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

blocklet-embed

AUP Web-only widget `blocklet-embed`: 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

Embeds another blocklet page tree into the host tree. Expanded server-side by portal-setup / expandTree; failure is always visible (never blank).

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 tree type: "blocklet-embed" with target blocklet identity. Not a layout-component.

Surfaces

Interactive Web session after server expansion. Unexpanded client sees unknown type.

Fallback

Expansion error node (visible). No shared degradation chain.

Evidence

SourcePath
Registrationpackages/aup/src/aup-types.ts
Expansionproviders/runtime/ui/src/portal-setup.ts (blocklet-embed expand path)
Path safetyproviders/runtime/ui/src/path-safety.ts
Testsproviders/runtime/ui/test/blocklet-embed*.test.ts

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

Sample

Not docs-safe. Side effects, write paths, native-only surfaces, or trust-sensitive endpoints make a public sample inappropriate. Keep this page as a boundary and evidence index.