Craft modern, zero-dependency scroll animations using the native CSS animation-timeline property. Add hardware-accelerated scroll reveals and progress bars without loading heavy JavaScript libraries in your PWA.
This maps an animation entirely to the user's scroll depth across the scroll container.
Traditionally, CSS animations run based on time (e.g., 2 seconds). The animation-timeline property allows you to map the progression of a CSS animation directly to the user's scroll position, executing flawlessly on the browser's compositor thread without needing heavy JavaScript event listeners.
Use scroll() when you want an animation to progress as the entire container scrolls (like a reading progress bar at the top of an article). Use view() when you want an animation to execute specifically when a specific element enters or exits the viewport (like a card sliding up as you scroll to it).
As of late 2024, scroll-driven animations are natively supported in Chrome, Edge, and Opera. Safari and Firefox are still actively developing support. For unsupported browsers, the elements simply ignore the timeline property and will either animate instantly on page load or fall back to their final rendered state depending on how you write your fallback CSS.
Yes, though Tailwind doesn't have native shorthand utility classes for timelines yet. You can apply them using arbitrary values like [animation-timeline:view()] directly in your class lists, while writing the actual @keyframes in your global CSS file.
Progressive Web Apps strive to deliver a native mobile experience. Heavy JavaScript animation libraries often cause scroll jank and drain battery life on lower-end devices. By using the native CSS animation-timeline, scroll effects are offloaded entirely to the browser's compositor thread. This guarantees buttery-smooth, 60fps performance and preserves battery life, making your web app feel indistinguishable from a true native application.
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