Single-page checklist for inspecting a used MacBook before buying, with built-in browser tests (dead pixels, keyboard, camera, microphone, speakers, trackpad, port charging) and terminal commands whose output can be pasted back to auto-mark the checklist.
Live: https://viktor-silakov.github.io/check-mac/
Languages: English (default), Russian, Spanish, German. No build step, no dependencies — one index.html.