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ARC 2.0.0-beta.28 · AUP Web-only widget

app-header

AUP Web-only widget `app-header`: purpose, boundaries, surfaces, fallback, and evidence.

AUP Web-only widget — not a cross-device primitive; not a Web Device layout component.

The name is registered in AUP_WIDGETS (packages/aup/src/aup-types.ts). It can be accepted by structure verification and implemented by a Web runtime (or native target where noted). It is not one of the 18 cross-device AUP_PRIMITIVES, does not enter DeviceCaps.primitives via fillPrimitives, and is not a Web Device theme/site layout component (for example content-card or page-breadcrumb).

Purpose

Brand shell header — server-driven navigation chrome. Renderer emits AUP events rather than owning client-side routing policy.

Boundaries

  • Do not document this type as a portable primitive.
  • Do not mix it with Web Device layout-component reference pages under widgets/.
  • A parser-accepted name is not a portability or product-readiness claim.

Author entry

AUP app shell type: "app-header". Showcase prim-app-header, session, session-chrome.

Surfaces

Interactive Web + document RENDERERS. Site layout portal-header is a different layout-component.

Fallback

No shared degradation chain.

Evidence

SourcePath
Registrationpackages/aup/src/aup-types.ts
Registryproviders/runtime/ui/src/aup-registry.ts (app-header)
Interactive rendererproviders/runtime/ui/src/web-page/renderers/app-header.ts
Document rendererproviders/runtime/web-device/src/renderer/primitives/app-header.ts; RENDERERS in render-to-html.ts
Showcaseblocklets/showcase/.aup/pages/prim-app-header.json

Paths are relative to the Arc repository checkout used for this documentation baseline.

Sample

No docs-safe live sample on this site yet. Use the listed Showcase source / factory API as a source-only reference. Run Showcase locally if you need interactive acceptance.

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