# Logo

> Logo atom; the Digitaltableteur mark by default (monochrome currentColor, square footprint, optional controlled pulse), or any custom PNG/JPEG/SVG logo via src.

- Status: stable
- Group: display
- Page: https://www.digitaltableteur.com/design-system/components/logo
- Contract: https://www.digitaltableteur.com/contracts/v1/Logo.contract.json

## When to use

The logo atom. Renders the Digitaltableteur mark by default; monochrome via currentColor so it inherits the surface's ink, square footprint. It renders only an svg or img and has no link prop; to make a home link, wrap it in a link. Pass src to render any custom logo image (PNG, JPEG, or SVG) inside the same square box.

## When not to use

The contract records no forbidden uses.

## Look-alikes

The contract names no look-alike with a deciding condition.

## Props

| Prop | Type | Default | Description | Required |
| --- | --- | --- | --- | --- |
| `src` | `string` | none | Optional image URL (PNG, JPEG, or SVG) rendered instead of the built-in Digitaltableteur mark. `title` becomes the alt text; `animated` and `background` apply to the built-in mark only and are ignored when `src` is set. | No |
| `size` | `number` | `24` | Square render box in pixels; any number works. Default 24. The size variant values (16, 24, 40, 64) are the recommended presets, not the only allowed values. | No |
| `animated` | `boolean` | `false` | Pulse the three leading bars while true; a controlled signal driven from the consumer's hover/focus state (respects prefers-reduced-motion). Default false. | No |
| `background` | `boolean` | `false` | Render the brand lime circle background behind a contrast mark (`--logo-background` / `--logo-color`). Default false. | No |
| `title` | `string` | `Digitaltableteur` | Accessible name for the mark. Ignored when `decorative`. Default "Digitaltableteur". | No |
| `decorative` | `boolean` | `false` | When true the mark is purely decorative and removed from the accessibility tree. Default false. | No |
| `className` | `string` | none | Optional utility/spacing classes. | No |

## Variants

- Available sizes: `16`, `24`, `40`, `64` (default `24`).

## Invalid combinations

- SHOULD NOT: When `src` is set, then do not set `animated` or `background`. `animated` and `background` style the built-in mark only; with `src` set they are ignored.
- SHOULD NOT: When `decorative` is `true`, then do not set `title`. A decorative logo is removed from the accessibility tree, so `title` is never announced. Drop `title` or make the logo non-decorative.

## Keyboard

The contract records no keyboard interaction.

## Rules

Every item under When not to use is a MUST NOT. MUST and SHOULD follow RFC 2119.

| Level | Rule | How it is checked |
| --- | --- | --- |
| SHOULD NOT | When `src` is set, then do not set `animated` or `background`. `animated` and `background` style the built-in mark only; with `src` set they are ignored. | Checked by the MCP tool validate_component_usage (rule `logo-src-ignores-mark-options`). Also enforced in code: Logo.tsx src branch returns before background/animated are applied. |
| SHOULD NOT | When `decorative` is `true`, then do not set `title`. A decorative logo is removed from the accessibility tree, so `title` is never announced. Drop `title` or make the logo non-decorative. | Checked by the MCP tool validate_component_usage (rule `logo-decorative-ignores-title`). Also enforced in code: Logo.tsx: title is not rendered when decorative. |
| MUST | ARIA: Accessible name via title unless decorative. | Not yet verified: no evidence record. WCAG 4.1.2. |
| MUST | ARIA: Decorative renders aria-hidden. | Not yet verified: no evidence record. WCAG 4.1.2. |
| MUST | Required stories produce no axe violations at the configured severity. | Automated by `npm run test:stories:matrix:ci`. WCAG 2.5.8. |
| MUST | The accessibility tree (role, name, state) matches the committed snapshot for every required story. | Automated by `npm run test:stories:matrix:ci`. WCAG 1.3.1, 4.1.2. |
| MUST | The component remains legible and operable under a real browser forced-colors: active pass. | Automated by `npm run test:stories:hc`. |
| MUST | A human completed an end-to-end accessibility review of this component. | Manual review, last on 2026-11-04. |

## Install and import

- Install: `npm install @digitaltableteur/react` (version 0.9.1, restricted access on npm).
- Import: `import { Logo } from "@digitaltableteur/react";`
- Entry point: `@digitaltableteur/react/content` exports it too.
- Styles: import `@digitaltableteur/react/style.css` once at the app boundary.
- Also available as the custom element `<dt-logo>`; see the custom elements manifest.

## Links

- Machine-readable contract (Design System Contract 1.0): https://www.digitaltableteur.com/contracts/v1/Logo.contract.json
- Markdown version of this page: https://www.digitaltableteur.com/design-system/components/logo.md
- Component index as JSON: https://www.digitaltableteur.com/design-system/components.json
- All components: https://www.digitaltableteur.com/design-system/components
- Source: The implementation lives in a private repository. This page, its Markdown twin and the contract are generated from it at build time and are the public source of truth.