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 rate99.6%52,280 / 52,494
Failed19717 timeouts
Latest run#1017b13e366b · Sep 16, 2026
TimelineAug 18, 2026 through Sep 16, 20269 of 93 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%Aug 18Sep 1Sep 16
  • 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 min3.9 min7.7 min11.6 min15.5 minAug 18Sep 1Sep 16

groups

Top-level test groups

Built-ins

99.6%

23,717 passed / 23,812 run

Harness

100.0%

116 passed / 116 run

Intl402

99.6%

3,344 passed / 3,357 run

Language

100.0%

23,717 passed / 23,726 run

Staging

93.5%

1,386 passed / 1,483 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/Iterator86.1%563 / 654
staging/sm93.2%1,310 / 1,406
intl402/Locale94.0%158 / 168
built-ins/decodeURI98.2%54 / 55
built-ins/decodeURIComponent98.2%55 / 56