Foundation · stable · v1.0.0 · owner: Site system lead · contract 19 of 20 points (open: figma)
Reference
Source reference; not an executed check.
display- font.family.stack.display
text- font.family.stack.interface
mono- font.family.stack.figure
displayJa- font.family.stack.display-japanese
sample- font.family.stack.latin
--fs-display- h1, the landing headline
--fs-h2- h2, field verbs, big numbers, long h1s
--fs-h3- h3, card titles, the lede
--fs-body- running text, buttons, inputs
--fs-small- captions, sources, secondary lines, dense UI
--fs-label- measured values: figure keys, token names, scores beside a swatch
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 compact visual role keeps its semantic level
Authored by type.tsRendered consumer example; not an executed correctness check. heading Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Type · Do: A compact visual role keeps its semantic level Use the full-page example to follow page links.
Do: Running text uses the reading role
Authored by type.tsRendered consumer example; not an executed correctness check. text Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Type · Do: Running text uses the reading role Use the full-page example to follow page links.
Don't: Display typography overwhelms a section
Authored by type.tsRendered misuse illustration; not an executed correctness check. heading Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Type · Don't: Display typography overwhelms a section Use the full-page example to follow page links.
Don't: A seventh local type size bypasses the scale
Authored by type.tsRule illustration; not an executed check. type / type.six
.local-section-heading { font-size: 37px; }
A raw local size is introduced rather than an existing semantic type role.Rules
| Rule | Why | Check |
|---|---|---|
| Six sizes, no more. | A small scale makes hierarchy legible at a glance. | Automated: scripts/site/check-brand.ts (font-size only from --fs-* and --type-*) |
| Headings break between whole words (and between phrases in Japanese), never inside a word. | A broken word in a display heading looks like an error (D-SITE-015). | Automated: tests/site (overflow spec at 390 px) and jaBreaks |
| Running text uses Atkinson Hyperlegible Next. | Chosen for low-vision readability. | Review: Owner |
API
No props.
Contract details
The full contract: identity, anatomy, variants, states, tokens, layout, motion, accessibility, content, tests
Identity
| Aspect | Value |
|---|---|
| Id | type |
| Layer | Foundations |
| Category | foundation |
| Owner | Site system lead |
| Status | stable |
| Version | 1.0.0 |
| Source | apps/showcase/site/system/foundations/type.ts (private repository; the contract and the render function are this one module) |
| Version | Date | Change |
|---|---|---|
| 1.0.0 | 2026-10-26 | Type as one module: its markup moved out of the page builder (scripts/site) into the system. |
Use when
- Any text. Why: Six sizes and fixed roles keep hierarchy obvious.
Do not use when
- To add a seventh size for one element. Why: Every new size weakens the hierarchy.
Anatomy
| Part | What it is |
|---|---|
| families | FAMILY in brand.ts |
| sizes | SIZE: display, h2, h3, body, small, label |
| roles | TYPE: display, h1, h2, h3, lede, body, strong, small, small-strong, label, figure |
Made of: nothing (a base element).
Used in: library-overview.
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 |
|---|---|
| --type-display | display · display |
| --type-h1 | display · display |
| --type-h2 | h2 · display |
| --type-h3 | h3 · display |
| --type-lede | h3 · text |
| --type-body | body · text |
| --type-strong | body · text |
| --type-small | small · text |
| --type-small-strong | small · text |
| --type-label | label · mono |
| --type-figure | small · mono |
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 |
|---|---|---|
| headings (Heading / consuming page) | Heading declares display six words, h2 twelve words and h3 eight words; the consuming page owns its exact title | Use sentence case and a clear claim or plain name. Preserve the semantic heading level when choosing an existing visual size; cut words before shrinking type. |
| running text and measured values | The consuming body, caption or data contract's budget | Use Atkinson for running text and Martian Mono for actual values, token names and code. A mono face is not permission to add decorative labels or capitals. |
Good: “The next level of your design system. (Heading's positive wording)” · “--type-h2 (a technical token name, not a decorative label)”
Bad: “OVERVIEW (Heading's rejected capitals)” · “Introducing our innovative solution (Heading's rejected wording)”
Japanese: Japanese headings use Loom JP Display (Noto Sans JP Black, subset) when enabled; phrase breaks come from jaBreaks. Preserve Japanese punctuation and whole phrases, with no negative tracking or forced English-style spaces. Keep code identifiers unchanged and the native-review-pending note; typography guidance is not completed Japanese acceptance.
Icons and illustrations
None: this element uses no icon or illustration of its own.
Decisions and exceptions
Usage
427 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.