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FA-35581 / Tab interfaces / Open access

Strip reveal: visible origin · case 01

The tab workspace reports an incorrect visible origin.

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

ROOT CAUSE

The visible origin decision uses x['scroll'] instead of x['scroll']+x['pinned'].

VERIFIED REPAIR

Use the stipulated workspace rule: x['scroll']+x['pinned'].

Unsuccessful approach: The partial repair x['pinned'] still violates a workspace boundary or normal case.

Case contract

Reveal a tab in a horizontally scrolled strip using its full bounds; account for pinned strip width and clamp to content scroll limits.

Why this case matters

Offline tab/panel workspace behavior; no browser or desktop framework is emulated.

1 / The failure

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

N = 1
observations = []
def solve(x):
    r0 = x['scroll']
    r1 = x['scroll']+x['viewport']
    r2 = x['left']<x['scroll']+x['pinned']
    r3 = x['right']>x['scroll']+x['viewport']
    r4 = max(0,x['total']-x['viewport'])
    r5 = max(0,min(x['total']-x['viewport'], x['left']-x['pinned'] if x['left']<x['scroll']+x['pinned'] else max(x['scroll'],x['right']-x['viewport'])))
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 110]), ({'left': 80, 'right': 110, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 60]), ({'left': 110, 'right': 140, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 90]), ({'left': 0, 'right': 30, 'scroll': 0, 'viewport': 100, 'pinned': 20, 'total': 400}, [20, 100, True, False, 300, 0]), ({'left': 350, 'right': 400, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 300]), ({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 0, 'total': 400}, [100, 200, False, True, 300, 110]), ({'left': 120, 'right': 200, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, False, 300, 100])], 2: [({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 220]), ({'left': 160, 'right': 220, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 120]), ({'left': 220, 'right': 280, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 180]), ({'left': 0, 'right': 60, 'scroll': 0, 'viewport': 200, 'pinned': 40, 'total': 800}, [40, 200, True, False, 600, 0]), ({'left': 700, 'right': 800, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 600]), ({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 0, 'total': 800}, [200, 400, False, True, 600, 220]), ({'left': 240, 'right': 400, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, False, 600, 200])], 3: [({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 330]), ({'left': 240, 'right': 330, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 180]), ({'left': 330, 'right': 420, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 270]), ({'left': 0, 'right': 90, 'scroll': 0, 'viewport': 300, 'pinned': 60, 'total': 1200}, [60, 300, True, False, 900, 0]), ({'left': 1050, 'right': 1200, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 900]), ({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 0, 'total': 1200}, [300, 600, False, True, 900, 330]), ({'left': 360, 'right': 600, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, False, 900, 300])], 4: [({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 440]), ({'left': 320, 'right': 440, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 240]), ({'left': 440, 'right': 560, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 360]), ({'left': 0, 'right': 120, 'scroll': 0, 'viewport': 400, 'pinned': 80, 'total': 1600}, [80, 400, True, False, 1200, 0]), ({'left': 1400, 'right': 1600, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 1200]), ({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 0, 'total': 1600}, [400, 800, False, True, 1200, 440]), ({'left': 480, 'right': 800, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, False, 1200, 400])], 5: [({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 550]), ({'left': 400, 'right': 550, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 300]), ({'left': 550, 'right': 700, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 450]), ({'left': 0, 'right': 150, 'scroll': 0, 'viewport': 500, 'pinned': 100, 'total': 2000}, [100, 500, True, False, 1500, 0]), ({'left': 1750, 'right': 2000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 1500]), ({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 0, 'total': 2000}, [500, 1000, False, True, 1500, 550]), ({'left': 600, 'right': 1000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, False, 1500, 500])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
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
workspace regression 0[100, 200, False, True, 300, 110][120, 200, False, True, 300, 110]Failed
workspace regression 1[100, 200, True, False, 300, 60][120, 200, True, False, 300, 60]Failed
workspace regression 2[100, 200, True, False, 300, 90][120, 200, True, False, 300, 90]Failed
workspace regression 3[0, 100, True, False, 300, 0][20, 100, True, False, 300, 0]Failed
workspace regression 4[100, 200, False, True, 300, 300][120, 200, False, True, 300, 300]Failed
workspace regression 5[100, 200, False, True, 300, 110][100, 200, False, True, 300, 110]Passed
workspace regression 6[100, 200, False, False, 300, 100][120, 200, False, False, 300, 100]Failed

