Defines user-visible behavior, states, transitions, errors, and edge cases for application shell. This reference fixes the adoption boundary, failure behavior, and observable evidence while leaving environment-specific limits configurable.
Package status: reference context ready for human review. The contract and test scenarios are complete, but no claim is made that an adopting implementation has passed them.
Decision
For Application shell, adopt a typed user-state model with server data kept distinct from transient view state. Define a deterministic user journey with visible state, reversible choices where possible, preserved input, and accessible recovery. This ux block focuses specifically on user behavior specification. This package is a reference contract: the adopting team must choose numeric limits, providers, jurisdictions, and operational owners from evidence in its own environment.
Scope
- The Application shell actors, inputs, outputs, states, policy or schema versions, and externally visible outcomes required for the user behavior specification focus of this ux block.
- Primary and alternate interfaces, background work, caches, integrations, support paths, and evidence that can exercise the same boundary.
- Adoption-specific configuration, rollout, recovery, and verification responsibilities needed to apply the reference safely.
Outside this block
- Choosing a universal vendor, framework, jurisdiction, numeric threshold, retention period, or service-level objective for every adopter.
- Claiming that packaged scenarios have run against a downstream implementation or that this reference grants legal, security, or accessibility certification.
Contract
- Represent loading, empty, ready, stale, offline, validation, authorization, and dependency errors explicitly where they can occur.
- Keep the URL, server record, and component state synchronized through named ownership rules instead of mirrored mutable copies.
- Preserve keyboard operation, focus, labels, announcements, zoom, and reduced-motion behavior across responsive layouts.
- Cancel or ignore obsolete asynchronous work so an older response cannot overwrite a newer user intent.
- Show progress only while work is actually pending and prevent duplicate activation without hiding the user's committed intent.
- Use plain, action-specific messages that distinguish validation, permission, connectivity, conflict, and terminal failure.
- Make authentication, tenant context, navigation, routing, global loading, offline state, error boundaries, updates, and accessibility landmarks explicit shell responsibilities.
- Load the smallest usable frame first, isolate feature failure, preserve title, focus, history, and scroll across navigation, and never flash unauthorized content during bootstrap.
- For the user behavior specification variant, enforce this declared boundary: defines user-visible behavior, states, transitions, errors, and edge cases for application shell.
Implementation guidance
- Prototype the longest, empty, slow, offline, denied, and assistive-technology paths before locking the happy-path layout.
- Model Application shell inputs, outputs, actors, states, invariants, side effects, and evidence before selecting framework or vendor details.
- Store the applicable Application shell contract or policy version with material state so migrations, replay, and support decisions remain attributable.
- Introduce the path behind controlled rollout, compare expected and observed outcomes, and keep a tested recovery route until adoption evidence is complete.
Failure handling and safeguards
- A failed request preserves recoverable input, identifies the affected operation, and offers only retries that are safe for that operation.
- Invalid or contradictory Application shell state is rejected or quarantined; the implementation never guesses a value that broadens authority or duplicates an effect.
- Retries are bounded and use durable identity; after exhaustion, work reaches an inspectable terminal state with an accountable owner.
Verification and operations
- Complete the journey with keyboard, touch, screen reader, narrow viewport, delayed network, and a recoverable server error.
- Monitor Application shell success, denial, validation failure, dependency failure, retry exhaustion, and recovery by contract version without sensitive payload dimensions.
- Re-run paired positive and negative fixtures after policy, schema, dependency, migration, or boundary changes and preserve the resulting evidence.
Adoption assumptions
- Names and values in the example are a concrete fixture, not universal defaults; adopters replace them through documented evidence and ownership.
- The adopting system can provide authenticated identity, durable operation or record versions, bounded telemetry, and a controlled path for change.
The executable-looking examples in this package are fixtures and acceptance contracts. Run the collection validator to check structure and metadata, then translate and execute the scenarios in the target repository before recording implementation evidence.