WPT
wpt / js / builtins / weakrefs / gc-has-one-chance-to-call-cleanupCallback-queueMicrotaskMutationObserver.optional.window.html
Spec: https://tc39.es/ecma262/ ↗
Runs: Chrome 155.0.8041.0 (wpt@2c385f65e, 2026-09-04) | Firefox 157.0a1 (wpt@2c385f65e, 2026-09-04) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-a7825 (wpt@2c385f65e, 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 | 0/1 | 0/1 | 0/1 | 0/1 | 0/1 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| cleanupCallback has only one optional chance to be called for a GC that cleans up a registered target. | FAIL | FAIL | FAIL | FAIL | FAIL | — |