- Added Bun support for the test runner, new onlyFailures reporters, exclusive test lock, and PLAYWRIGHT_TRANSFORM_CACHE_DIR env var.
- Introduced new APIs: timeout and signal options for cdpSession.send, testRun.mode, and updated test annotations.
- Breaking changes: TypeScript class fields now follow useDefineForClassFields, actions wait for inert elements, cookie handling follows RFC 6265, proxy credentials scope changed, and .css/.less/.scss imports load as empty modules.