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 rate95.9%50,373 / 52,530
Failed2,14611 timeouts
Latest run#182030663c7c · Nov 1, 2026
TimelineOct 3, 2026 through Nov 1, 202627 of 132 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%Oct 3Oct 9Oct 13Oct 17Oct 21Oct 26Oct 30Nov 1
  • 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 min1.0 min1.9 min2.9 min3.9 minOct 3Oct 9Oct 13Oct 17Oct 21Oct 26Oct 30Nov 1

groups

Top-level test groups

Built-ins

98.8%

23,534 passed / 23,823 run

Harness

100.0%

116 passed / 116 run

Intl402

99.3%

3,360 passed / 3,382 run

Language

92.6%

21,962 passed / 23,726 run

Staging

94.5%

1,401 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
language/literals67.2%360 / 536
language/global-code78.6%33 / 42
language/module-code81.8%490 / 599
built-ins/Iterator86.1%563 / 654
built-ins/RegExp89.8%1,687 / 1,879