Scroll-Driven CSS Animation Generator
Generate reveal, scroll progress and parallax CSS with a scrollable sandbox, runtime feature checks and reduced-motion guards.
Enabling local controls…
Reduced-motion protection is always enabled; content stays visible without timeline support. The decorative progress bar is hidden in fallback mode. Animations follow scroll position rather than seconds.
Scroll sandbox and CSS
Current-browser support is checked after activation.
Scroll inside the preview. Tab to its scroll region, then use arrows or Page Down. Syntax support does not prove visual behavior.
CSS
Preview: first 32,000 characters. Copy, download and expanded text retain all content. Select complete text if copying fails.
.scroll-demo-scroller { overflow: auto; block-size: 24rem; position: relative; }
.scroll-demo-item, .scroll-demo-layer { opacity: 1; transform: none; }
.scroll-demo-progress { display: none; position: sticky; top: 0; height: 6px; background: #2563eb; transform-origin: left center; z-index: 1; }
/* Content is visible when timelines are unsupported or motion is reduced. */
@media (prefers-reduced-motion: no-preference) {
@supports ((animation-timeline: view(block)) and (animation-range: entry 0% entry 100%)) {
@keyframes scroll-demo-motion {
from { opacity: 0; transform: translateY(48px); }
to { opacity: 1; transform: none; }
}
.scroll-demo-item {
animation: scroll-demo-motion auto ease-out both;
animation-timeline: view(block);
animation-range: entry 0% entry 100%;
}
}
}
@media (prefers-reduced-motion: reduce) {
.scroll-demo-item, .scroll-demo-layer { animation: none; opacity: 1; transform: none; }
.scroll-demo-progress { display: none; animation: none; }
}Expand complete selectable text
.scroll-demo-scroller { overflow: auto; block-size: 24rem; position: relative; }
.scroll-demo-item, .scroll-demo-layer { opacity: 1; transform: none; }
.scroll-demo-progress { display: none; position: sticky; top: 0; height: 6px; background: #2563eb; transform-origin: left center; z-index: 1; }
/* Content is visible when timelines are unsupported or motion is reduced. */
@media (prefers-reduced-motion: no-preference) {
@supports ((animation-timeline: view(block)) and (animation-range: entry 0% entry 100%)) {
@keyframes scroll-demo-motion {
from { opacity: 0; transform: translateY(48px); }
to { opacity: 1; transform: none; }
}
.scroll-demo-item {
animation: scroll-demo-motion auto ease-out both;
animation-timeline: view(block);
animation-range: entry 0% entry 100%;
}
}
}
@media (prefers-reduced-motion: reduce) {
.scroll-demo-item, .scroll-demo-layer { animation: none; opacity: 1; transform: none; }
.scroll-demo-progress { display: none; animation: none; }
}Example HTML
Preview: first 32,000 characters. Copy, download and expanded text retain all content. Select complete text if copying fails.
<div class="scroll-demo-scroller" tabindex="0" role="region" aria-label="Scroll animation demo"> <div class="scroll-demo-progress" aria-hidden="true"></div> <article class="scroll-demo-item"><div class="scroll-demo-layer">Your content</div></article> <!-- Add enough content to make this container scroll. --> </div>
Expand complete selectable text
<div class="scroll-demo-scroller" tabindex="0" role="region" aria-label="Scroll animation demo"> <div class="scroll-demo-progress" aria-hidden="true"></div> <article class="scroll-demo-item"><div class="scroll-demo-layer">Your content</div></article> <!-- Add enough content to make this container scroll. --> </div>
Usage and limits
Choose a preset, class prefix, distance and easing. Scroll or keyboard-focus the isolated preview; copy CSS and example markup. The generated container uses a native view() or scroll(nearest block) timeline.
CSS.supports checks only this browser's syntax support, not visual correctness or every browser version. Unsupported or reduced-motion environments keep content visible and hide the decorative progress bar. No JavaScript polyfill; animations follow scroll position, not a duration in seconds.
Sources
How to use this tool
Choose a preset, class prefix, distance and easing. Scroll or keyboard-focus the isolated preview; copy CSS and example markup. The generated container uses a native view() or scroll(nearest block) timeline.
When not to use it
CSS.supports checks only this browser's syntax support, not visual correctness or every browser version. Unsupported or reduced-motion environments keep content visible and hide the decorative progress bar. No JavaScript polyfill; animations follow scroll position, not a duration in seconds.