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
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%May 17May 21May 29Jun 3Jun 8Jun 13Jun 14
  • 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 min5.7 min11.5 min17.2 min23.0 minMay 17May 21May 29Jun 3Jun 8Jun 13Jun 14

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

GroupPass ratePassing
built-ins/ShadowRealm0.0%0 / 64
intl402/Temporal7.6%155 / 2,029
intl402/DurationFormat32.7%36 / 110
intl402/ListFormat44.4%36 / 81
built-ins/SharedArrayBuffer49.0%51 / 104