- Adds first‑class HAR recording via tracing.startHar()/tracing.stopHar() and a new drop() API for simulating file/clipboard drag‑and‑drop.
- Extends accessibility testing with page-level aria snapshots, new description option for getByRole, pseudo‑element CSS checks, and styleable highlights.
- Introduces test.abort() for aborting tests, new browser/context events, extra reporting diagnostics, and a set of breaking removals of long‑deprecated APIs.