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Tree accessibility snapshot consistency audit: Collapsed leaf expansion attribute escapes audit · case 04

Collapsed leaf expansion attribute escapes audit produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 4 · 3 implementations · 14 checks per implementation

Case contract

Validate a bounded already-resolved widget snapshot. IDs are unique; each row has positive level, positive position no greater than a known set size, a live parent at prior level, leaves omit expansion, and the single active ID must be exposed. Selected IDs must be selectable; busy leaf rows are invalid. Return ordered error codes.

Why this case matters

Offline executable model of a hierarchical accessibility interaction; inputs are bounded and valid as stipulated. No browser, assistive technology, or normative ARIA conformance is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
leaf expanded false	`[]`	`["leaf-expanded"]`	Failed

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