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# ADR-0003: Keep Browser Testing Resources Project-Local
Status: Accepted
Date: 2026-07-14
## Context
Browser tests and diagnostics run in a headless Debian development container. The toolchain needs repeatable versions and repository-scoped resources.
## Decision
- Use Playwright Test with bundled Chromium for repeatable E2E tests.
- Keep E2E tests separate from `npm run check` because browser installation is an explicit setup step.
- Run Chromium headlessly with profile isolation and sandboxing.
- Store npm and browser caches under `.cache/`.
- Store traces, screenshots, videos, and CLI output under `.artifacts/`.
## Consequences
- A fresh environment installs npm dependencies, browser libraries, and the pinned Chromium revision before browser work.
- Browser failures can retain diagnostics without adding generated files to source control.
- Repository configuration controls browser versions and artifact locations.