Foundation · stable · v1.0.0 · owner: Site system lead · contract 19 of 20 points (open: figma)
Reference
Source reference; not an executed check.
radius- radius.control
round- radius.pill
sample- radius.scale.3
hair- size.border.thick
rule- size.border.rule
frame- size.thread
heavy- size.scale.8
Do and don't
2 positive / 2 negative authored documentation examples (2 each required); 1 reference (1 required); 0 failed. References and failures do not count; this is not behavior acceptance.
Do: A native action keeps its control radius
Authored by radius.tsRendered consumer example; not an executed correctness check. button Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Radius and rules · Do: A native action keeps its control radius Use the full-page example to follow page links.
Do: A square evidence frame keeps its caption
Authored by radius.tsRendered consumer example; not an executed correctness check. figure-frame Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Radius and rules · Do: A square evidence frame keeps its caption Use the full-page example to follow page links.
Don't: The evidence panel becomes a rounded card
Authored by radius.tsRule illustration; not an executed check. radius / radius.square
.visual { border-radius: var(--round); }
A figure adopts the pill shape intended for other roles.Don't: Rounded clipping removes the source caption
Authored by radius.tsRule illustration; not an executed check. figure-frame / figure.caption
A figure is given a fixed rounded clipping box; its source caption falls outside the visible area.
Only the drawing remains readable.Rules
| Rule | Why | Check |
|---|---|---|
| Fields, panels and figures have no radius. | Square cloth is part of the look. | Automated: scripts/site/check-brand.ts (radius only from tokens) |
API
No props.
Contract details
The full contract: identity, anatomy, variants, states, tokens, layout, motion, accessibility, content, tests
Identity
| Aspect | Value |
|---|---|
| Id | radius |
| Layer | Foundations |
| Category | foundation |
| Owner | Site system lead |
| Status | stable |
| Version | 1.0.0 |
| Source | apps/showcase/site/system/foundations/radius.ts (private repository; the contract and the render function are this one module) |
| Version | Date | Change |
|---|---|---|
| 1.0.0 | 2026-10-26 | Radius and rules as one module: its markup moved out of the page builder (scripts/site) into the system. |
Use when
- Controls, chips and dividers. Why: Cloth is square; rounding is kept for things you press.
Do not use when
- Rounded cards or fields. Why: Fields and panels are square, like cloth.
Anatomy
| Part | What it is |
|---|---|
| radius | --radius (controls), --round (pills) |
| rules | --rule-hair, --rule, --rule-frame, --rule-heavy |
Made of: nothing (a base element).
Used in: pages directly.
Variants
| Variant | When | Why |
|---|---|---|
| light and dark | Every page, following the reader's setting. | The same roles resolve to light or dark values, so no element chooses its own. |
States
| State | Rendered or not applicable |
|---|---|
| default | The specimen. |
| hover | Not applicable: A foundation is not interactive. |
| focus-visible | Not applicable: Not focusable. |
| active | Not applicable: Not interactive. |
| disabled | Not applicable: Nothing to disable. |
| loading | Not applicable: Values are built into the stylesheet. |
| empty | Not applicable: The build fails if a value is missing. |
| error | Not applicable: Unresolved values fail the brand gate, not the reader. |
| current | Not applicable: No current item. |
| visited | Not applicable: Not a link. |
| expanded | Not applicable: Does not open. |
Tokens
| Part | Token |
|---|---|
| --radius | radius.control |
| --round | radius.pill |
| --rule | size.border.rule |
| --rule-heavy | size.scale.8 |
Layout
| Aspect | Value |
|---|---|
| breakpoints | Required review at 390, 768, 1024 and 1440 px; execution is not implied by this declaration; columns stack under 768 px; the wrap keeps a 16 px gutter on phones. |
| wrapping | Text wraps; nothing scrolls sideways. |
| textExpansion | Japanese runs 20 to 40% longer; headings break between phrases (jaBreaks) and blocks grow downwards. |
Spacing and rhythm
| Aspect | Value |
|---|---|
| internal | Not applicable: a foundation has no box of its own. |
| external | Not applicable. |
| rhythm | Applies to every element that reads it. |
Motion
| Aspect | Value |
|---|---|
| None | A foundation does not move. |
Runtime and reuse
Render-only element; mount any registered child enhancements separately. Preserve required Site CSS, fonts, responsive and locale rules from nativeElement.
Accessibility passport
| Aspect | Value |
|---|---|
| role | Not rendered on the site; its specimen in the Library is a list |
| name | The foundation's name |
| keyboard | Not interactive. |
| focus | Not focusable. |
| screenReader | The specimen is a plain list of names and values. |
| contrast | Every text and ground pair in the palette is checked (check-brand). |
| target | Not a target. |
Content
| Slot | Length | Voice |
|---|---|---|
| words inside controls or beside state marks (consumer-owned) | The Button, Control or BandWord contract's existing budget | Keep the action or band name readable. A rounded outline or a heavy rule supplies shape, not a label, and cannot justify trimming the words. |
| radius and rule names/values (fixed Library specimen) | The complete RADIUS and RULE entries from brand.ts | Retain the native radius and rule vocabulary. These are design values with no editable wording props. |
Good: “Settings page (Control's named preset inside its control outline)” · “A square figure under the --rule-frame top rule (BRAND.md)”
Bad: “An unnamed round control with only its shape to explain the action” · “A rounded proof figure with its caption clipped to the frame”
Japanese: Translate labels through their consuming components and allow their documented Japanese expansion. Do not abbreviate Japanese band names merely to fit a pill. Keep radius/rule identifiers unchanged; shape tokens do not supply locale behaviour, and native-language review remains open.
Icons and illustrations
None: this element uses no icon or illustration of its own.
Decisions and exceptions
- None.
Usage
142 owned-class occurrences in built pages plus metadata-token references in built CSS (measured by npm run site:system).
No application mechanism is declared.
Current check result: not assessed by this report. Declarations and source-file presence do not establish executed enforcement or accepted coverage.
Tests
| Aspect | Value |
|---|---|
| unit | tests/unit/site-system.test.ts: renders every do and don't example through the registry and checks the classes it owns |
| visual | Not yet: there are no screenshot baselines; the Library page is checked for sideways scroll at 1440 px by tests/site/system.spec.ts |
| a11y | tests/site/system.spec.ts: axe (0 serious or critical) on the element's Library page in light and dark |
| parity | scripts/site/system/check.ts: Library examples are rendered by the same render function the site imports |
Figma
not-yet: The Loom Site Figma library is the last stage of the plan; this element is not mapped yet.