Build a Horizontal Scroll Engine in JavaScript — No Libraries |

Published: 03 July 2026
on channel: ScratchStart

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Learn how to build a horizontal scroll engine in pure JavaScript — vertical scroll input converted to smooth horizontal panel movement, with progress clamping, resize handling, and five fully styled planet cards. No libraries, no CSS scroll snapping tricks, just a real scroll engine built from scratch.

This is how Apple, Linear, and premium product sites create that "moving through a world" feeling — and now you'll know exactly how it works under the hood.

🔥 What You'll Learn:
Converting vertical scroll progress to horizontal translateX movement
Calculating scroll progress relative to a specific page section
Clamping scroll values so the track never overshoots
Handling window resize so the engine recalculates correctly
Using position:sticky to keep the horizontal section locked in view
Building five distinct planet cards with CSS radial gradients
Saturn's ring using a CSS ::before pseudo-element
Making the full engine responsive across desktop, tablet, mobile

If this is the kind of scroll interaction you've seen on premium sites and wondered how it works — now you know.
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