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
Timeline range

time diagram

test262 pass rate over time

test262 pass rate over timePass-rate lines for each top-level test262 category across the latest available main-branch CI result for each day.0%25%50%75%100%Jun 12Jun 16Jun 20Jun 27Jul 1Jul 5Jul 10Jul 11
  • Built-ins
  • Harness
  • Intl402
  • Language
  • Staging

performance

test262 runtime over time

test262 runtime over timeDuration in minutes for the latest available main-branch test262 CI result for each day.0.0 min7.1 min14.3 min21.4 min28.6 minJun 12Jun 16Jun 20Jun 27Jul 1Jul 5Jul 10Jul 11

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

GroupPass ratePassing
built-ins/AsyncFromSyncIteratorPrototype89.5%34 / 38
staging/sm90.6%1,274 / 1,406
built-ins/Map95.6%195 / 204
built-ins/WeakRef96.6%28 / 29
built-ins/FinalizationRegistry97.9%46 / 47