Host and UI
Product interaction, composition, and shared presentation contracts.
HEAD a63778eLoad only the contract that owns the changed surface:
| Read this page when | A user-visible interaction, layout, visual token, dialog, icon, or product copy changes. |
|---|---|
| First answer | Which shared Host or UI contract governs the surface? |
| Boundary | Business rules remain with the owning domain; this route owns presentation and interaction composition. |
| Follow-up | Choose the surface route below, then follow its implementation and verification authority. |
| Question | Contract |
|---|---|
| Form factor, chrome placement, or usable canvas geometry | Editor Chrome |
| Canvas color inspection or structured layer eligibility | Canvas Inspector |
| Tokens, recipes, primitives, surfaces, or layers | Visual system |
| Visible product copy or localization | Interface content |
| Modal composition | Dialog surfaces |
| Host control geometry, icon, or state | Core Host icon controls |
Business rules remain with the owning domain; verification routes are selected by the changed contract in Quality.