WPT
wpt / fs / FileSystemFileHandle-writable-file-stream-lock-modes.https.tentative.worker.html
Spec: File System ↗
Runs: Chrome 155.0.8042.0 (wpt@0588f3896, 2026-09-04) | Firefox 157.0a1 (wpt@0588f3896, 2026-09-04) | Safari 251 preview (wpt@0588f3896, 2026-09-04) | Ladybird 1.0-b1af2 (wpt@0588f3896, 2026-09-04) | Servo Servo 0.6 (wpt@2c385f65e, 2026-09-04) | Blitz a50cb8971 (wpt@a95401e4e, 2026-09-03)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 15/15 | 5/15 | 5/15 | 0/15 | 0/15 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| A writable stream opens in siloed mode by default | PASS | FAIL | FAIL | FAIL | FAIL | — |
| A writable stream in siloed mode has a mode property equal to siloed | PASS | FAIL | FAIL | FAIL | FAIL | — |
| A writable stream in siloed mode takes a lock that is shared | PASS | PASS | PASS | FAIL | FAIL | — |
| When there's an open writable stream in siloed mode on a file, can open another writable stream in siloed on a different file | PASS | PASS | PASS | FAIL | FAIL | — |
| When there's an open writable stream in siloed mode on a file, can open another writable stream in exclusive on a different file | PASS | PASS | PASS | FAIL | FAIL | — |
| When there's an open writable stream in siloed mode on a file, cannot open another writable stream in exclusive on that same file | PASS | FAIL | FAIL | FAIL | FAIL | — |
| After all writable streams in siloed mode on a file has been closed, can open another writable stream in exclusive on the same file | PASS | FAIL | FAIL | FAIL | FAIL | — |
| A writable stream in exclusive mode has a mode property equal to exclusive | PASS | FAIL | FAIL | FAIL | FAIL | — |
| A writable stream in exclusive mode takes a lock that is exclusive | PASS | FAIL | FAIL | FAIL | FAIL | — |
| When there's an open writable stream in exclusive mode on a file, can open another writable stream in siloed on a different file | PASS | PASS | PASS | FAIL | FAIL | — |
| When there's an open writable stream in exclusive mode on a file, cannot open another writable stream in siloed on that same file | PASS | FAIL | FAIL | FAIL | FAIL | — |
| After a writable stream in exclusive mode on a file has been closed, can open another writable stream in siloed on the same file | PASS | FAIL | FAIL | FAIL | FAIL | — |
| When there's an open writable stream in exclusive mode on a file, can open another writable stream in exclusive on a different file | PASS | PASS | PASS | FAIL | FAIL | — |
| When there's an open writable stream in exclusive mode on a file, cannot open another writable stream in exclusive on that same file | PASS | FAIL | FAIL | FAIL | FAIL | — |
| After a writable stream in exclusive mode on a file has been closed, can open another writable stream in exclusive on the same file | PASS | FAIL | FAIL | FAIL | FAIL | — |