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FA-24126 / Client state / Open access

Page freeze and resume lifecycle: Resume event source · case 01

Resume event source.

Verified by executionVariant 1 · 60 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The resume-event-source client decision evaluates `'bfcache' if persisted else 'ordinary'` instead of `'bfcache' if event=='pageshow' and persisted else ('thaw' if event=='resume' else 'ordinary')`.

THE FAILURE

The resume-event-source client decision evaluates `'bfcache' if persisted else 'ordinary'` instead of `'bfcache' if event=='pageshow' and persisted else ('thaw' if event=='resume' else 'ordinary')`.

Unsuccessful approach: The partial repair `'thaw' if event in ('resume','pageshow') else 'ordinary'` still violates the explicit fixture contract.

Case contract

The stipulated page lifecycle distinguishes a cached pagehide from final disposal. Timers pause on hide/freeze, dirty snapshots flush on any pagehide, and resume/pageshow may revalidate and drain retained work. Operation resume-event-source has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(operation, s):
    event, persisted, dirty, active, queued, revision, observed = s
    if operation == 'preserved-page-disposition':
        return 'suspend' if event=='pagehide' and persisted else ('dispose' if event=='pagehide' else 'keep')
    if operation == 'resume-revalidation':
        return event in ('resume','pageshow') and (persisted or revision!=observed)
    if operation == 'freeze-timer-shutdown':
        return [x for x in active if x!='timer'] if event in ('freeze','pagehide') else active
    if operation == 'dirty-pagehide-flush':
        return dirty and event=='pagehide'
    if operation == 'preserved-client-queue':
        return queued if persisted or event!='pagehide' else []
    if operation == 'resume-queue-drain':
        return queued if event in ('resume','pageshow') else []
    if operation == 'resume-event-source':
        return 'bfcache' if persisted else 'ordinary'
    if operation == 'resource-disposal-on-unload':
        return active if event=='pagehide' and not persisted else []
    if operation == 'suspended-work-reason':
        return 'frozen' if event=='freeze' else ('cached' if event=='pagehide' and persisted else None)
    if operation == 'revalidation-observed-version':
        return revision if event in ('resume','pageshow') else observed
    raise ValueError('unknown modeled operation')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('preserved-page-disposition scenario 1', solve('preserved-page-disposition', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'suspend')
check('preserved-page-disposition scenario 2', solve('preserved-page-disposition', ('pagehide',False,True,['timer'],[],1,1)), 'dispose')
check('preserved-page-disposition scenario 3', solve('preserved-page-disposition', ('pageshow',True,False,[],['a','b'],3,1)), 'keep')
check('preserved-page-disposition scenario 4', solve('preserved-page-disposition', ('pageshow',False,False,[],[],1,1)), 'keep')
check('preserved-page-disposition scenario 5', solve('preserved-page-disposition', ('freeze',False,True,['socket'],['a'],2,2)), 'keep')
check('preserved-page-disposition scenario 6', solve('preserved-page-disposition', ('resume',False,True,['timer'],['a'],2,3)), 'keep')
