Don't Panic — Design-to-Development Handoff

A design-to-development handoff is not a ceremonial launch of screens over a wall. It is an implementable agreement: what a person is trying to do, how the interface changes while they do it, what limits apply, and what counts as finished. The screens are still invited. They are not, however, qualified to run the entire meeting.

The awkward surprise is that a polished frame shows one moment, while an interface has a small, energetic population of moments. A state is one of those conditions: loading, empty, focused, invalid, disabled, successful, or broken. If the handoff names only the pleasant one, the implementation team must invent the rest. Invention is useful for novels and considerably less useful for error recovery.

The second anchor is a responsive rule, meaning the behavior that connects sizes rather than two screenshots at the ends of the universe. A region may grow, wrap, stack, collapse, reorder, hide, scroll, or hold position. State the condition and the priority that causes the change. That leaves less room for a breakpoint to become an archaeological site where everyone digs for intent.

Then connect the design to the system that must carry it. Map a design component to a code component, a variant to a supported property, and a named token to its implementation token. Record exceptions. Add the accessibility decisions too: semantic intent, accessible name, keyboard operation, focus order, and recovery. Measurements can be inspected; a decision still needs to be made by people with coffee and consequences.

Read the Intro when the agreement needs its full shape. Use Slides for the map of intent, states, constraints, and evidence. Keep the Cheatsheet nearby while assembling a packet, and use the Practice Reference to rehearse the review. The Quiz tests the judgment calls. The exercise asks you to make a handoff another person can actually inspect, which is where the paperwork stops being paperwork.