10 years after scroll-driven animations were first proposed, they’re finally here — no JavaScript, no dependencies, no libraries, just pure CSS.

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CSS scroll-driven animations allow for dynamic effects linked to scrolling without the need for JavaScript or external libraries. These animations run on the main thread, providing smooth, high-performance experiences. They are currently supported in Chrome and Firefox (with a flag), but not yet in Safari. Scroll progress timelines and view progress timelines are two types of scroll-driven animations that can be easily implemented and customized in CSS.

An Introduction To CSS Scroll-Driven Animations: Scroll And View Progress Timelines — Smashing Magazine