check('resume-revalidation scenario 1', solve('resume-revalidation', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), False)
check('resume-revalidation scenario 2', solve('resume-revalidation', ('pagehide',False,True,['timer'],[],1,1)), False)
check('resume-revalidation scenario 3', solve('resume-revalidation', ('pageshow',True,False,[],['a','b'],3,1)), True)
check('resume-revalidation scenario 4', solve('resume-revalidation', ('pageshow',False,False,[],[],1,1)), False)
check('resume-revalidation scenario 5', solve('resume-revalidation', ('freeze',False,True,['socket'],['a'],2,2)), False)
check('resume-revalidation scenario 6', solve('resume-revalidation', ('resume',False,True,['timer'],['a'],2,3)), True)
check('freeze-timer-shutdown scenario 1', solve('freeze-timer-shutdown', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), ['socket'])
check('freeze-timer-shutdown scenario 2', solve('freeze-timer-shutdown', ('pagehide',False,True,['timer'],[],1,1)), [])
check('freeze-timer-shutdown scenario 3', solve('freeze-timer-shutdown', ('pageshow',True,False,[],['a','b'],3,1)), [])
check('freeze-timer-shutdown scenario 4', solve('freeze-timer-shutdown', ('pageshow',False,False,[],[],1,1)), [])
check('freeze-timer-shutdown scenario 5', solve('freeze-timer-shutdown', ('freeze',False,True,['socket'],['a'],2,2)), ['socket'])
check('freeze-timer-shutdown scenario 6', solve('freeze-timer-shutdown', ('resume',False,True,['timer'],['a'],2,3)), ['timer'])
check('dirty-pagehide-flush scenario 1', solve('dirty-pagehide-flush', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), True)
check('dirty-pagehide-flush scenario 2', solve('dirty-pagehide-flush', ('pagehide',False,True,['timer'],[],1,1)), True)
check('dirty-pagehide-flush scenario 3', solve('dirty-pagehide-flush', ('pageshow',True,False,[],['a','b'],3,1)), False)
check('dirty-pagehide-flush scenario 4', solve('dirty-pagehide-flush', ('pageshow',False,False,[],[],1,1)), False)
check('dirty-pagehide-flush scenario 5', solve('dirty-pagehide-flush', ('freeze',False,True,['socket'],['a'],2,2)), False)
check('dirty-pagehide-flush scenario 6', solve('dirty-pagehide-flush', ('resume',False,True,['timer'],['a'],2,3)), False)
check('preserved-client-queue scenario 1', solve('preserved-client-queue', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), ['a']*N)
check('preserved-client-queue scenario 2', solve('preserved-client-queue', ('pagehide',False,True,['timer'],[],1,1)), [])
check('preserved-client-queue scenario 3', solve('preserved-client-queue', ('pageshow',True,False,[],['a','b'],3,1)), ['a','b'])
check('preserved-client-queue scenario 4', solve('preserved-client-queue', ('pageshow',False,False,[],[],1,1)), [])
check('preserved-client-queue scenario 5', solve('preserved-client-queue', ('freeze',False,True,['socket'],['a'],2,2)), ['a'])
check('preserved-client-queue scenario 6', solve('preserved-client-queue', ('resume',False,True,['timer'],['a'],2,3)), ['a'])
check('resume-queue-drain scenario 1', solve('resume-queue-drain', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), [])
check('resume-queue-drain scenario 2', solve('resume-queue-drain', ('pagehide',False,True,['timer'],[],1,1)), [])
