# @accesslint/core

A pure accessibility rule engine — WCAG audit with zero browser dependencies.

## What it does

`@accesslint/core` scans a DOM tree for WCAG 2.1 Level A and AA violations. It runs in any JavaScript environment that provides a `Document` object: browsers, headless browsers, or server-side DOMs like happy-dom.

## Key features

- **Fast** — median audit completes in 52ms across 5,000 real-world sites
- **Comprehensive** — 93 rules covering images, forms, ARIA, landmarks, color contrast, and more
- **Zero dependencies** — ships as a single ES module with no runtime deps
- **Standards-based** — maps every rule to WCAG 2.1 success criteria
- **AI-ready** — each rule includes guidance and prompts for AI-powered remediation

## How it compares

Benchmarked against 5,000 sites from the Chrome UX Report, `@accesslint/core` is significantly faster than axe-core while maintaining high agreement on detections. See the [benchmarks](/content/core/benches/index.html) for details.

## Quick start

```
npm install @accesslint/core
```

```
import { runAudit } from "@accesslint/core";

const result = runAudit(document);
console.log(result.violations);
```

See the [Getting Started](/content/core/docs/getting-started/index.html) guide for a complete walkthrough.