---
term: stack
category: surface-system
status: canonical
authority: surface.elonn.local
---

Stack

An ordered collection of surfaces with one focus surface. A stack is a presentation organizer; it does not own the surfaces it contains.

Allowed:
- stack
- surface stack
- carry stack
- stack order
- focus surface
- neighbor surface

Forbidden:
- tab set
- page list
- sidebar pages
- menu screens

Notes:
- A stack preserves surface order and focus.
- Surfaces may leave a stack and become docked, detached, shared, or field-anchored without changing identity.
- Runtimes choose how to render stack motion.