Separator

Base Separator is a contentless, non-interactive boundary for horizontal or vertical separation. It owns orientation and whether the separator is decorative; layout, color, thickness, and rhythm belong to the design language.

@proto.ui/prototypes-base/separator exports separatorRoot and asSeparatorRoot(). Current props are:

• orientation?: 'horizontal' | 'vertical', defaulting to horizontal;
• decorative?: boolean, defaulting to true.

The root exposes orientation and decorative state. It intentionally exposes no focus, tab stop, event, command, activation, or mutable-value channel, and its renderer is contentless so decorative semantics cannot accidentally hide authored descendants.

Decorative mode is hidden from the accessibility tree and emits neither separator role nor orientation state. Semantic mode projects role="separator" and the corresponding orientation. Whether a divider is meaningful to assistive technology is an authoring decision, not a styling side effect.

The stable 0.2.0 package exports the Separator subpath, and the CLI registry exposes base-separator. T-BASE-SEPARATOR-0001 maps the protocol to packages/prototypes/base/test/separator.test.ts; the preview verifies both decorative and semantic cases across the Web adapters.

P-BASE-SEPARATOR is draft. Its small surface is fully evidenced, but it has not been promoted to an active protocol guarantee.

• P-BASE-SEPARATOR
• Separator source
• Separator evidence
• Styled projection: Brutalist Separator