[css-overflow-5] Focus order of generated controls

[w3cbot]

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§ w3c/csswg-drafts#10912

[matatk]

APA discussed on 2024-12-11 and briefly recapped on 2024-12-18.

If we're reading into this specific question correctly, then there seems to be a deeper question about whether custom scrolling is going to work very differently from standard scrolling. With standard scrolling, you just have to be focused on, or in, the scrollable area, and the arrow keys will scroll the area. With this custom method, is the only way to scroll the area to focus and activate one of the buttons?

Have assigned myself and @AutoSponge for now to check this out; other APA volunteers welcomed!