ECMAScript compatibility
test262 dashboard
Generated at website build time from main-branch test262 reports. The timeline keeps the latest available result for each day.
Latest pass rate99.6%52,110 / 52,318
Failed19612 timeouts
Latest run#79331f1f0ab · Jul 11, 2026
TimelineJun 12, 2026 through Jul 11, 202626 of 59 daily points
time diagram
test262 pass rate over time
- Built-ins
- Harness
- Intl402
- Language
- Staging
performance
test262 runtime over time
groups
Top-level test groups
Built-ins
99.7%23,600 passed / 23,668 run
Harness
100.0%116 passed / 116 run
Intl402
99.8%3,335 passed / 3,341 run
Language
100.0%23,711 passed / 23,711 run
Staging
91.0%1,348 passed / 1,482 run
coverage extremes
Grouped by test262 path
Groups use the first two path segments and include at least 25 attempted tests.
Five least covered groups
| Group | Pass rate | Passing |
|---|---|---|
built-ins/AsyncFromSyncIteratorPrototype | 89.5% | 34 / 38 |
staging/sm | 90.6% | 1,274 / 1,406 |
built-ins/Map | 95.6% | 195 / 204 |
built-ins/WeakRef | 96.6% | 28 / 29 |
built-ins/FinalizationRegistry | 97.9% | 46 / 47 |