ECMAScript compatibility

test262 dashboard

Loaded from published main-branch test262 reports in Vercel Blob and cached for 15 minutes. The timeline keeps the latest available result for each day.

Markdown summaryJSON resultGitHub run
Overall corpus pass rate99.8%52,220 / 52,342
Failed10517 timeouts
Latest run#8763a5c305d · Aug 2, 2026
TimelineJul 4, 2026 through Aug 2, 202623 of 75 daily points

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%Jul 4Jul 9Jul 13Jul 17Jul 23Jul 30Aug 2
  • 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 min5.2 min10.4 min15.6 min20.9 minJul 4Jul 9Jul 13Jul 17Jul 23Jul 30Aug 2

groups

Top-level test groups

Built-ins

100.0%

23,666 passed / 23,668 run

Harness

100.0%

116 passed / 116 run

Intl402

99.6%

3,344 passed / 3,357 run

Language

100.0%

23,710 passed / 23,719 run

Staging

93.4%

1,384 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
staging/sm93.1%1,309 / 1,406
intl402/Locale94.0%158 / 168
built-ins/decodeURI98.2%54 / 55
built-ins/decodeURIComponent98.2%55 / 56
intl402/DurationFormat99.1%109 / 110