FA-54176 / Accessibility interaction semantics / Open access

Annotation endpoints extend beyond accessible text · case 01

Annotation endpoints extend beyond accessible text.

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

ROOT CAUSE

The annotation right decision in the annotation ranges adapter violates its declared contract.

THE FAILURE

The annotation right decision in the annotation ranges adapter violates its declared contract.

Unsuccessful approach: The local repair substitutes min(length+1,end) but still mishandles the regression fixtures.

Case contract

Input [length,annotations,types] annotations [id,start,end,kind,detail,resolved]. Admit allowed types and unresolved annotations with nonempty detail. Clamp half-open ranges, discard empty or reversed. Preserve overlapping annotations; dedupe same ID by first eligible record. Output sorted by start,end,ID. Return [id,start,end,kind,detail]. Spelling, grammar, comment are the only recognized kinds even if types requests unknown types.

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):
    length,annotations,types = data
    seen = set()
    result = []
    for ident,start,end,kind,detail,resolved in annotations:
        if kind not in {'spelling','grammar','comment'} or kind not in types: continue
        if resolved or not detail: continue
        start,end = max(0,start),end
        if start >= end or ident in seen: continue
        seen.add(ident)
        result.append([ident,start,end,kind,detail])
    return sorted(result,key=lambda row:(row[1],row[2],row[0]))
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('contract fixture 1', solve([N+5,[['b',N,N+3,'comment','B',False],['a',N,N+2,'spelling','A',False],['c',N,N+2,'grammar','C',False]],['comment','spelling','grammar']],), [['a',N,N+2,'spelling','A'],['c',N,N+2,'grammar','C'],['b',N,N+3,'comment','B']])
check('contract fixture 2', solve([4,[['a',-2,2,'comment','A',False],['b',2,8,'comment','B',False]],['comment']],), [['a',0,2,'comment','A'],['b',2,4,'comment','B']])
check('contract fixture 3', solve([4,[['a',0,2,'comment','A',True],['b',0,2,'spelling','B',False],['c',0,2,'unknown','C',False],['d',0,2,'comment','',False]],['comment','unknown']],), [])
check('contract fixture 4', solve([4,[['a',0,0,'comment','zero',False],['b',3,1,'comment','reverse',False]],['comment']],), [])
check('contract fixture 5', solve([4,[['a',2,3,'comment','first',False],['a',0,1,'comment','later',False]],['comment']],), [['a',2,3,'comment','first']])
check('contract fixture 6', solve([4,[['a',0,2,'comment','resolved',True],['a',1,3,'comment','live',False]],['comment']],), [['a',1,3,'comment','live']])
check('contract fixture 7', solve([0,[],[]],), [])
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	`[['a', 1, 3, 'spelling', 'A'], ['c', 1, 3, 'grammar', 'C'], ['b', 1, 4, 'comment', 'B']]`	`[['a', 1, 3, 'spelling', 'A'], ['c', 1, 3, 'grammar', 'C'], ['b', 1, 4, 'comment', 'B']]`	Passed
contract fixture 2	`[['a', 0, 2, 'comment', 'A'], ['b', 2, 8, 'comment', 'B']]`	`[['a', 0, 2, 'comment', 'A'], ['b', 2, 4, 'comment', 'B']]`	Failed
contract fixture 3	`[]`	`[]`	Passed
contract fixture 4	`[]`	`[]`	Passed
contract fixture 5	`[['a', 2, 3, 'comment', 'first']]`	`[['a', 2, 3, 'comment', 'first']]`	Passed
contract fixture 6	`[['a', 1, 3, 'comment', 'live']]`	`[['a', 1, 3, 'comment', 'live']]`	Passed
contract fixture 7	`[]`	`[]`	Passed

SHA-256 / 07b35db147ce0f69d9d9068fe9372a336f02deae0ba4abe4d6118d97d0f3e1f9

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(data):
    length,annotations,types = data
    seen = set()
    result = []
    for ident,start,end,kind,detail,resolved in annotations:
        if kind not in {'spelling','grammar','comment'} or kind not in types: continue
        if resolved or not detail: continue
        start,end = max(0,start),min(length+1,end)
        if start >= end or ident in seen: continue
        seen.add(ident)
        result.append([ident,start,end,kind,detail])
    return sorted(result,key=lambda row:(row[1],row[2],row[0]))
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('contract fixture 1', solve([N+5,[['b',N,N+3,'comment','B',False],['a',N,N+2,'spelling','A',False],['c',N,N+2,'grammar','C',False]],['comment','spelling','grammar']],), [['a',N,N+2,'spelling','A'],['c',N,N+2,'grammar','C'],['b',N,N+3,'comment','B']])
check('contract fixture 2', solve([4,[['a',-2,2,'comment','A',False],['b',2,8,'comment','B',False]],['comment']],), [['a',0,2,'comment','A'],['b',2,4,'comment','B']])
check('contract fixture 3', solve([4,[['a',0,2,'comment','A',True],['b',0,2,'spelling','B',False],['c',0,2,'unknown','C',False],['d',0,2,'comment','',False]],['comment','unknown']],), [])
check('contract fixture 4', solve([4,[['a',0,0,'comment','zero',False],['b',3,1,'comment','reverse',False]],['comment']],), [])
check('contract fixture 5', solve([4,[['a',2,3,'comment','first',False],['a',0,1,'comment','later',False]],['comment']],), [['a',2,3,'comment','first']])
check('contract fixture 6', solve([4,[['a',0,2,'comment','resolved',True],['a',1,3,'comment','live',False]],['comment']],), [['a',1,3,'comment','live']])
check('contract fixture 7', solve([0,[],[]],), [])
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	`[['a', 1, 3, 'spelling', 'A'], ['c', 1, 3, 'grammar', 'C'], ['b', 1, 4, 'comment', 'B']]`	`[['a', 1, 3, 'spelling', 'A'], ['c', 1, 3, 'grammar', 'C'], ['b', 1, 4, 'comment', 'B']]`	Passed
contract fixture 2	`[['a', 0, 2, 'comment', 'A'], ['b', 2, 5, 'comment', 'B']]`	`[['a', 0, 2, 'comment', 'A'], ['b', 2, 4, 'comment', 'B']]`	Failed
contract fixture 3	`[]`	`[]`	Passed
contract fixture 4	`[]`	`[]`	Passed
contract fixture 5	`[['a', 2, 3, 'comment', 'first']]`	`[['a', 2, 3, 'comment', 'first']]`	Passed
contract fixture 6	`[['a', 1, 3, 'comment', 'live']]`	`[['a', 1, 3, 'comment', 'live']]`	Passed
contract fixture 7	`[]`	`[]`	Passed

SHA-256 / cce32a479fd5c8c8438ed43ea6278ab5bf0e8f104866115cdd635922cb5dc17e

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 2026-09-29T14:45:45.976741+00:00.

Case digest / d7980e48ea9e7de3d867a6b8d6d28b85cf959f61f0803cac4a3fe2a0e57d3a0a