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CSS Tools

Scroll-Driven Animation Generator

Build scroll() and view() timeline animations. Create reading progress bars, fade-in-on-scroll effects, parallax sections, and scroll-linked background animations without JavaScript.

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What is Scroll-Driven Animation Generator?

Scroll-driven animations use the scroll position or viewport position of an element as the animation timeline instead of time. The scroll() function tracks the scroll container position, and the view() function tracks an element's position in the viewport. This enables reading progress bars, reveal effects, and scroll-linked animations with pure CSS.

Quick answer

Scroll-driven animations let you link an animation progress directly to the scroll position of a container, eliminating the need for scroll event listeners and JavaScript-based parallax libraries.

Limitations

  • Chrome 115+ and Edge 115+ support scroll-driven animations. Firefox and Safari do not yet support the ScrollTimeline API.
  • Scroll-driven animations use the Web Animations API. CSS @keyframes are still required for defining animation states.
  • Scroll() and view() timing progress is determined by scroll distance. Animations may behave differently on very short or very long content.

How to use this tool

  1. Choose the timeline type: scroll (tracks scroll container) or view (tracks element position in viewport).
  2. Set the animation range and keyframes for the desired effect.
  3. The tool generates the CSS for the animated element.
  4. Copy the CSS and test on a scrollable page to verify the animation.

What you can use it for

  • Create a reading progress bar at the top of a blog post.
  • Build fade-in or slide-up reveal effects as sections scroll into view.
  • Add a parallax or scroll-linked background animation to a page.

Use cases

Practical examples

Example

Blog reading progress bar

A blog post shows a horizontal progress bar that fills as the reader scrolls, using animation-timeline: scroll() on the article container.

Example

Scroll-triggered section reveals

Sections fade in as they enter the viewport using animation-timeline: view() with a custom range starting at 0% and ending at 50% of the element's visibility.

Common mistakes

  • Creating animations that trigger too frequently and hurt scroll performance.
  • Not testing on mobile where scroll behavior differs from desktop.
  • Using scroll-driven animations for critical content without a static fallback.

Verification

  1. Test the animation in Chrome and verify the element animates smoothly as the page scrolls.
  2. Check the animation in Firefox and Safari to confirm it degrades gracefully without breaking page layout or functionality.

FAQ

Questions about Scroll-Driven Animation Generator

Which browsers support scroll-driven animations?

Chrome 115+, Edge 115+. Safari and Firefox are developing support. Provide a static fallback.

What is the difference between scroll() and view()?

Scroll() tracks the scroll position of a container. View() tracks the position of the element relative to the viewport.

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