroll-driven animations.
- Ultra-Lightweight: Minimal code footprint with zero external dependencies.
Technical Specifications
| Parameter | Value |
|---|---|
| Logic | CSS View Timeline |
| Styling | Vanilla CSS (Modern Syntax) |
| APIs | view-timeline, animation-timeline |
| Payload | < 1KB |
Implementation
1. Structural CSS
/* Container defines the scroll height/duration */
.horizontal-scroll-section {
height: 250vh;
view-timeline: --hs-sec;
/* Sticky container stays in view during horizontal scroll */
.sticky {
position: sticky;
top: 0;
height: 100vh;
max-width: 100%;
overflow-x: hidden;
/* Wrapper moves horizontally based on scroll progress */
.wrapper {
display: flex;
width: fit-content;
animation: move linear both;
animation-timeline: --hs-sec;
animation-range: contain;
}
}
}
/* Keyframes for horizontal translation */
@keyframes move {
to {
translate: calc(-100% + 100vw) 0;
}
}
/* Fallback for legacy browsers or those lacking scroll-animation support */
@supports not (animation-timeline: view()) {
.horizontal-scroll-section {
height: auto;
.sticky {
position: static;
height: auto;
.wrapper {
width: auto;
flex-direction: column;
animation: none;
}
}
}
}