Re: [w3ctag/design-reviews] WG New Spec: Scroll-Triggered Animations (Issue #1167)

matatk left a comment (w3ctag/design-reviews#1167)

Hi @DavMila, thanks for your helpful feedback, and sorry for the slow reply.

We have a couple of questions; starting with the more specific...

1. Regarding the use of `contain` and `cover`: we think this is going to cause developer confusion - whilst re-using syntax is generally a good thing, it seems that the meaning of the keywords here diverges from how they're used in CSS in general. Has the group discussed alternative names - if they were rejected, could you point us to the rationale?

2. Should the UA have some control over the speed of these animations in particular? Regarding the issue that they could be distracting for people, or simply happen too fast for some people to process (both of these could affect anyone who is distracted, or has specific cognitive disabilities).

   As these are a 'new' type of animation (from the spec's perspective), perhaps there's an opportunity to consider whether we could give more agency to the UA in how they are rendered?

   Specifically, if there's an opportunity here to make steps towards [giving users more control over motion](https://github.com/w3ctag/gaps/issues/15), it would be good to do so.

With respect to your [proposed accessibility considerations section](https://github.com/w3c/csswg-drafts/pull/13243/changes), this looks great so far; thanks. APA WG started drafting one, but since I saw you had been working on this, and it covers much of what APA wanted to say, we paused that, and will check it out when the PR is merged.

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