What is Container Browser (CDP / Playwright)?
The runner Chrome driven over DevTools protocol for automated checks. One shared browser, sessions with lifecycles — never install another one per test.
Related terms
BYOB Testing Extension
The real-browser driver that lets the testing agent click, type, and scroll like a user. Scripted checks assert structure; the extension proves behavior.
Visual Testing Agent
A preview-URL auditor that checks rendered pages like a visitor would. Read-only by default; writes structured findings the builder can act on.
Browser Session Lifecycle
Start, act, close: sessions are opened, driven through explicit actions, and torn down. Lifecycle hygiene prevents zombie browsers eating runner resources.
Svelte Runes
The `$state`, `$derived`, `$effect`, and `$props` primitives powering Svelte 5 reactivity. Runes are mandatory in generated code: explicit, compilable, and consistent across every component.
File-Based Routing
Pages defined by file location: `+page.svelte` renders, `+layout.svelte` wraps, `+server.js` serves data. The route tree is the app map — no separate router config to drift.
Load Function
Server-side data loading for a route before it renders. Load on the server for content crawlers and users need immediately; reach for client fetching only for interactive extras.