Hi Philip, We (at Igalia) are strong supporters of WPT tests and we've appreciated a lot the effort made by Youenn and others to make them possible in WebKit. They are very important for interoperability and make life much easier for developers working on different WebKit ports and different Web engines.
Ideally, we believe that future conformance tests in WebKit should be written using the WPT format and submitted to web-platform-tests repository (of course there are exceptions when the WPT API is too limited). WPT tests have references to spec URLs and their own git history, so it should always be possible to know why they have been written. This also reduces review cost on WebKit's side, as test review can be done by experts in the relevant specs. Probably it would be nice to convert old tests to WPT and check duplication to avoid increasing runtime cost but that's indeed going to be a big effort. It could also be possible to improve how the CI tests are executed in the WebKit project, taking inspiration from Chromium or Mozilla projects (i.e. run all tests before a patch lands in the main repo, but allowing devs to run a relevant subset during development). In any case, Igalia definitely supports this proposal and is happy to help where possible. Frédéric, for Igalia's Web Platform Team
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