CSS Smooth Scroll Demo - Online scroll‑behavior
Toggle scroll‑behavior: smooth and click anchor links to see the scrolling animation. Implement modern UX.
UD5 Toolkit
Online CSS-Only Slider — Powered by Scroll Snap & Scroll Timeline
animation-timeline: scroll()
animation-timeline: scroll() CSS feature. This provides buttery-smooth 60fps performance because it runs on the browser's compositor thread.
animation-timeline: scroll()) is supported in Chrome 115+ and Edge 115+ (August 2023). Firefox and Safari are actively implementing it. The generated code includes fallback behavior — the carousel and snap work everywhere, while the progress bar gracefully degrades in unsupported browsers.
setInterval, requestAnimationFrame, or touch event listeners, which can cause jank on the main thread. A CSS scroll-driven carousel offloads all animation to the GPU compositor thread, resulting in smoother motion. It's also lighter (zero JS bytes), more accessible (native scroll behavior), and respects user preferences like prefers-reduced-motion. The tradeoff is that it requires actual scroll interaction rather than auto-play, though you can add minimal JS for auto-scrolling if desired.
<a href="#slide-3">) combined with scroll-behavior: smooth for clickable dot navigation. For auto-highlighting dots, a few lines of JavaScript with an IntersectionObserver or scroll event listener work perfectly as a progressive enhancement.
aria-label attributes to the scroll container, role="region" with a meaningful label, and ensuring sufficient color contrast on slide text. The scroll container should also have a visible focus indicator.
scroll-behavior: smooth on the container. For the progress bar animation, its speed is directly tied to scroll position via animation-timeline: scroll(), so it moves in perfect sync with scrolling. If you want a slower auto-scroll effect, you'd need a small JavaScript helper to programmatically scroll the container.
background-image: url('your-image.jpg') and set background-size: cover; background-position: center;. The scroll-snap mechanism works identically regardless of slide content — images, videos, cards, or any HTML elements. Just ensure each slide maintains the correct dimensions to fill the scroll container.
Toggle scroll‑behavior: smooth and click anchor links to see the scrolling animation. Implement modern UX.
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