Re: [csswg-drafts] [css-animations-2] Alternate animation composite order when owning element of A and B differs (#4669)

I think the difficulty is that creation order is not defined for CSS animations/transitions. Not only is the timing of style updates not defined (as [CSS transitions points out](https://drafts.csswg.org/css-transitions/#starting)) leading to potential differences due to differences in batching of updates, even when the timing is the same, I don't believe there is any requirement on UAs to create the animations/transitions in any particular order (thus allowing them to process subtrees in parallel etc.).

Unfortunately I think the order of `getAnimations` is pretty important (since authors will almost certainly do things like `document.getAnimations()[2]`) so I think those differences are significant.

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Received on Tuesday, 14 January 2020 02:09:37 UTC