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 review request.

We appreciate this is an increasingly used pattern, and it's important to help authors to get it right. On those lines, we have several concerns:

* The robustness of this pattern on sites in general - e.g. when afforded by scripting - can be poor. For example: triggers firing the wrong number of times; things going wrong if the user scrolls back. Have you considered how these issues may be resolved through standardization?

* Historically, all page content was loaded in and was available to ATs - it might just be off screen, but could be explored. If content is loaded dynamically in response to scrolling, this could exclude some users. (It doesn't seem like that's _inherent_ here, but it seems like a pattern that may more prominently emerge following this.)

* Scrolling and animation can cause huge cognitive issues (e.g. distracting, disorienting). We have `prefers-reduced-motion` but we're not sure how much consideration has been given to providing guidance for authors on how to ensure an equitable UX - especially in cases of complex animations revealing - or even themselves acting as - content.

* Does this interact with/affect the focus in any way?

There seems to be justification for an 'accessibility considerations' section, assuming ways to address these concerns are known, or could be found. APA WG would be happy to help by reviewing any content you might create for such a section.

We look forward to hearing your thoughts on the above.

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