WPT
wpt / dom / nodes / MutationObserver-sanity.html
Spec: DOM ↗
Runs: Chrome 155.0.8042.0 (wpt@4eb09bcd9, 2026-09-04) | Firefox 157.0a1 (wpt@c3fcbf4ba, 2026-09-04) | Safari 251 preview (wpt@e7122b73f, 2026-09-04) | Ladybird 1.0-52f0f (wpt@a1ecd0c09, 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 | 16/16 | 16/16 | 16/16 | 16/16 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Should throw if none of childList, attributes, characterData are true | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if childList is true | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributes is true | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if characterData is true | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributeOldValue is true and attributes is omitted | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if characterDataOldValue is true and characterData is omitted | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributeFilter is present and attributes is omitted | PASS | PASS | PASS | PASS | PASS | — |
| Should throw if attributeOldValue is true and attributes is false | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributeOldValue and attributes are both true | PASS | PASS | PASS | PASS | PASS | — |
| Should throw if attributeFilter is present and attributes is false | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributeFilter is present and attributes is true | PASS | PASS | PASS | PASS | PASS | — |
| Should throw if characterDataOldValue is true and characterData is false | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if characterDataOldValue is true and characterData is true | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if attributeOldValue is false and attributes is omitted | PASS | PASS | PASS | PASS | PASS | — |
| Should not throw if characterDataOldValue is false and characterData is omitted | PASS | PASS | PASS | PASS | PASS | — |
| attributeOldValue:false (present) auto-enables attribute observation | PASS | PASS | PASS | PASS | PASS | — |