Compliance·Test262 and Web Platform Tests·reviewed 2026-09-14

Every compliance suite in one place.

Test262 measures JavaScript execution. Web Platform Tests measure the selected CSS, DOM and HTML surface. Each suite keeps its own result and its own limits.

69,656
Test262 raw PASS
67.88 % of 102,619 variants
102,619
Test262 variants
53,428 source files
541
WPT PASS in the current run
1.23 % of 44,153 cases
44,153
WPT manifest cases
css, dom, html

2 suitesDownload the compliance data ↗

ECMAScript

Test262 Measured

The full selected test/ directory of the pinned checkout. The raw run status is FAIL because non-PASS results remain. The policy overlay is reported separately, on the Test262 page.

102,619variants53,428 source files · raw PASS 67.88 %
Pass 69,656Runtime failure 21,141Negative result unverified 8,392Compile failure 2,448Module pipeline boundary 842Unexpected accepted negative 63Negative phase mismatch 27Async completion incomplete 48Timeout 2
Open the Test262 report → Result data ↗ Full test file index ↗ Source commit ↗
Web platform

Web Platform Tests Incomplete

The complete selected manifest for CSS, DOM and HTML. The recorded run executed only the admitted harness cases; blocked and not-run cases stay visible in the full case index.

44,153manifest casesraw status INTERRUPTED · PASS 1.23 % · run at Attar revision e04107d5cb6e
Pass 541Fail 485Blocked 40,559Registration blocked 430Incomplete 2Compile blocked 1Runtime failed 1Crash 4Not run 2,130
ResultCasesShare
PassPASS5411.23 %
FailFAIL4851.10 %
BlockedBLOCKED40,55991.86 %
Registration blockedREGISTRATION_BLOCKED4300.97 %
IncompleteINCOMPLETE20.00 %
Compile blockedCOMPILE_BLOCKED10.00 %
Runtime failedRUNTIME_FAILED10.00 %
CrashCRASH40.01 %
Not runNOT_RUN2,1304.82 %

Not a WPT conformance score: 40,559 cases were blocked and 2,130 did not run. Complete selected manifest URL inventory; admitted testharness scripts run in isolated AOT/Blink processes. Other cases remain blocked. This is not full WPT conformance.

Full WPT case index ↗
How to read the map

Measured is not passed.

Compliance suites keep separate denominators. A measured or incomplete report is not a product certification.

The two suite states

Measured: the suite report exists with its recorded counts. It does not mean every case passes.

Incomplete: the selected manifest is recorded, but the harness did not execute every case.

What the data holds

INTENTIONALLY_UNSUPPORTED is a Test262 reporting overlay for accepted Attar boundaries. It changes no raw result ID and never counts as PASS.

The JSON files carry public test names, statuses and aggregate identities. They carry no local paths and no failure detail text.

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