check('resume-queue-drain scenario 3', solve('resume-queue-drain', ('pageshow',True,False,[],['a','b'],3,1)), ['a','b'])
check('resume-queue-drain scenario 4', solve('resume-queue-drain', ('pageshow',False,False,[],[],1,1)), [])
check('resume-queue-drain scenario 5', solve('resume-queue-drain', ('freeze',False,True,['socket'],['a'],2,2)), [])
check('resume-queue-drain scenario 6', solve('resume-queue-drain', ('resume',False,True,['timer'],['a'],2,3)), ['a'])
check('resume-event-source scenario 1', solve('resume-event-source', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'ordinary')
check('resume-event-source scenario 2', solve('resume-event-source', ('pagehide',False,True,['timer'],[],1,1)), 'ordinary')
check('resume-event-source scenario 3', solve('resume-event-source', ('pageshow',True,False,[],['a','b'],3,1)), 'bfcache')
check('resume-event-source scenario 4', solve('resume-event-source', ('pageshow',False,False,[],[],1,1)), 'ordinary')
check('resume-event-source scenario 5', solve('resume-event-source', ('freeze',False,True,['socket'],['a'],2,2)), 'ordinary')
check('resume-event-source scenario 6', solve('resume-event-source', ('resume',False,True,['timer'],['a'],2,3)), 'thaw')
check('resource-disposal-on-unload scenario 1', solve('resource-disposal-on-unload', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), [])
check('resource-disposal-on-unload scenario 2', solve('resource-disposal-on-unload', ('pagehide',False,True,['timer'],[],1,1)), ['timer'])
check('resource-disposal-on-unload scenario 3', solve('resource-disposal-on-unload', ('pageshow',True,False,[],['a','b'],3,1)), [])
check('resource-disposal-on-unload scenario 4', solve('resource-disposal-on-unload', ('pageshow',False,False,[],[],1,1)), [])
check('resource-disposal-on-unload scenario 5', solve('resource-disposal-on-unload', ('freeze',False,True,['socket'],['a'],2,2)), [])
check('resource-disposal-on-unload scenario 6', solve('resource-disposal-on-unload', ('resume',False,True,['timer'],['a'],2,3)), [])
check('suspended-work-reason scenario 1', solve('suspended-work-reason', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'cached')
check('suspended-work-reason scenario 2', solve('suspended-work-reason', ('pagehide',False,True,['timer'],[],1,1)), None)
check('suspended-work-reason scenario 3', solve('suspended-work-reason', ('pageshow',True,False,[],['a','b'],3,1)), None)
check('suspended-work-reason scenario 4', solve('suspended-work-reason', ('pageshow',False,False,[],[],1,1)), None)
check('suspended-work-reason scenario 5', solve('suspended-work-reason', ('freeze',False,True,['socket'],['a'],2,2)), 'frozen')
check('suspended-work-reason scenario 6', solve('suspended-work-reason', ('resume',False,True,['timer'],['a'],2,3)), None)
check('revalidation-observed-version scenario 1', solve('revalidation-observed-version', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 2)
check('revalidation-observed-version scenario 2', solve('revalidation-observed-version', ('pagehide',False,True,['timer'],[],1,1)), 1)
check('revalidation-observed-version scenario 3', solve('revalidation-observed-version', ('pageshow',True,False,[],['a','b'],3,1)), 3)
check('revalidation-observed-version scenario 4', solve('revalidation-observed-version', ('pageshow',False,False,[],[],1,1)), 1)
