FA-54686 / Accessibility interaction semantics / Open access

Missing semantic objects are mislabeled as unsupported properties · case 01

Missing semantic objects are mislabeled as unsupported properties.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The gone status decision in the property query batch adapter violates its declared contract.

THE FAILURE

The gone status decision in the property query batch adapter violates its declared contract.

Unsuccessful approach: The local repair substitutes results.append(['ok',None]) but still mishandles the regression fixtures.

Case contract

Input [objects,queries,revision,expected_revision]. objects map IDs to [alive,properties]; queries [id,property]. Allowed props name,value,description,role; a missing property is unsupported while an existing None is successful null. Results retain query order and duplicates, each [status,value]; status stale for every query when revisions differ, gone for missing/defunct object, unsupported for unknown/absent property, ok otherwise. Empty queries produce empty output. Return [revision,results], actual revision always. Values are returned as JSON-compatible content; object aliasing is outside this query-only model.

Why this case matters

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

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(data):
    objects,queries,revision,expected = data
    results = []
    for ident,prop in queries:
        if expected != revision: results.append(['stale',None]); continue
        record = objects.get(ident)
        if record is None or not record[0]: results.append(['unsupported',None]); continue
        values = record[1]
        if prop not in {'name','value','description','role'} or prop not in values:
            results.append(['unsupported',None]); continue
        results.append(['ok',values.get(prop)])
    return [revision,results]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('contract fixture 1', solve([{'a':[True,{'name':'A'+str(N),'value':None,'description':'','role':'image'}]},[['a','name'],['a','value'],['a','description'],['a','name']],N,N],), [N,[['ok','A'+str(N)],['ok',None],['ok',''],['ok','A'+str(N)]]])
check('contract fixture 2', solve([{'a':[True,{'secret':'s','name':'A'}]},[['a','secret'],['a','role']],N,N],), [N,[['unsupported',None],['unsupported',None]]])
check('contract fixture 3', solve([{'dead':[False,{'name':'secret'}]},[['missing','name'],['dead','name']],N,N],), [N,[['gone',None],['gone',None]]])
check('contract fixture 4', solve([{'a':[True,{'name':'A'}]},[['a','name'],['missing','role']],N,N-1],), [N,[['stale',None],['stale',None]]])
check('contract fixture 5', solve([{'a':[True,{'name':'A'}]},[['a','name']],N,N+1],), [N,[['stale',None]]])
check('contract fixture 6', solve([{},[],N,N],), [N,[]])
check('contract fixture 7', solve([{'z':[True,{'name':'Z'}],'a':[True,{'name':'A'}]},[['z','name'],['a','name']],N,N],), [N,[['ok','Z'],['ok','A']]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
contract fixture 1	`[1, [['ok', 'A1'], ['ok', None], ['ok', ''], ['ok', 'A1']]]`	`[1, [['ok', 'A1'], ['ok', None], ['ok', ''], ['ok', 'A1']]]`	Passed
contract fixture 2	`[1, [['unsupported', None], ['unsupported', None]]]`	`[1, [['unsupported', None], ['unsupported', None]]]`	Passed
contract fixture 3	`[1, [['unsupported', None], ['unsupported', None]]]`	`[1, [['gone', None], ['gone', None]]]`	Failed
contract fixture 4	`[1, [['stale', None], ['stale', None]]]`	`[1, [['stale', None], ['stale', None]]]`	Passed
contract fixture 5	`[1, [['stale', None]]]`	`[1, [['stale', None]]]`	Passed
contract fixture 6	`[1, []]`	`[1, []]`	Passed
contract fixture 7	`[1, [['ok', 'Z'], ['ok', 'A']]]`	`[1, [['ok', 'Z'], ['ok', 'A']]]`	Passed

SHA-256 / bcd993504a8fd5fdb157541d046c69e69f0e4d457dba834aae8fa3c9eecb50df

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(data):
    objects,queries,revision,expected = data
    results = []
    for ident,prop in queries:
        if expected != revision: results.append(['stale',None]); continue
        record = objects.get(ident)
        if record is None or not record[0]: results.append(['ok',None]); continue
        values = record[1]
        if prop not in {'name','value','description','role'} or prop not in values:
            results.append(['unsupported',None]); continue
        results.append(['ok',values.get(prop)])
    return [revision,results]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('contract fixture 1', solve([{'a':[True,{'name':'A'+str(N),'value':None,'description':'','role':'image'}]},[['a','name'],['a','value'],['a','description'],['a','name']],N,N],), [N,[['ok','A'+str(N)],['ok',None],['ok',''],['ok','A'+str(N)]]])
check('contract fixture 2', solve([{'a':[True,{'secret':'s','name':'A'}]},[['a','secret'],['a','role']],N,N],), [N,[['unsupported',None],['unsupported',None]]])
check('contract fixture 3', solve([{'dead':[False,{'name':'secret'}]},[['missing','name'],['dead','name']],N,N],), [N,[['gone',None],['gone',None]]])
check('contract fixture 4', solve([{'a':[True,{'name':'A'}]},[['a','name'],['missing','role']],N,N-1],), [N,[['stale',None],['stale',None]]])
check('contract fixture 5', solve([{'a':[True,{'name':'A'}]},[['a','name']],N,N+1],), [N,[['stale',None]]])
check('contract fixture 6', solve([{},[],N,N],), [N,[]])
check('contract fixture 7', solve([{'z':[True,{'name':'Z'}],'a':[True,{'name':'A'}]},[['z','name'],['a','name']],N,N],), [N,[['ok','Z'],['ok','A']]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
contract fixture 1	`[1, [['ok', 'A1'], ['ok', None], ['ok', ''], ['ok', 'A1']]]`	`[1, [['ok', 'A1'], ['ok', None], ['ok', ''], ['ok', 'A1']]]`	Passed
contract fixture 2	`[1, [['unsupported', None], ['unsupported', None]]]`	`[1, [['unsupported', None], ['unsupported', None]]]`	Passed
contract fixture 3	`[1, [['ok', None], ['ok', None]]]`	`[1, [['gone', None], ['gone', None]]]`	Failed
contract fixture 4	`[1, [['stale', None], ['stale', None]]]`	`[1, [['stale', None], ['stale', None]]]`	Passed
contract fixture 5	`[1, [['stale', None]]]`	`[1, [['stale', None]]]`	Passed
contract fixture 6	`[1, []]`	`[1, []]`	Passed
contract fixture 7	`[1, [['ok', 'Z'], ['ok', 'A']]]`	`[1, [['ok', 'Z'], ['ok', 'A']]]`	Passed

SHA-256 / 7f7307a88a22272f4f7a994f9cb6cc8bae0c17bb192c070901689371b9ac6903

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Verification & scope

Stipulated finite adapter contract, not a claim of platform accessibility or ARIA conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:45:50.546092+00:00.

Case digest / 3af1d2cc56690de4ea533d1c79a100021af7c83a43077417e3c2f30cfcf885ff