FA-53967 / Accessibility interaction semantics / Member archive

Patch updates alter stable accessibility object identifiers · case 02

Patch updates alter stable accessibility object identifiers.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Input [initial,revision,updates]. Updates [base_revision,next_revision,changes] apply atomically only if base matches current and next is greater; updates cannot change immutable id or role. Allowed dynamic keys name,description,value,help,language; unknown keys reject whole update. None deletes a property, empty string is retained; values must be strings or None. Return [state,revision,accepted_flags]. Copy initial. Revision advances even for no-op changes.

Why this case matters

Offline accessibility bridge model with explicit policy; useful for testing semantic API adapters independently of browser implementations.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
contract fixture 3	`[{"id": "y", "role": "image"}, 3, [true, false]]`	`[{"id": "x", "role": "image"}, 2, [false, false]]`	Failed

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