Foundation · stable · v1.0.0 · owner: Site system lead · contract 19 of 20 points (open: figma)
Reference
Source reference; not an executed check.
wrap- centred, max 1240 px + gutters
section- --section padding
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 heading and body inside one native wrap
Authored by layout.tsRendered consumer example; not an executed correctness check. titled-section Isolated document follows the browser's colour and contrast preferences. The outer theme toolbar does not control this document.
Open example: Layout primitives · Do: A heading and body inside one native wrap Use the full-page example to follow page links.
Do: The actual page-body structure
Authored by layout.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: Layout primitives · Do: The actual page-body structure Use the full-page example to follow page links.
Don't: A wrap nested inside another wrap
Authored by layout.tsRule illustration; not an executed check. layout / layout.one-wrap
<section class="wrap"><div class="wrap">The same block receives gutters twice.</div></section>Don't: Deferred content removed from the document
Authored by layout.tsRule illustration; not an executed check. layout / layout.progressive-landing
An offscreen section is deleted from the DOM and recreated only after scrolling.
Its headings, anchors, find results and focus targets no longer exist until then.Rules
| Rule | Why | Check |
|---|---|---|
| Only top-level non-hero sections of page-landing opt into content-visibility:auto, with a named approximate block estimate and remembered measured sizes. Hash navigation and print render every section. Otherwise a focused non-hero section and its preceding sibling sections use full geometry for native focus scrolling; following sections retain auto rendering. All DOM content, anchors, find and focus remain available; unsupported browsers render normally. | Long compositions may defer offscreen layout without removing content or changing the approved structure. The estimate is not an actual content-height claim. | Automated: tests/site/progressive-rendering.spec.ts; tests/site/interactives.spec.ts |
| One wrap per block. | Gutters stay 16 / 40 px. | Automated: tests/site (no horizontal overflow) |
API
No props.
Contract details
The full contract: identity, anatomy, variants, states, tokens, layout, motion, accessibility, content, tests
Identity
| Aspect | Value |
|---|---|
| Id | layout |
| Layer | Foundations |
| Category | foundation |
| Owner | Site system lead |
| Status | stable |
| Version | 1.0.0 |
| Source | apps/showcase/site/system/foundations/layout.ts (private repository; the contract and the render function are this one module) |
| Version | Date | Change |
|---|---|---|
| 1.0.0 | 2026-10-26 | Layout primitives as one module: its markup moved out of the page builder (scripts/site) into the system. |
Use when
- Inside every template. Why: One wrap aligns every section's content.
Do not use when
- Nested wraps. Why: A wrap inside a wrap doubles the gutters.
Anatomy
| Part | What it is |
|---|---|
| wrap | .wrap |
| section | .section |
| head | .section-head |
| taskMount | div#app.app, the shared HealthCheck and Survey mount; no intrinsic styles or lifecycle |
Made of: grid.
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 |
|---|---|
| wrap.max | --w-max + 2 × --gutter |
| section.padding | --section |
| section.render-estimate | --section-render-estimate → --w-text (720px approximate placeholder, not a measured height) |
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 |
|---|---|---|
| section heading and introduction (consumer-owned) | Heading and the consuming template's lede/body budgets | Give each section a readable subject and keep the related introduction with it in .section-head. The layout classes do not create headings or supply text. |
| task body in div#app.app | The mounted HealthCheck or Survey contract's content budget | Keep the native task's instructions, controls and recovery text. The mount supplies neither content nor application lifecycle; deferred landing sections must retain their DOM content. |
Good: “What happens next (Heading's section title inside one wrap)” · “One wrap per block, with the section heading before its body (layout.one-wrap)”
Bad: “A nested wrap that doubles the reading gutters” · “Removing a section's text from the DOM to defer its rendering”
Japanese: Japanese headings and body copy come from their consuming templates or task sources, with the same semantic reading order. Allow text expansion inside the existing wrap; do not hide Japanese content to preserve an estimated section height. No translation or task lifecycle API is added, and native/manual review remains separate.
Icons and illustrations
None: this element uses no icon or illustration of its own.
Decisions and exceptions
- None.
Usage
893 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.