Section Header

The "section intro" block — optional eyebrow, a heading, and a `max-w-prose` tagline — with the bottom margin, the alignment and the type rhythm owned in one place instead of being re-typed as `text-center mb-12` on every section.

navigationserveruiv1.2.0

Preview

Section Header — live renderblocks-sectionheader--default

Rendered from the story the storybook (a11y) CI gate runs axe against — the preview can't show something that hasn't been verified.

Install

Two equivalent paths — the URL works in any shadcn-CLI setup; the alias works once you've registered @interlace in your components.json.

Via shadcn URL
npx shadcn@latest add https://ds.interlace.tools/r/section-header.json
With the @interlace alias
npx shadcn@latest add @interlace/section-header

Behavior

What this component does — the keyboard path, the measured colour, the text equivalent and the states it can be in. Every figure below is read out of the test or the source that enforces it by scripts/build-behavior-map.mjs, so nothing here can outlive the gate that keeps it true.

Every semantic colour pair this component's own source uses, measured against the shipped hexes in all 4 theme × scheme combinations. The tightest is muted-foreground on background at 7.82:1 (harbor · light), against a floor of 4.5:1.

Measured WCAG contrast ratios per token pair and theme
PairinterlacelightinterlacedarkharborlightharbordarkFloor
muted-foreground on backgroundsecondary copy9.41:111.32:17.82:19.52:14.5:1SC 1.4.3
muted-foreground on cardsecondary copy in a card9.41:110.48:18.25:18.64:14.5:1SC 1.4.3

Text pairs are held to 4.5:1 (WCAG 2.2 SC 1.4.3); borders, rings and chart axes to 3:1 (SC 1.4.11 non-text). Bold is the worst cell in the row — the one a brand fork has to keep an eye on.

Where it renders, how narrow it survives, and whether its lines are inside the coverage gate — three answers a consumer needs before the paste, not after the bug.

Render boundary
server component

Renders during SSR / RSC with no hydration cost. It can be imported from a server component without pulling the page into the client.

Minimum viewport
none declared

No width floor: it takes the width it is given. Its container owns the layout question.

Coverage gate
not in the gate

The 100% gate currently covers src/charts/**/*.{ts,tsx} and src/lib/**/*.{ts,tsx} and src/primitives/{button-variants,data-state-model,meter-scale,skeleton-variants}.ts and src/primitives/{alert,aspect-ratio,avatar,badge,box,breadcrumb,button,callout,card,checkbox,container,data-state,focus-ring,grade-badge,grid,input,label,meter,pagination,published-date,reading-time,section,section-boundary,separator,skip-link,stack,stat-strip,tag,textarea,typography,visually-hidden}.tsx. This file is outside it — the glob widens in phase 7.2.

History

This component is at v1.2.0, first shipped in @interlace/ui 1.0.0. The version is stamped as a banner into the file the install writes, so the copy in your tree says which one you have — compare it with the number above before deciding whether to re-run the install.

@interlace/ui 1.1.01 entry

Import

3 named exports — pull the parts you need.

Public API
import { SectionHeader, sectionHeaderEyebrowVariants, sectionHeaderVariants } from '@/components/ui/patterns/section-header';

Anatomy

Extracted from the primitive's JSDoc header. The source is the only documentation that can't drift.

SectionHeader                    (div — data-slot="section-header", data-align)
    ├─ div                         (data-slot="section-header-eyebrow")
    ├─ h1 | h2 | h3                (title — `text-3xl md:text-4xl lg:text-5xl`)
    └─ p                           (tagline — `text-muted-foreground max-w-prose`)

Variants

Closed prop unions enforced by class-variance-authority. See Storybook's Variants story for the rendered matrix.

  • align
    • centerdefault
    • start

API reference

Parsed from the type declarations in the source — the same file the install writes into your tree, so this table can't drift from the component you get.

SectionHeaderProps

Also accepts every <div> attribute. Plus the variant props listed above.

PropTypeDescription
eyebrowReact.ReactNodeSmall label above the title (e.g. a section number, chip, or eyebrow tag).
title*React.ReactNodeThe h2 heading.
taglineReact.ReactNodeOptional subhead paragraph.
as'h1' | 'h2' | 'h3'Heading level. Defaults to h2 (page-level h1 lives in the hero).

Accessibility

Every story for this component is rendered headlessly and checked with axe-core (wcag2aa, wcag22aa, best-practice, ACT) on every PR. That gate has no continue-on-error, so what ships has zero known violations.

What follows is what static analysis can see. Axe cannot press a key and never sees an overlay open, so the operable-without-a-mouse claim lives in Behavior instead, where the keyboard path is replayed step by step.

Focus + keyboard behaviour
Native element semantics — no interaction layer to get wrong.
Focus ring (WCAG 2.2 SC 2.4.13)
Not focusable — no focus indicator required.
Reduced motion
No animation to gate.
ARIA in the source
None — semantics come from the element or the Base UI primitive rather than hand-written ARIA.

Examples

4 more states from the same story file.

R-rule compliance

Every primitive in @interlace/ui models to the portable 26-rule floor enforced by the componentApi ESLint preset. The cells below pin exactly where each rule applies in this file.

RuleConceptWhere
R4Extends native el`Omit<React.ComponentProps<'div'>, 'title'>`
R6data-slot on root`data-slot="section-header"` + `data-align`
R7cva + cn + ...rest`cn(sectionHeaderVariants({align, spacing}), className)`
R8Enums, not booleans`align = center\
R10Composition seams`eyebrow` / `title` / `tagline` are `ReactNode`
R18Tailwind onlyzero inline `style`
R19Tokens only`text-muted-foreground`; no palette escapes
R25Server componentno hooks → no `'use client'`

Dependencies

Base UI primitive
Native / no Base UI dependency
Lucide icons
none
NPM dependencies
  • class-variance-authority
Registry dependencies

Source

The full implementation — components/ui/patterns/section-header.tsx once installed.

144 lines · TypeScript
import * as React from 'react';

// @interlace/section-header v1.2.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/section-header
// What changed since: https://ds.interlace.tools/c/section-header#history
// Generated banner — keep it, the upgrade diff reads this version.

/**
 * @interlace/ui — SectionHeader
 *
 * The "section intro" block — optional eyebrow, a heading, and a `max-w-prose`
 * tagline — with the bottom margin, the alignment and the type rhythm owned in
 * one place instead of being re-typed as `text-center mb-12` on every section.
 *
 * It is the LAYOUT_PHILOSOPHY §1 pattern lifted into a component.
 *
 * ## Anatomy
 *
 *   SectionHeader                    (div — data-slot="section-header", data-align)
 *     ├─ div                         (data-slot="section-header-eyebrow")

…124 more lines…

Registry JSON

The raw registry record — what the shadcn CLI fetches.