What is the difference between CSS scroll-timeline and IntersectionObserver?

CSS scroll-timeline (animation-timeline: view()) drives the animation straight from the scroll position with no JavaScript, but it is newer and not yet supported everywhere. IntersectionObserver is a JavaScript API that fires when an element enters the viewport and works in every modern browser. This tool generates both so you can match the technique to your browser support needs.

Do the generated animations respect reduced-motion preferences?

Yes. Every output includes a prefers-reduced-motion guard. The CSS and IntersectionObserver snippets disable the transition and show the final state for users who request reduced motion, and the Framer Motion output honors the same preference through its viewport options.

What happens in browsers that do not support scroll-timeline?

The CSS scroll-timeline output is wrapped in an @supports (animation-timeline: view()) block. Browsers without support skip the animation entirely and render the element in its final, visible state, so content is never hidden. That makes it safe to use as progressive enhancement.

How does the stagger control work?

Stagger adds an incremental delay between sibling elements so they reveal in a cascade rather than all at once. The IntersectionObserver output sets a --reveal-index custom property per element and offsets the transition-delay by it, while the Framer Motion snippet multiplies the delay by an index prop.

Can I make the animation replay every time the element scrolls into view?

Yes. Turn off "animate only once" and the IntersectionObserver and Framer outputs will remove the in-view state when the element leaves the viewport, so the reveal re-runs on the next scroll into view. Leave it on for a one-time reveal that stays put.

What is the threshold setting for?

Threshold is the fraction of the element that must be visible before the animation triggers, from 0 (any pixel) to 1 (fully visible). It maps to the IntersectionObserver threshold and the Framer Motion viewport amount, letting you control how far an element scrolls in before it reveals.

Scroll Animation Helper

Generate scroll-triggered reveal animations for modern CSS scroll-timeline, vanilla IntersectionObserver, a React hook, or Framer Motion. Live preview with replay, ten effects, stagger, and a copy-ready, shareable snippet.

About this ToolHow it works, benefits & use cases

Scroll-triggered reveals are everywhere on modern sites, but the right way to build them depends on how much browser support you need. This helper generates production code for all the common approaches from one config: modern CSS scroll-driven animations that run with zero JavaScript via animation-timeline: view(), the universally-supported vanilla IntersectionObserver pattern, a reusable useScrollReveal React hook, and a Framer Motion whileInView snippet. Pick from ten effects (fade, slide in four directions, zoom in or out, flip, rotate, and blur-in), then tune duration, delay, slide distance, easing, the intersection threshold, and a stagger between siblings. A live preview demonstrates the reveal with a Replay button so you can re-trigger it as you tweak, and a support note tells you exactly which browsers cover the technique you picked. Every snippet ships a prefers-reduced-motion guard, and the CSS scroll-timeline output is wrapped in an @supports block so unsupported browsers degrade to the final state.

How to Use

1Pick an effect (fade, slide up/down/left/right, zoom in/out, flip, rotate, or blur-in) or start from a preset.
2Choose a technique: CSS scroll-timeline, IntersectionObserver, or Framer whileInView.
3Tune duration, delay, distance, easing, threshold, and stagger; toggle "animate only once" if you do not want it to reverse on scroll back.
4Watch the live preview and hit Replay to re-trigger the reveal after each change.
5Switch the output format and copy, download, or share the generated snippet.

Key Benefits

Covers modern CSS scroll-driven animations and the IntersectionObserver fallback from one config
Ten effects: fade, four slide directions, zoom in/out, flip, rotate, and blur-in
Exports CSS scroll-timeline, vanilla JS, a useScrollReveal React hook, and Framer Motion JSX
Live preview with a Replay button that re-triggers the reveal
Stagger control for cascading list and grid reveals
Every snippet includes a prefers-reduced-motion guard for accessibility
CSS output is wrapped in an @supports guard so older browsers degrade gracefully

Common Use Cases

Adding fade-and-slide reveals to landing page sections as the user scrolls
Building a staggered reveal for a list or card grid
Shipping zero-JavaScript scroll animations with CSS scroll-timeline where support allows
Dropping a battle-tested IntersectionObserver reveal into any site for full browser coverage
Generating a reusable useScrollReveal hook for a React component library

Headline

Scroll-driven reveal

Feature

Fades and moves into view

Card

Staggered after its siblings

Slide up · 700ms · 120ms stagger

Presets

Animation

Effect

Technique

Easing

Timing

Duration700ms

Delay0ms

Distance40px

Threshold0.2

Stagger120ms

Timeline range (view())

Animate only once (don't reverse on scroll back)

Browser support

CSS scroll-driven animations (animation-timeline: view()) ship in Chrome and Edge 115+ and Safari 26+, with Firefox behind a flag. The @supports guard means unsupported browsers simply show the final state — treat it as progressive enhancement.

Output format

CSS scroll-timeline output

Copy, download, share, or pipe to another tool

/* Scroll-driven reveal: Slide up (CSS scroll-timeline) */
.reveal {
  opacity: 1; transform: none; filter: none;
}

@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0; transform: translateY(40px);
      animation: reveal-in linear both;
      animation-timeline: view();
      animation-range: entry 0% cover 40%;
    }
  }
}

@keyframes reveal-in {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: none; filter: none; }
}

Two approaches, one config

Modern CSS scroll-timeline drives the reveal straight from the scroll position with zero JavaScript — wrapped in an @supports guard so older browsers just show the final state. The IntersectionObserver and React hook outputs work everywhere, and Framer Motion gives you orchestration. Every snippet honors prefers-reduced-motion.

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Scroll Animation Helper

How to Use

Key Benefits

Common Use Cases

Two approaches, one config

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