frontend-patterns/reference/0.1/Catalog.md

Candidate reference — 0.1

All records are draft hypotheses. Classification is provisional; linked candidate prose contains context, alternatives and consequences. Evidence locators describe partial support, not full-contract recurrence.

Core

Candidate / decision	Families; scales	Evidence limits
CAND-0001 — Conflict Copy — Preserve competing versions instead of silently losing one.	synchronization; L2, L6	Authorized retention and export are separate decisions. Complete contract recurrence and fault-tested deployed behavior remain unverified.
CAND-0002 — Local Commit Boundary — Define when a local change is durably accepted.	mutation, authority; L2, L6	No executed storage crash or backup test. Local acceptance is not off-device recovery.
CAND-0003 — Pending Synchronization — Keep accepted local intent visible until synchronization resolves.	synchronization; L2, L6	Atomic supersession and retry contract proposed, not storage-tested.
CAND-0004 — Explicit Reconciliation — Resolve divergent content while retaining provenance.	synchronization, affordance; L2, L6	Atomic resolution/provenance UI not executed. Overlap with Conflict Copy remains an open merge question.
CAND-0005 — Local Draft State — Separate unfinished intent from refreshed authoritative data.	affordance, mutation; L6	No native-unload, crash, multiple-tab or access-revocation guarantee. Full base/draft/current merge contract is not verified in deployed frontends.
CAND-0006 — Version-Checked Mutation — Reject an operation whose observed base is stale.	mutation, authority; L2, L6	Distributed atomicity and complete frontend recurrence remain unverified. Refetch does not authorize overwriting conflicting intent.
CAND-0007 — Mutation Outcome Tracking — Retain operation identity when transport outcome is uncertain.	mutation, synchronization; L2, L6	No production server deduplication or complete retention-window guarantee. Cancelling local UI is not remote compensation.
CAND-0008 — Invalidate and Reproject — Refresh a projection after mutation without equating acceptance and visibility.	projection, synchronization; L3, L6	Read-your-write and acceptance/refresh distinction still proposed. No independent deployed full-contract observation.

Extensions

Candidate / decision	Families; scales	Evidence limits
CAND-0009 — URL-addressable State — Make a navigable state reconstructible from its URL.	address, projection; L3	Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip auxiliary target/anchor callbacks, deferred editing focus and search callback wiring remain unverified; static guards do not prove whole-application ownership.
CAND-0010 — Progressive Enhancement — Keep essential actions usable when enhancement is unavailable.	quality, execution, affordance; L3, L6	Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip auxiliary target/anchor callbacks, deferred editing focus and search callback wiring remain unverified; static guards do not prove whole-application ownership.
CAND-0011 — Presentation Model — Separate presentation decisions from view mechanisms.	composition, affordance; L4, L6	No executed model/view integration or independently reviewed full-contract use.
CAND-0012 — Derived State — Compute a result from explicit authoritative inputs.	projection, affordance; L3, L6	Snapshot coherence and changed-locale cache test still planned.
CAND-0013 — Vertical Feature Slice — Group a capability across UI, state and behavior with explicit interfaces.	composition; L4	Build/import enforcement not executed. Feature organization does not establish independent activation.
CAND-0014 — Islands of Interactivity — Activate selected interactive regions within a document.	projection, execution; L3, L5	No executed island fixture, performance comparison or complete recurrence study.
CAND-0015 — Failure Boundary — Contain specified failure classes while preserving useful neighboring work.	quality, composition; L5, L6	Synthetic host, not full application recurrence. Boundary cannot imply containment for all asynchronous failures.
CAND-0016 — Focus Return — Restore meaningful focus after a temporary interaction ends.	quality, affordance; L6	One implementation family; repeated trials are not independent uses. Animated exits and competing owners remain untested; no production repair claim. Route ownership is a contrast, not independent modal recurrence; AT speech and broader history/lifecycle cases remain unverified. Zulip auxiliary target/anchor callbacks, deferred editing focus and search callback wiring remain unverified; static guards do not prove whole-application ownership.
CAND-0017 — Independent Feature Boundary — Separate feature release, activation and session transition contracts.	composition, execution; L1, L4	No upstream deployment or real team/release-independence validation. Distributed atomicity, retention authorization and native-unload/crash behavior remain open.

Extensions are optional research leads. VC-03/06 remain provisional; other planned cases are unsupported. Follow the starting guide for the two core contexts.