SHA-256 / 5a93c929edfee920bfad1bedd6f653691fdcfed785080b1a41e1bd9a55a4009d

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    r0 = x['pinned']
    r1 = x['scroll']+x['viewport']
    r2 = x['left']<x['scroll']+x['pinned']
    r3 = x['right']>x['scroll']+x['viewport']
    r4 = max(0,x['total']-x['viewport'])
    r5 = max(0,min(x['total']-x['viewport'], x['left']-x['pinned'] if x['left']<x['scroll']+x['pinned'] else max(x['scroll'],x['right']-x['viewport'])))
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 110]), ({'left': 80, 'right': 110, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 60]), ({'left': 110, 'right': 140, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 90]), ({'left': 0, 'right': 30, 'scroll': 0, 'viewport': 100, 'pinned': 20, 'total': 400}, [20, 100, True, False, 300, 0]), ({'left': 350, 'right': 400, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 300]), ({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 0, 'total': 400}, [100, 200, False, True, 300, 110]), ({'left': 120, 'right': 200, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, False, 300, 100])], 2: [({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 220]), ({'left': 160, 'right': 220, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 120]), ({'left': 220, 'right': 280, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 180]), ({'left': 0, 'right': 60, 'scroll': 0, 'viewport': 200, 'pinned': 40, 'total': 800}, [40, 200, True, False, 600, 0]), ({'left': 700, 'right': 800, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 600]), ({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 0, 'total': 800}, [200, 400, False, True, 600, 220]), ({'left': 240, 'right': 400, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, False, 600, 200])], 3: [({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 330]), ({'left': 240, 'right': 330, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 180]), ({'left': 330, 'right': 420, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 270]), ({'left': 0, 'right': 90, 'scroll': 0, 'viewport': 300, 'pinned': 60, 'total': 1200}, [60, 300, True, False, 900, 0]), ({'left': 1050, 'right': 1200, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 900]), ({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 0, 'total': 1200}, [300, 600, False, True, 900, 330]), ({'left': 360, 'right': 600, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, False, 900, 300])], 4: [({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 440]), ({'left': 320, 'right': 440, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 240]), ({'left': 440, 'right': 560, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 360]), ({'left': 0, 'right': 120, 'scroll': 0, 'viewport': 400, 'pinned': 80, 'total': 1600}, [80, 400, True, False, 1200, 0]), ({'left': 1400, 'right': 1600, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 1200]), ({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 0, 'total': 1600}, [400, 800, False, True, 1200, 440]), ({'left': 480, 'right': 800, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, False, 1200, 400])], 5: [({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 550]), ({'left': 400, 'right': 550, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 300]), ({'left': 550, 'right': 700, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 450]), ({'left': 0, 'right': 150, 'scroll': 0, 'viewport': 500, 'pinned': 100, 'total': 2000}, [100, 500, True, False, 1500, 0]), ({'left': 1750, 'right': 2000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 1500]), ({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 0, 'total': 2000}, [500, 1000, False, True, 1500, 550]), ({'left': 600, 'right': 1000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, False, 1500, 500])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
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
workspace regression 0[20, 200, False, True, 300, 110][120, 200, False, True, 300, 110]Failed
workspace regression 1[20, 200, True, False, 300, 60][120, 200, True, False, 300, 60]Failed
workspace regression 2[20, 200, True, False, 300, 90][120, 200, True, False, 300, 90]Failed
workspace regression 3[20, 100, True, False, 300, 0][20, 100, True, False, 300, 0]Passed
workspace regression 4[20, 200, False, True, 300, 300][120, 200, False, True, 300, 300]Failed
workspace regression 5[0, 200, False, True, 300, 110][100, 200, False, True, 300, 110]Failed
workspace regression 6[20, 200, False, False, 300, 100][120, 200, False, False, 300, 100]Failed

