FA-11417 / Accessibility interaction semantics / Member archive

A virtual window reports local positions as global set positions · case 02

The first rendered row is announced as item one even when earlier items are offscreen.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Return [identifier,one_based_position,total] for a contiguous rendered window at zero-based offset. total is the full known dataset size or -1 for unknown; fixtures have valid offsets and known totals large enough for the window. An empty window returns [].

Why this case matters

A controlled offline accessibility-data model. It isolates the stated contract; it does not simulate browser accessibility APIs or claim full ARIA conformance.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
middle window	`[["a", 1, 2], ["b", 2, 2]]`	`[["a", 3, 12], ["b", 4, 12]]`	Failed

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