check('revalidation-observed-version scenario 5', solve('revalidation-observed-version', ('freeze',False,True,['socket'],['a'],2,2)), 2)
check('revalidation-observed-version scenario 6', solve('revalidation-observed-version', ('resume',False,True,['timer'],['a'],2,3)), 2)
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 fixtureActualExpectedOutcome
preserved-page-disposition scenario 1suspendsuspendPassed
preserved-page-disposition scenario 2disposedisposePassed
preserved-page-disposition scenario 3keepkeepPassed
preserved-page-disposition scenario 4keepkeepPassed
preserved-page-disposition scenario 5keepkeepPassed
preserved-page-disposition scenario 6keepkeepPassed
resume-revalidation scenario 1FalseFalsePassed
resume-revalidation scenario 2FalseFalsePassed
resume-revalidation scenario 3TrueTruePassed
resume-revalidation scenario 4FalseFalsePassed
resume-revalidation scenario 5FalseFalsePassed
resume-revalidation scenario 6TrueTruePassed
freeze-timer-shutdown scenario 1['socket']['socket']Passed
freeze-timer-shutdown scenario 2[][]Passed
freeze-timer-shutdown scenario 3[][]Passed
freeze-timer-shutdown scenario 4[][]Passed
freeze-timer-shutdown scenario 5['socket']['socket']Passed
freeze-timer-shutdown scenario 6['timer']['timer']Passed
dirty-pagehide-flush scenario 1TrueTruePassed
dirty-pagehide-flush scenario 2TrueTruePassed
dirty-pagehide-flush scenario 3FalseFalsePassed
dirty-pagehide-flush scenario 4FalseFalsePassed
dirty-pagehide-flush scenario 5FalseFalsePassed
dirty-pagehide-flush scenario 6FalseFalsePassed
preserved-client-queue scenario 1['a']['a']Passed
preserved-client-queue scenario 2[][]Passed
preserved-client-queue scenario 3['a', 'b']['a', 'b']Passed
preserved-client-queue scenario 4[][]Passed
preserved-client-queue scenario 5['a']['a']Passed
preserved-client-queue scenario 6['a']['a']Passed
resume-queue-drain scenario 1[][]Passed
resume-queue-drain scenario 2[][]Passed
resume-queue-drain scenario 3['a', 'b']['a', 'b']Passed
resume-queue-drain scenario 4[][]Passed
resume-queue-drain scenario 5[][]Passed
resume-queue-drain scenario 6['a']['a']Passed
resume-event-source scenario 1bfcacheordinaryFailed
resume-event-source scenario 2ordinaryordinaryPassed
resume-event-source scenario 3bfcachebfcachePassed
resume-event-source scenario 4ordinaryordinaryPassed
resume-event-source scenario 5ordinaryordinaryPassed
resume-event-source scenario 6ordinarythawFailed
resource-disposal-on-unload scenario 1[][]Passed
resource-disposal-on-unload scenario 2['timer']['timer']Passed
resource-disposal-on-unload scenario 3[][]Passed
resource-disposal-on-unload scenario 4[][]Passed
resource-disposal-on-unload scenario 5[][]Passed
resource-disposal-on-unload scenario 6[][]Passed
suspended-work-reason scenario 1cachedcachedPassed
suspended-work-reason scenario 2NoneNonePassed
suspended-work-reason scenario 3NoneNonePassed
suspended-work-reason scenario 4NoneNonePassed
suspended-work-reason scenario 5frozenfrozenPassed
suspended-work-reason scenario 6NoneNonePassed
revalidation-observed-version scenario 122Passed
revalidation-observed-version scenario 211Passed
revalidation-observed-version scenario 333Passed
revalidation-observed-version scenario 411Passed
revalidation-observed-version scenario 522Passed
revalidation-observed-version scenario 622Passed

