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Poor web design leads to user frustration and abandonment. This handbook introduces evidence-based academic theories that, when applied to frontend development, transform interfaces from merely functional to cognitively efficient and behaviorally aligned. Learn to minimize friction and guide users seamlessly through their tasks.

This guide demonstrates how frontend developers can use Chrome DevTools to override API responses and headers locally. It covers fixing incorrect data, validating UI scenarios, and resolving CORS errors by manipulating network requests and their properties, enabling continuous development despite backend dependencies.