Aspect Ratio
A single block-level wrapper that reserves space by ratio (CSS `aspect-ratio`) and stretches to the parent's width. Use it as the *frame* for media that arrives async — images, video, embeds, charts — so the surrounding layout never shifts…
Preview
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.
npx shadcn@latest add https://ds.interlace.tools/r/aspect-ratio.jsonnpx shadcn@latest add @interlace/aspect-ratioHistory
This component is at v1.1.0, 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.
No release note names this component yet. It shipped with the release above and has not changed since — see the full changelog for what moved elsewhere in the DS.
Import
2 named exports — pull the parts you need.
import { AspectRatio, MIN_VIEWPORT } from '@/components/ui/aspect-ratio';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.
AspectRatioProps
Also accepts every <div> attribute.
| Prop | Type | Description |
|---|---|---|
| ratio | number | Width / height ratio (e.g. 16 / 9, 4 / 3, 1). @default 16 / 9 |
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
3 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.
| Rule | Concept | Where |
|---|---|---|
| R4 | Extends native el | `React.ComponentProps<'div'>` |
| R6 | data-slot on the part | `data-slot="aspect-ratio"` |
| R7 | className merged + ...rest + ref | `cn('relative w-full', className)` + `{...props}` + `forwardRef` |
| R11 | One variable | One layout variable: `ratio` (number) |
| R18 | Tailwind only — except aspect-ratio | Inline `style={{ aspectRatio: ratio }}` is unavoidable here — Tailwind has no class for an arbitrary runtime ratio short of `aspect-[w/h]` JIT, which can't accept a runtime number. This is the documented carve-out. |
| R19 | Tokens only | No color/spacing/radius/type — pure layout primitive |
| R25 | Server component | No hooks; safe inside any RSC tree |
Minimum viewport
This primitive declares MIN_VIEWPORT = 320 CSS px (DESIGN_PRINCIPLES #14). When mounted in a container narrower than this, the preflight contract draws a dev-mode outline so the regression is visible during local development.
<body data-interlace-dev>...</body>
Add the data-interlace-dev attribute to the body in development builds only — preflight then outlines any primitive whose container is below its declared data-min-viewport.
Dependencies
- Base UI primitive
- Native / no Base UI dependency
- Lucide icons
- none
- NPM dependencies
- none
- Registry dependencies
Source
The full implementation — components/ui/aspect-ratio.tsx once installed.
import * as React from 'react';
// @interlace/aspect-ratio v1.1.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/aspect-ratio
// What changed since: https://ds.interlace.tools/c/aspect-ratio#history
// Generated banner — keep it, the upgrade diff reads this version.
/**
* @interlace/ui — AspectRatio
*
* A single block-level wrapper that reserves space by ratio (CSS
* `aspect-ratio`) and stretches to the parent's width. Use it as the *frame*
* for media that arrives async — images, video, embeds, charts — so the
* surrounding layout never shifts (DESIGN_PRINCIPLES #7, "CLS = 0 from
* layout").
*
* Anatomy: one `div`. Children fill the frame absolutely, or with
* `object-cover` on `<img>` / `<video>`.
*
* | Rule | Concept | Where in this file |
…49 more lines…Registry JSON
The raw registry record — what the shadcn CLI fetches.