FA-39504 / Tree accessibility / Member archive
Exclusive sibling branch expansion: Exclusive closure runs when option is off or target rejected · case 04
Exclusive closure runs when option is off or target rejected produces the wrong hierarchical widget state in a regression fixture.
Case contract
Expanding a branch in exclusive mode closes its sibling branches and their descendants, but leaves ancestor and unrelated branch expansion intact. Expansion of disabled or leaf nodes is ignored. Focus within a newly closed sibling moves to that sibling root. Manual expansion survives later mode-off operation. Report whether pre-operation focus was a terminal row as provenance.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| mode off | [["a", "q", "r"], "b", ["a", "b", "bb"], {"a": true, "b": false, "bb": false, "q": true, "r": true}, true] | [["a", "b", "bb", "q", "r"], "c", ["a"], {"a": true, "b": true, "bb": true, "q": true, "r": true}, true] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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