SHA-256 / 1b7f27e98371479933a0df4560eaebcc63000948a234712302fb83e0bfd8a306

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(operation, s):
    event, persisted, dirty, active, queued, revision, observed = s
    if operation == 'preserved-page-disposition':
        return 'suspend' if event=='pagehide' and persisted else ('dispose' if event=='pagehide' else 'keep')
    if operation == 'resume-revalidation':
        return event in ('resume','pageshow') and (persisted or revision!=observed)
    if operation == 'freeze-timer-shutdown':
        return [x for x in active if x!='timer'] if event in ('freeze','pagehide') else active
    if operation == 'dirty-pagehide-flush':
        return dirty and event=='pagehide'
    if operation == 'preserved-client-queue':
        return queued if persisted or event!='pagehide' else []
    if operation == 'resume-queue-drain':
        return queued if event in ('resume','pageshow') else []
    if operation == 'resume-event-source':
        return 'thaw' if event in ('resume','pageshow') else 'ordinary'
    if operation == 'resource-disposal-on-unload':
        return active if event=='pagehide' and not persisted else []
    if operation == 'suspended-work-reason':
        return 'frozen' if event=='freeze' else ('cached' if event=='pagehide' and persisted else None)
    if operation == 'revalidation-observed-version':
        return revision if event in ('resume','pageshow') else observed
    raise ValueError('unknown modeled operation')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('preserved-page-disposition scenario 1', solve('preserved-page-disposition', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'suspend')
check('preserved-page-disposition scenario 2', solve('preserved-page-disposition', ('pagehide',False,True,['timer'],[],1,1)), 'dispose')
check('preserved-page-disposition scenario 3', solve('preserved-page-disposition', ('pageshow',True,False,[],['a','b'],3,1)), 'keep')
check('preserved-page-disposition scenario 4', solve('preserved-page-disposition', ('pageshow',False,False,[],[],1,1)), 'keep')
check('preserved-page-disposition scenario 5', solve('preserved-page-disposition', ('freeze',False,True,['socket'],['a'],2,2)), 'keep')
check('preserved-page-disposition scenario 6', solve('preserved-page-disposition', ('resume',False,True,['timer'],['a'],2,3)), 'keep')
check('resume-revalidation scenario 1', solve('resume-revalidation', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), False)
check('resume-revalidation scenario 2', solve('resume-revalidation', ('pagehide',False,True,['timer'],[],1,1)), False)
check('resume-revalidation scenario 3', solve('resume-revalidation', ('pageshow',True,False,[],['a','b'],3,1)), True)
check('resume-revalidation scenario 4', solve('resume-revalidation', ('pageshow',False,False,[],[],1,1)), False)
check('resume-revalidation scenario 5', solve('resume-revalidation', ('freeze',False,True,['socket'],['a'],2,2)), False)
check('resume-revalidation scenario 6', solve('resume-revalidation', ('resume',False,True,['timer'],['a'],2,3)), True)
check('freeze-timer-shutdown scenario 1', solve('freeze-timer-shutdown', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), ['socket'])
check('freeze-timer-shutdown scenario 2', solve('freeze-timer-shutdown', ('pagehide',False,True,['timer'],[],1,1)), [])
check('freeze-timer-shutdown scenario 3', solve('freeze-timer-shutdown', ('pageshow',True,False,[],['a','b'],3,1)), [])
check('freeze-timer-shutdown scenario 4', solve('freeze-timer-shutdown', ('pageshow',False,False,[],[],1,1)), [])
check('freeze-timer-shutdown scenario 5', solve('freeze-timer-shutdown', ('freeze',False,True,['socket'],['a'],2,2)), ['socket'])
check('freeze-timer-shutdown scenario 6', solve('freeze-timer-shutdown', ('resume',False,True,['timer'],['a'],2,3)), ['timer'])
check('dirty-pagehide-flush scenario 1', solve('dirty-pagehide-flush', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), True)
check('dirty-pagehide-flush scenario 2', solve('dirty-pagehide-flush', ('pagehide',False,True,['timer'],[],1,1)), True)
check('dirty-pagehide-flush scenario 3', solve('dirty-pagehide-flush', ('pageshow',True,False,[],['a','b'],3,1)), False)