SHA-256 / b735720fd0c8a6f504d797f080368deaa3b0b02f7d92256d9b0da1ae4498d9ab

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    r0 = x['scroll']+x['pinned']
    r1 = x['scroll']+x['viewport']
    r2 = x['left']<x['scroll']+x['pinned']
    r3 = x['right']>x['scroll']+x['viewport']
    r4 = max(0,x['total']-x['viewport'])
    r5 = max(0,min(x['total']-x['viewport'], x['left']-x['pinned'] if x['left']<x['scroll']+x['pinned'] else max(x['scroll'],x['right']-x['viewport'])))
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 110]), ({'left': 80, 'right': 110, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 60]), ({'left': 110, 'right': 140, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, True, False, 300, 90]), ({'left': 0, 'right': 30, 'scroll': 0, 'viewport': 100, 'pinned': 20, 'total': 400}, [20, 100, True, False, 300, 0]), ({'left': 350, 'right': 400, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, True, 300, 300]), ({'left': 130, 'right': 210, 'scroll': 100, 'viewport': 100, 'pinned': 0, 'total': 400}, [100, 200, False, True, 300, 110]), ({'left': 120, 'right': 200, 'scroll': 100, 'viewport': 100, 'pinned': 20, 'total': 400}, [120, 200, False, False, 300, 100])], 2: [({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 220]), ({'left': 160, 'right': 220, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 120]), ({'left': 220, 'right': 280, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, True, False, 600, 180]), ({'left': 0, 'right': 60, 'scroll': 0, 'viewport': 200, 'pinned': 40, 'total': 800}, [40, 200, True, False, 600, 0]), ({'left': 700, 'right': 800, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, True, 600, 600]), ({'left': 260, 'right': 420, 'scroll': 200, 'viewport': 200, 'pinned': 0, 'total': 800}, [200, 400, False, True, 600, 220]), ({'left': 240, 'right': 400, 'scroll': 200, 'viewport': 200, 'pinned': 40, 'total': 800}, [240, 400, False, False, 600, 200])], 3: [({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 330]), ({'left': 240, 'right': 330, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 180]), ({'left': 330, 'right': 420, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, True, False, 900, 270]), ({'left': 0, 'right': 90, 'scroll': 0, 'viewport': 300, 'pinned': 60, 'total': 1200}, [60, 300, True, False, 900, 0]), ({'left': 1050, 'right': 1200, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, True, 900, 900]), ({'left': 390, 'right': 630, 'scroll': 300, 'viewport': 300, 'pinned': 0, 'total': 1200}, [300, 600, False, True, 900, 330]), ({'left': 360, 'right': 600, 'scroll': 300, 'viewport': 300, 'pinned': 60, 'total': 1200}, [360, 600, False, False, 900, 300])], 4: [({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 440]), ({'left': 320, 'right': 440, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 240]), ({'left': 440, 'right': 560, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, True, False, 1200, 360]), ({'left': 0, 'right': 120, 'scroll': 0, 'viewport': 400, 'pinned': 80, 'total': 1600}, [80, 400, True, False, 1200, 0]), ({'left': 1400, 'right': 1600, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, True, 1200, 1200]), ({'left': 520, 'right': 840, 'scroll': 400, 'viewport': 400, 'pinned': 0, 'total': 1600}, [400, 800, False, True, 1200, 440]), ({'left': 480, 'right': 800, 'scroll': 400, 'viewport': 400, 'pinned': 80, 'total': 1600}, [480, 800, False, False, 1200, 400])], 5: [({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 550]), ({'left': 400, 'right': 550, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 300]), ({'left': 550, 'right': 700, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, True, False, 1500, 450]), ({'left': 0, 'right': 150, 'scroll': 0, 'viewport': 500, 'pinned': 100, 'total': 2000}, [100, 500, True, False, 1500, 0]), ({'left': 1750, 'right': 2000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, True, 1500, 1500]), ({'left': 650, 'right': 1050, 'scroll': 500, 'viewport': 500, 'pinned': 0, 'total': 2000}, [500, 1000, False, True, 1500, 550]), ({'left': 600, 'right': 1000, 'scroll': 500, 'viewport': 500, 'pinned': 100, 'total': 2000}, [600, 1000, False, False, 1500, 500])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
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
workspace regression 0[120, 200, False, True, 300, 110][120, 200, False, True, 300, 110]Passed
workspace regression 1[120, 200, True, False, 300, 60][120, 200, True, False, 300, 60]Passed
workspace regression 2[120, 200, True, False, 300, 90][120, 200, True, False, 300, 90]Passed
workspace regression 3[20, 100, True, False, 300, 0][20, 100, True, False, 300, 0]Passed
workspace regression 4[120, 200, False, True, 300, 300][120, 200, False, True, 300, 300]Passed
workspace regression 5[100, 200, False, True, 300, 110][100, 200, False, True, 300, 110]Passed
workspace regression 6[120, 200, False, False, 300, 100][120, 200, False, False, 300, 100]Passed

SHA-256 / 2355972db647c9731a239aafa9090085942de2c839bbdd5600b94447e499fa64

Verification & scope

Finite stipulated workspace snapshots only. Independent result fields describe observable obligations, not a full UI runtime. 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 2026-09-29T14:42:43.030825+00:00.

Case digest / cac910fd2ca645cf31ea4c72f6bac2767b7553584e2fa289f355069a5add5d02