Disabled/flaky/slow web-platform-tests Report

A disabled test is a test that is not run, maybe because it is flaky or because the feature it is testing is not yet implemented. For WebKit and Chromium, this is denoted as "[ Skip ]" or "[ WontFix ]". For Mozilla, this is denoted as "disabled".

A flaky test is a test that gives inconsistent results, e.g., sometimes passing and sometimes failing. For Chromium and WebKit, this is denoted as "[ Pass Failure ]" (or other combinations of results).

A slow test is a test that is marked as taking a long time to run. For Chromium and WebKit, this is denoted as "[ Slow ]".

The tables below show all tests in web-platform-tests that are disabled, flaky, or slow, in 3, 2, and 1 browsers. Tests that show up for more than one browser are likely to be due to issues with the tests.

This report is generated from this search result for Mozilla, the TestExpectations, NeverFixTests and SlowTests files for Chromium, this TestExpectations file for WebKit, and this search result in web-platform-tests.

This site is forked from Bocoup's original, now defunct (references removed to not show their endorsement of this site as per license). They stopped running this since ~Dec 2020, hence the large gap in data until this fork's inception (~Sep 2023).

Generated on 2026-04-19. Source on GitHub (issues/feedback). Data is also available in JSON format.

Also see PRs with the flaky label, which represent work to fix tests in this report.

The graph below shows changes of number of tests over time (CSV format).

Start: Filter:

3 browsers (8 tests)

2 browsers (328 tests)

1 browser (5369 tests)