Design and code are often managed as separate phases. The result is a handoff boundary where subtle decisions about responsive behavior, loading states, and interaction feedback are rediscovered instead of shared.
A unified workflow does not ask every designer to become an engineer or every engineer to use design tooling in the same way. It gives both disciplines a common set of component names, states, tokens, and acceptance criteria.
Browser prototypes are especially valuable because they expose real constraints early: content wrapping, keyboard behavior, theme changes, and motion timing. These are product decisions, not implementation details.
When the same system informs the design file and the production component, teams spend less time translating and more time improving the experience itself.