Scroll-linked Animations 2022-11-18

[fantasai]

• name of spec to be reviewed: Scroll-linked Animations

• URL of spec: https://www.w3.org/TR/scroll-animations-1/

• Do you need a reply by a particular date? No

• Please point to the results of your own self-review See comments below

• Where and how to file issues arising? https://github.com/w3c/csswg-drafts/issues tagged [scroll-animations-1]

• Pointer to any explainer for the spec?

Other comments:

A number of JS libraries provide for scroll-linked animations, i.e. animations that are tied to the scroll position rather than to time. (These should be distinguished from scroll-triggered animations, which are time-based animations that are triggered by a particular scroll position.) This CSS module provides both a standard API extending the Web Animations API, as well as declarative methods using CSS properties, to create such animations. From an a11y point of view, this module makes it a lot easier to create such animations; but also makes it possible for the UA to interfere with them if necessary.

For an a11y review of this draft, I think reading the introductory sections and merely skimming the rest of the API definitions should be enough to identify any accessibility issues.

There's some ongoing discussion about animations and accessibility that's also relevant here.

Thanks~