A rail that does not drift

Steps

1. 1 Guest The home rail 0:09 ▣

   Plan 52 built it, plan 84 made it swipe-first, plan 89 filled it. Everything below is arithmetic and timing inside that.

2. 2 Guest Travel past the loop seam, twice 0:14 ▣

   Sixteen pages of travel through the wrap. Every rest lands flush — the grid is anchored to where the rail IS, not to index 0.

3. 3 Guest The moment it loops, nothing happens 0:24 ▣

   This is the defect you could SEE: scrollLeft was assigned while smooth scrolling was live, so Chrome animated the wrap across the whole clone buffer.

4. 4 Guest Tap page 3 0:25 ▣

   The owner's 'jumps to the next few events', made visible — and found broken here, not in the tests: scroll-snap-stop forbids a programmatic scroll passing a snap point, so every dot moved exactly one page.

5. 5 Guest Scroll a mouse wheel over it 0:28 ▣

   A vertical wheel over a horizontal container is ignored by every engine, so a desktop mouse user's only paths were drag and the arrows. At the ends the page keeps its own scroll — never swallowed.

Notes

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Run history (6)

• 20260830T213639Z-3499cea — passed · 3499cea
• 20260830T182912Z-77584d6 — passed · 77584d6
• 20260830T180118Z-bd2e5e8 — passed · bd2e5e8
• 20260830T175010Z-7720b19 — passed · 7720b19
• 20260830T170145Z-b690bff — passed · b690bff
• 20260826T040827Z-eadc380 — passed · eadc380