What problem does it solve? Animation code often ships with subtle craft defects — sluggish easing, wrong transform origins, non-GPU properties, missing reduced-motion handling — that make interfaces feel slow or broken even when they technically work. This Skill reviews motion code against a strict, opinionated standards catalog so those issues are caught before merge. ## Core Features & Use Cases - Standards-based review: Evaluates every animation against ten non-negotiable rules covering easing curves, sub-300ms durations, transform origins, interruptibility, GPU-only properties, and accessibility. - Escalation triggers: Flags known anti-patterns on sight, such as transition: all, scale(0) entrances, ease-in on UI, and keyframes on rapidly-triggered elements. - Structured verdict output: Produces a findings table with before/after fixes plus a tiered verdict ending in an explicit Block or Approve decision. - Use Case: A developer opens a pull request adding a dropdown menu animation. The review catches transform-origin: center on a trigger-anchored popover and a 400ms duration, then prescribes the exact cubic-bezier curve and 150–250ms range from the standards reference. ## Quick Start Review the animation code in this pull request and flag any motion that violates the standards.
