WPT
wpt / fs / FileSystemObserver.https.tentative.any.worker.html
Spec: File System ↗
Runs: Chrome 155.0.8042.0 (wpt@a1ecd0c09, 2026-09-04) | Firefox 157.0a1 (wpt@a1ecd0c09, 2026-09-04) | Safari 251 preview (wpt@e7122b73f, 2026-09-04) | Ladybird 1.0-52f0f (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 | 16/16 | 0/16 | 0/16 | 0/16 | 0/16 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Creating a FileSystemObserver from a supported global succeeds | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Calling unobserve() without a corresponding observe() shouldn't throw | PASS | FAIL | FAIL | FAIL | FAIL | — |
| unobserve() is idempotent | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Calling disconnect() without observing shouldn't throw | PASS | FAIL | FAIL | FAIL | FAIL | — |
| disconnect() is idempotent | PASS | FAIL | FAIL | FAIL | FAIL | — |
| observe() fails when file does not exist | PASS | FAIL | FAIL | FAIL | FAIL | — |
| observe() fails when directory does not exist | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Creating a file through FileSystemDirectoryHandle.getFileHandle is reported as an "appeared" event if in scope | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Removing a file through FileSystemFileHandle.remove is reported as an "disappeared" event if in scope | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Events outside the watch scope are not sent to the observer's callback | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Moving a file through FileSystemFileHandle.move is reported as a "moved" event if destination and source are in scope | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Moving a file through FileSystemFileHandle.move is not reported if destination and source are not in scope | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Moving a file through FileSystemFileHandle.move is reported as a "appeared" event if only destination is in scope | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Moving a file through FileSystemFileHandle.move is reported as a "disappeared" event if only source is in scope | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Observations stop after disconnect() | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |
| Observations stop for all observed handles after disconnect() | PASS | NOTRUN | NOTRUN | FAIL | FAIL | — |