What problem does it solve? Animation code often passes review because it technically works while feeling sluggish, firing too often, animating layout properties, or ignoring reduced-motion preferences. This Skill applies a strict, opinionated review bar to motion code so feel-breaking regressions are caught before merge. ## Core Features & Use Cases - Ten non-negotiable standards: Checks justified motion, frequency-appropriateness, responsive easing, sub-300ms UI durations, transform-origin correctness, interruptibility, GPU-only properties, accessibility, asymmetric timing, and cohesion. - Escalation triggers and remedial hierarchy: Flags transition: all, scale(0), ease-in on UI, keyframes on toasts, and layout-property animation on sight, then proposes fixes ordered from deletion to polish. - Structured output: Produces a Before/After/Why findings table plus a tiered verdict ending in an explicit Block or Approve decision, citing exact values from STANDARDS.md. - Use Case: A pull request adds a dropdown that fades in with ease-in over 400ms from scale(0). The review flags the easing, duration, and origin, and prescribes a 150-250ms ease-out transition from scale(0.95) anchored to the trigger. ## Quick Start Review the animation and transition code in this pull request and give me a findings table with a block or approve verdict.
