WPT
wpt / dom / observable / tentative / observable-first.any.html
Spec: DOM ↗
Runs: Chrome 155.0.8041.0 (wpt@4a01b83e3, 2026-09-04) | Firefox 157.0a1 (wpt@e7122b73f, 2026-09-04) | Safari 251 preview (wpt@2c385f65e, 2026-09-04) | Ladybird 1.0-70fb3 (wpt@4a01b83e3, 2026-09-04) | Servo Servo 0.6 (wpt@7e3d005d7, 2026-09-03) | 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 | 5/5 | 0/5 | 0/5 | 0/5 | 0/5 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| first(): Promise resolves with the first value from the source Observable | PASS | FAIL | FAIL | FAIL | FAIL | — |
| first(): Promise rejects with the error emitted from the source Observable | PASS | FAIL | FAIL | FAIL | FAIL | — |
| first(): Promise rejects with RangeError when source Observable completes without emitting any values | PASS | FAIL | FAIL | FAIL | FAIL | — |
| first(): Aborting a signal rejects the Promise with an AbortError DOMException | PASS | FAIL | FAIL | FAIL | FAIL | — |
| first(): Lifecycle | PASS | FAIL | FAIL | FAIL | FAIL | — |