Inventories every animation and scroll effect, defines a calm alternative for prefers-reduced-motion, and verifies content, focus, and end events still work when motion is off.
reduced-motion catches and prevents prefers-reduced-motion fallback bugs, so animations, transitions and autoplay respect the motion preference instead of leaving content invisible.
Evaluate whether a feature is actually finished by walking it through eight paths — happy, error, empty, loading, permission, mobile, accessibility, and recovery — and produce a completeness scorecard with a prioritized gap list. Use before calling a feature…
Make every animation, transition, scroll effect, and autoplaying element respect prefers-reduced-motion, and prove that the reduced path still works — content visible, transitions finished, end events and timers resolved, focus and scroll correct. Inventories…
Enumerate and design every state a UI surface can be in — initial, loading, empty, populated, partial, error, stale, offline, disabled, permission-denied — and produce a state matrix before or alongside implementation. Use when building or reviewing any page,…
Design the full lifecycle of user-triggered asynchronous actions — pending feedback, timing thresholds, double-submit prevention, race conditions and stale responses, optimistic updates with rollback, retry and idempotency, cancellation, long-running and…
