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
Window-manager container for multi-surface desktop/panel layouts inside an interactive AUP Web session.
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 type: "wm" with wm-surface children and strategy/dock props. Showcase wm-desktop.
Surfaces
Interactive Web session only.
Fallback
No shared degradation chain. Complex session semantics — not a static sample.
Evidence
| Source | Path |
|---|---|
| Registration | packages/aup/src/aup-types.ts |
| Registry | providers/runtime/ui/src/aup-registry.ts (wm examples) |
| Renderer | providers/runtime/ui/src/web-page/renderers/wm.ts |
| Session logic | providers/runtime/ui/src/aup-wm-session-logic.ts; wm-layout.ts |
| Showcase | blocklets/showcase/.aup/pages/wm-desktop.json |
Paths are relative to the Arc repository checkout used for this documentation baseline.
Sample
Internal / experimental for public samples. Registration and renderers exist in the interactive Web runtime (and sometimes Web Device widget packages), but this site does not ship a docs-safe live sample. Do not infer product readiness from the type name alone.
Related
- Widgets hub — navigation only
- Primitive taxonomy — 18 vs 42 boundary
- Custom primitives and Web widgets
- Internal matrix:
docs/aup/capability-matrix.md - Showcase route (local ARC):
wm-desktopunderblocklets/showcase