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Hierarchical checkbox cascade: Indeterminate parent state is serialized as unchecked · case 02
Indeterminate parent state is serialized as unchecked produces the wrong hierarchical widget state in a regression fixture.
Case contract
Descendants and leaves are supplied for one branch, without cycles. Toggle writable leaves only. Preserve disabled and unrelated checks; derive parent state from writable leaves; unknown children force mixed unless no leaves are checked.
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 |
|---|---|---|---|
| all checked | [["outside", "c1"], "mixed", ["c0", "c2", "c3"], false] | [["outside", "c1"], "false", ["c0", "c2", "c3"], false] | Failed |
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