check('dirty-pagehide-flush scenario 4', solve('dirty-pagehide-flush', ('pageshow',False,False,[],[],1,1)), False)
check('dirty-pagehide-flush scenario 5', solve('dirty-pagehide-flush', ('freeze',False,True,['socket'],['a'],2,2)), False)
check('dirty-pagehide-flush scenario 6', solve('dirty-pagehide-flush', ('resume',False,True,['timer'],['a'],2,3)), False)
check('preserved-client-queue scenario 1', solve('preserved-client-queue', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), ['a']*N)
check('preserved-client-queue scenario 2', solve('preserved-client-queue', ('pagehide',False,True,['timer'],[],1,1)), [])
check('preserved-client-queue scenario 3', solve('preserved-client-queue', ('pageshow',True,False,[],['a','b'],3,1)), ['a','b'])
check('preserved-client-queue scenario 4', solve('preserved-client-queue', ('pageshow',False,False,[],[],1,1)), [])
check('preserved-client-queue scenario 5', solve('preserved-client-queue', ('freeze',False,True,['socket'],['a'],2,2)), ['a'])
check('preserved-client-queue scenario 6', solve('preserved-client-queue', ('resume',False,True,['timer'],['a'],2,3)), ['a'])
check('resume-queue-drain scenario 1', solve('resume-queue-drain', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), [])
check('resume-queue-drain scenario 2', solve('resume-queue-drain', ('pagehide',False,True,['timer'],[],1,1)), [])
check('resume-queue-drain scenario 3', solve('resume-queue-drain', ('pageshow',True,False,[],['a','b'],3,1)), ['a','b'])
check('resume-queue-drain scenario 4', solve('resume-queue-drain', ('pageshow',False,False,[],[],1,1)), [])
check('resume-queue-drain scenario 5', solve('resume-queue-drain', ('freeze',False,True,['socket'],['a'],2,2)), [])
check('resume-queue-drain scenario 6', solve('resume-queue-drain', ('resume',False,True,['timer'],['a'],2,3)), ['a'])
check('resume-event-source scenario 1', solve('resume-event-source', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'ordinary')
check('resume-event-source scenario 2', solve('resume-event-source', ('pagehide',False,True,['timer'],[],1,1)), 'ordinary')
check('resume-event-source scenario 3', solve('resume-event-source', ('pageshow',True,False,[],['a','b'],3,1)), 'bfcache')
check('resume-event-source scenario 4', solve('resume-event-source', ('pageshow',False,False,[],[],1,1)), 'ordinary')
check('resume-event-source scenario 5', solve('resume-event-source', ('freeze',False,True,['socket'],['a'],2,2)), 'ordinary')
check('resume-event-source scenario 6', solve('resume-event-source', ('resume',False,True,['timer'],['a'],2,3)), 'thaw')
check('resource-disposal-on-unload scenario 1', solve('resource-disposal-on-unload', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), [])
check('resource-disposal-on-unload scenario 2', solve('resource-disposal-on-unload', ('pagehide',False,True,['timer'],[],1,1)), ['timer'])
check('resource-disposal-on-unload scenario 3', solve('resource-disposal-on-unload', ('pageshow',True,False,[],['a','b'],3,1)), [])
check('resource-disposal-on-unload scenario 4', solve('resource-disposal-on-unload', ('pageshow',False,False,[],[],1,1)), [])
check('resource-disposal-on-unload scenario 5', solve('resource-disposal-on-unload', ('freeze',False,True,['socket'],['a'],2,2)), [])
check('resource-disposal-on-unload scenario 6', solve('resource-disposal-on-unload', ('resume',False,True,['timer'],['a'],2,3)), [])
check('suspended-work-reason scenario 1', solve('suspended-work-reason', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 'cached')
check('suspended-work-reason scenario 2', solve('suspended-work-reason', ('pagehide',False,True,['timer'],[],1,1)), None)
check('suspended-work-reason scenario 3', solve('suspended-work-reason', ('pageshow',True,False,[],['a','b'],3,1)), None)
check('suspended-work-reason scenario 4', solve('suspended-work-reason', ('pageshow',False,False,[],[],1,1)), None)
check('suspended-work-reason scenario 5', solve('suspended-work-reason', ('freeze',False,True,['socket'],['a'],2,2)), 'frozen')
check('suspended-work-reason scenario 6', solve('suspended-work-reason', ('resume',False,True,['timer'],['a'],2,3)), None)
check('revalidation-observed-version scenario 1', solve('revalidation-observed-version', ('pagehide',True,True,['timer','socket'],['a']*N,3,2)), 2)
