Check that LayoutTests/resources/testharness.js is in sync with LayoutTests/imported/w3c/web-platform-tests/resources/testharness.js Do this also for dependencies. It makes sense to keep testharness.js matching the big chunk of imported test cases that use the harness. It makes sense to keep testharness.js relatively up to date: - to get improvements in testharness.js (maybe more strict assertions, tests more) - to match what web-platform-tests need in case the tests are upstreamed - to match what online documentation says about testharness.js testharness.js dependencies are as of writing: - idlharness.js - webidl2.js copied to WebIDLParser.js
<rdar://problem/88619980>