AI-Generated UIs Often Skip Reduced-Motion Accessibility, Tool Aims to Fix That

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AI coding tools frequently produce visually rich, animation-heavy interfaces but rarely include a prefers-reduced-motion fallback, posing real risks for users with vestibular disorders who can experience dizziness or nausea from parallax and zooming effects. WCAG success criteria 2.2.2 requires that automatically moving content lasting over five seconds must be pausable or stoppable, a baseline standard that most AI-generated motion fails by default. The core issue is that prompting an AI model to be accessible offers no guarantee, since output varies across runs and static analysis tools like axe-core cannot reliably detect missing reduced-motion paths in dynamic interfaces. To address this gap, a new open-core tool called MotionSpec treats motion as a declarative data spec, enabling deterministic, automated checks that can be called by AI agents before generated UI is shipped. The MIT-licensed npm package includes 40 motion primitives and 373 automated tests, and runs as both an HTTP API and an MCP server on Cloudflare Workers, with a free no-signup motion check available at motionspec.dev.

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