Study Shows Uncontrolled AI-Generated Code Causes UI and Accessibility Drift

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A browser-verified experiment compared uncontrolled AI-generated React and Tailwind code against Toolcrib v0.5.0, a pre-tested component library, to assess the risks of 'vibe coding' in frontend development. The rerun, conducted using Puppeteer, found that Toolcrib v0.5.0 resolved all four major behavioral gaps identified in the previous v0.4.0 action plan, including fixes for keyboard navigation, accessible error states, and cursor affordance issues. When an AI assistant was asked to build a deletion confirmation dialog without a component floor, it introduced 11 new raw elements and repeated known accessibility bugs, requiring 86 lines of custom infrastructure code to fix. In contrast, Toolcrib v0.5.0 handled the same request with zero new styling attributes while maintaining a fully accessible, tested foundation. The findings suggest that AI coding assistants, without a structured component baseline, are likely to reproduce accessibility and UI consistency errors across iterations.

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