check('revalidation-observed-version scenario 2', solve('revalidation-observed-version', ('pagehide',False,True,['timer'],[],1,1)), 1)
check('revalidation-observed-version scenario 3', solve('revalidation-observed-version', ('pageshow',True,False,[],['a','b'],3,1)), 3)
check('revalidation-observed-version scenario 4', solve('revalidation-observed-version', ('pageshow',False,False,[],[],1,1)), 1)
check('revalidation-observed-version scenario 5', solve('revalidation-observed-version', ('freeze',False,True,['socket'],['a'],2,2)), 2)
check('revalidation-observed-version scenario 6', solve('revalidation-observed-version', ('resume',False,True,['timer'],['a'],2,3)), 2)
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 fixtureActualExpectedOutcome
preserved-page-disposition scenario 1suspendsuspendPassed
preserved-page-disposition scenario 2disposedisposePassed
preserved-page-disposition scenario 3keepkeepPassed
preserved-page-disposition scenario 4keepkeepPassed
preserved-page-disposition scenario 5keepkeepPassed
preserved-page-disposition scenario 6keepkeepPassed
resume-revalidation scenario 1FalseFalsePassed
resume-revalidation scenario 2FalseFalsePassed
resume-revalidation scenario 3TrueTruePassed
resume-revalidation scenario 4FalseFalsePassed
resume-revalidation scenario 5FalseFalsePassed
resume-revalidation scenario 6TrueTruePassed
freeze-timer-shutdown scenario 1['socket']['socket']Passed
freeze-timer-shutdown scenario 2[][]Passed
freeze-timer-shutdown scenario 3[][]Passed
freeze-timer-shutdown scenario 4[][]Passed
freeze-timer-shutdown scenario 5['socket']['socket']Passed
freeze-timer-shutdown scenario 6['timer']['timer']Passed
dirty-pagehide-flush scenario 1TrueTruePassed
dirty-pagehide-flush scenario 2TrueTruePassed
dirty-pagehide-flush scenario 3FalseFalsePassed
dirty-pagehide-flush scenario 4FalseFalsePassed
dirty-pagehide-flush scenario 5FalseFalsePassed
dirty-pagehide-flush scenario 6FalseFalsePassed
preserved-client-queue scenario 1['a']['a']Passed
preserved-client-queue scenario 2[][]Passed
preserved-client-queue scenario 3['a', 'b']['a', 'b']Passed
preserved-client-queue scenario 4[][]Passed
preserved-client-queue scenario 5['a']['a']Passed
preserved-client-queue scenario 6['a']['a']Passed
resume-queue-drain scenario 1[][]Passed
resume-queue-drain scenario 2[][]Passed
resume-queue-drain scenario 3['a', 'b']['a', 'b']Passed
resume-queue-drain scenario 4[][]Passed
resume-queue-drain scenario 5[][]Passed
resume-queue-drain scenario 6['a']['a']Passed
resume-event-source scenario 1ordinaryordinaryPassed
resume-event-source scenario 2ordinaryordinaryPassed
resume-event-source scenario 3thawbfcacheFailed
resume-event-source scenario 4thawordinaryFailed
resume-event-source scenario 5ordinaryordinaryPassed
resume-event-source scenario 6thawthawPassed
resource-disposal-on-unload scenario 1[][]Passed
resource-disposal-on-unload scenario 2['timer']['timer']Passed
resource-disposal-on-unload scenario 3[][]Passed
resource-disposal-on-unload scenario 4[][]Passed
resource-disposal-on-unload scenario 5[][]Passed
resource-disposal-on-unload scenario 6[][]Passed
suspended-work-reason scenario 1cachedcachedPassed
suspended-work-reason scenario 2NoneNonePassed
suspended-work-reason scenario 3NoneNonePassed
suspended-work-reason scenario 4NoneNonePassed
suspended-work-reason scenario 5frozenfrozenPassed
suspended-work-reason scenario 6NoneNonePassed
revalidation-observed-version scenario 122Passed
revalidation-observed-version scenario 211Passed
revalidation-observed-version scenario 333Passed
revalidation-observed-version scenario 411Passed
revalidation-observed-version scenario 522Passed
revalidation-observed-version scenario 622Passed

SHA-256 / 9be19f45f64cd7a6602d867662cc049ca8ff0f566650b0fca258d0131a4f7115

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 60 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.

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Verification & scope

Only the explicitly specified operations and finite deterministic records are modeled; no browser or framework conformance is claimed. 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 2026-09-29T14:40:54.442189+00:00.

Case digest / 75d0daa3098b4fc9de335a5d8e869cc29d8b66535a9ad3ab739e43de4dea21f9