ハウディTAG！

I'm requesting a TAG review of:

• Name: Scroll-linked Animations
• Specification URL: https://wicg.github.io/scroll-animations/
• Explainer, Requirements Doc, or Example code: None, please add a comment if the Specification does not suffice
• Tests: https://chromium.googlesource.com/chromium/src/+/da87860cb19a14c6bc35720bdff3355b84f64407/third_party/blink/web_tests/fast/animation/scroll-animations (in progress of being upstreamed to WPT); https://github.com/web-platform-tests/wpt/tree/master/scroll-animations
• Primary contacts: stephenmcgruer

Further details (optional):

• Relevant time constraints or deadlines: [please provide]
• I have read and filled out the Self-Review Questionnare on Security and Privacy. The assessment is here.
• I have reviewed the TAG's API Design Principles

You should also know that...

This feature is currently partially implemented in chromium, hidden behind a flag:

--enable-blink-features=AnimationWorklet

The focus of the implementation was to get something working for Animation Worklet. As such:

1. At the time of writing, it does not work for Web Animations.
2. At the time of writing, the CSS sections of the spec have not been implemented

Some demos can be found at https://scrolltimeline-playground.glitch.me/ . An additional very quickly thrown together demo can be found at https://output.jsbin.com/vezohun/quiet

We'd prefer the TAG provide feedback as (please select one):

• open issues in our Github repo for each point of feedback: https://github.com/WICG/scroll-animations
• open a single issue in our Github repo for the entire review
• leave review feedback as a comment in this issue and @-notify [github usernames]