Re: [csswg-drafts] [scroll-animations] End < Start offset can cause the ScrollTimeline to produce negative time (#4351)

Sorting solves the problem for [container based offsets](https://drafts.csswg.org/scroll-animations/#container-based-offset-section). If offsets are [element based](https://drafts.csswg.org/scroll-animations/#element-based-offset-section), the elements can be rearranged within the scroller post sorting and, as a result, produce negative time.

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