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Playwright

Playwright is Microsoft's browser automation + E2E testing framework (Chromium, Firefox, WebKit) with a single API.

Role on this wiki

• 380 Playwright E2E tests in vinext's test suite (unit tests miss a lot of subtle browser issues — hydration, client-side navigation, rendered output).
• Part of AI agent guardrails that made the AI-driven rewrite reviewable.

Seen in

• sources/2026-02-24-cloudflare-how-we-rebuilt-nextjs-with-ai-in-one-week

Related

• systems/vinext — production consumer (E2E tier).
• systems/vitest — complementary unit tier.
• systems/agent-browser — Vercel's AI-driven browser- verification tool used alongside Playwright in vinext.