Re: [w3ctag/design-reviews] Scroll-linked Animations (#521)

Given that one of the use cases this API is explicitly designed to enable is parallax scroll effects, which is a [known trigger for vestibular disorders](https://webkit.org/blog/7551/responsive-design-for-motion/#multi), it might be worth considering how this feature integrates with `prefers-reduced-motion`. 

For example, should animations expressed using this API be disabled by default if `prefers-reduced-motion` would match? And if so, could we design a way to allow animations to express that they are safe to be shown for users who prefer reduced motion?

I think it might even be worth opening a broader discussion on what the default behaviour for `prefers-reduced-motion` should be for all web APIs which allow animation, but I think the question is especially critical for this API given it's even more likely than average to cause harm to users.

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