# flackr/scroll-timeline

A polyfill of ScrollTimeline.

Repository: https://github.com/flackr/scroll-timeline
Canonical: https://ross.abutalabs.com/products/scroll-timeline
Language: JavaScript
License: Apache-2.0
License Family: permissive
Last push: 2024-08-26T15:21:30+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 2560, "days_push": 737, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1163, forks 112 (observed 2026-08-28T04:03:49.769296+00:00)

## What it is
A JavaScript polyfill implementing the ScrollTimeline and ViewTimeline APIs from the CSS scroll-driven animations spec. It lets developers create scroll-linked animations in browsers that lack native support, via both the Web Animations API and CSS animation-timeline properties.

## Use cases
- add parallax scrolling effects to a website
- animate elements as the user scrolls down the page
- use scroll-timeline CSS animations in browsers without native support
- create scroll-driven progress bars or reveal animations
- polyfill view-timeline for cross-browser scroll animations

## When to choose
- you need scroll-driven animations working in browsers without native ScrollTimeline support
- you want to write scroll animations using standard spec syntax today
- you need both JS API and CSS animation-timeline polyfilling

## When to avoid
- your target browsers natively support scroll-driven animations
- you need non-scroll-based animation timelines
- your CSS is loaded cross-origin, which the polyfill cannot process

## Facets
- artifact type: library
- maturity: active
- function: animation, ui-components
- domain: web-development, frontend
- platform: browser
- tags: polyfill, scroll-driven-animations, scroll-timeline, view-timeline, web-animations-api, css, web-server

## Member repositories
- flackr/scroll-timeline (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:49.769296+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:31:33.943703+00:00, confidence not recorded.
  - readme: https://github.com/flackr/scroll-timeline (fetched 2026-08-28T04:03:49.769296+00:00, sha 1b8e8111d2fc)
- Data as of 2026-08-30T08:39:29.467469+00:00.