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§01
Contract
Semantics first
Anatomy
Renders section; authors must supply a heading or an accessible label when the band is a distinct document section.
Consumer classes, styles, and data attributes may extend the surface, but required roles, IDs, relationships, and handlers remain owned by the component.
Keyboard
No custom keyboard contract; focus remains in source order.
§02
Public surface
API & styling
Props
id
Explicit IDs override stable generated IDs.
class / style
Consumer additions compose with required styles.
ref
Element or callback where focus control is expected.
children
Typed content; raw HTML strings are never rendered.
Slots & events
children
Primary content slot.
onChange
Typed value plus a small reason object when state changes.
There is no stable predecessor for this explicit compiled subpath. The v1 compatibility layer remains tested separately; visual and API diffs begin with the next prerelease.