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 rate83.7%43,736 / 52,233
Failed8,4952 timeouts
Latest run#641e5c30775 · Jun 14, 2026
TimelineMay 17, 2026 through Jun 14, 202622 of 36 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
79.0%18,683 passed / 23,643 run
harness
100.0%116 passed / 116 run
intl402
30.6%1,024 passed / 3,341 run
language
97.3%22,998 passed / 23,648 run
staging
61.6%915 passed / 1,485 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/ShadowRealm | 0.0% | 0 / 64 |
intl402/Temporal | 7.6% | 155 / 2,029 |
intl402/DurationFormat | 32.7% | 36 / 110 |
intl402/ListFormat | 44.4% | 36 / 81 |
built-ins/SharedArrayBuffer | 49.0% | 51 / 104 |