Foundation · stable · v1.0.0 · owner: Site system lead · contract 19 of 20 points (open: figma)
Reference
Source reference; not an executed check.
columns- 12
max- "size.container.lg"
text- "size.container.md"
narrow- "size.container.sm"
gutter- {"phone":"space.scale.6","desktop":"space.scale.10"}
gap- {"phone":"space.scale.8","desktop":"space.scale.9"}
section- {"min":"space.scale.11","fluid":"5vw","max":"space.scale.12","factor":1.125}
breakpoint- "size.breakpoint.md"
header- {"phone":"size.scale.64","desktop":"space.scale.13"}
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: One native reading column
Authored by grid.tsRendered consumer example; not an executed correctness check. prose-section Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Grid and layout · Do: One native reading column Use the full-page example to follow page links.
Do: Destination cards share the wrap
Authored by grid.tsRendered consumer example; not an executed correctness check. tile-grid Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Grid and layout · Do: Destination cards share the wrap Use the full-page example to follow page links.
Don't: A desktop width imposed on a phone
Authored by grid.tsRule illustration; not an executed check. grid / grid.no-scroll
.phone-article { width: 1240px; }
The whole document must scroll sideways to read a paragraph.Don't: A heading cropped to fit its column
Authored by grid.tsRule illustration; not an executed check. heading / heading.whole-words
.phone-column h2 { white-space: nowrap; overflow: hidden; }
The final words of the heading disappear.Rules
| Rule | Why | Check |
|---|---|---|
| Nothing scrolls sideways at 390 px. | Horizontal scroll on phones hides content. | Automated: tests/site (no horizontal overflow at 390 px) |
| Every element is checked at 390, 768, 1024 and 1440 px. | The four widths cover phones to large desktops. | Automated: tests/site/system.spec.ts |
API
No props.
Contract details
The full contract: identity, anatomy, variants, states, tokens, layout, motion, accessibility, content, tests
Identity
| Aspect | Value |
|---|---|
| Id | grid |
| Layer | Foundations |
| Category | foundation |
| Owner | Site system lead |
| Status | stable |
| Version | 1.0.0 |
| Source | apps/showcase/site/system/foundations/grid.ts (private repository; the contract and the render function are this one module) |
| Version | Date | Change |
|---|---|---|
| 1.0.0 | 2026-10-26 | Grid and layout as one module: its markup moved out of the page builder (scripts/site) into the system. |
Use when
- Every section's wrap and columns. Why: One grid aligns every page.
Do not use when
- Full-bleed fields. Why: Fields span the viewport; their content sits in the wrap.
Anatomy
| Part | What it is |
|---|---|
| wrap | .wrap (layout foundation) |
| columns | 12 from 960 px |
| gutters | 16 / 40 px |
Made of: nothing (a base element).
Used in: layout.
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 |
|---|---|
| --w-max | 1240 px content |
| --w-text | 720 px text |
| --gutter | 16 / 40 px |
| --grid-gap | 24 / 32 px |
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 |
|---|---|---|
| reading text and figures in grid columns | The consuming element's copy budget; running text uses --w-text and forms/ledes --w-narrow | Keep argument and evidence in reading order. Shorten an overlong heading before changing the type scale; do not crop text to fit a column. |
| layout names and values (fixed Library specimen) | The complete LAYOUT entry serialized from brand.ts; no editable slot | Retain native widths, gutters and breakpoint values. These rows describe layout policy, not executed viewport results. |
Good: “Running text at --w-text, with its figure in the remaining columns (BRAND.md)” · “Forms and ledes at --w-narrow (BRAND.md)”
Bad: “A heading cut off at the edge of a phone column” · “A desktop-width paragraph forced to scroll with the whole page”
Japanese: Japanese text uses the same grid with phrase-aware heading breaks from its existing source. Allow real Japanese content to grow and recheck narrow layouts without shrinking type or clipping words. Keep layout identifiers unchanged; this policy is not a Japanese rendering or native-review result.
Icons and illustrations
None: this element uses no icon or illustration of its own.
Decisions and exceptions
- None.
Usage
39 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.