@holmdigital/engine
!TypeScript
> Regulatory accessibility test engine with Virtual DOM, Shadow DOM support, and built-in legal compliance reporting.
Why this package?
Most accessibility tools give you technical errors (e.g., "Color contrast must be 4.5:1"). This engine bridges the gap between technical code validation (using axe-core) and legal compliance (EN 301 549, Section 508, DOS-lagen).
It handles the heavy lifting of:
1. Mapping technical failures to specific legal clauses.
2. Validating HTML structure to ensure test accuracy.
3. Reporting in multiple languages (EN, SV, NL, DE, FR, ES) for non-technical stakeholders.
4. CI/CD Pipeline Integration with automatic enforcement.
For a comprehensive guide on CLI flags, CI/CD integration, and configuration files, see the Engine Library Catalog.
Features
- Regulatory Mapping: Maps technical failures to EU laws (EN 301 549, EAA).
- HTML Structure Validation: Built-in html-validate checks to prevent false positives/negatives.
- Internationalization (i18n): Comprehensive support for 9 languages: English (en), Swedish (sv), Norwegian (no), Finnish (fi), Danish (da), German (de), French (fr), Spanish (es), and Dutch (nl).
- Template-Driven Accessibility Statements: Generates modern, glassmorphism-styled statements using externalized JSON templates for each language, allowing for professional legal phrasing and deep customization.
- Multi-Company Metadata: Easily customize statements via CLI flags or .a11yrc for scalable client generation.
- Enriched JUnit XML: Professional CI/CD reports including scan duration, page title, engine metadata, and detailed failing node snippets (Target + HTML).
- Configurable Severity Threshold: Fail CI only on critical/high issues (configurable).
- Pseudo-Automation: Automatically generates Playwright/Puppeteer test scripts for manual verification steps.
- PDF Reporting: Generates beautiful, compliant PDF reports with severity-sorted violations, HTML error counts, and @HolmDigital/engine branding.
- TypeScript: Written in TypeScript with full type definitions included.
Installation
``bash
npm install @holmdigital/engine
`
CLI Usage
`bash
npx hd-a11y-scan [options]
`
Options:
| Option | Description |
|--------|-------------|
| --lang | Language code (en, sv, de, fr, es, nl, no, fi, da, en-gb, en-us, en-ca) |
| --threshold | Severity threshold for compliance (critical, high, medium, low). Default: high |
| --ci | Run in CI mode (exit code 1 on failure) |
| --json | Output results as JSON |
| --pdf | Generate a PDF report |
| --statement | Generate a Premium V2 accessibility statement (HTML) |
| --org | Organization name for the statement metadata |
| --email | Contact email for the statement metadata |
| --phone | Contact phone for the statement metadata |
| --response-time | Response time for the statement metadata |
| --publish-date | Publish date for the website (YYYY-MM-DD) |
| --viewport | Set viewport size (mobile, tablet, desktop, or custom 1024x768) |
| --generate-tests | Generate Pseudo-Automation tests |
| --invalid-https-cert | Allow scanning sites with invalid/self-signed HTTPS certificates ⚠️ |
| --api-key | API Key for HolmDigital Cloud |
| --cloud-url | Custom Cloud API Endpoint (default: cloud.holmdigital.se) |
$3
If your site achieves a
100% score, the CLI will generate a
Shields.io badge that you can add to your project's README:
!Accessibility Status: 100% Compliant
The badge uses accessible colors (AAA compliant contrast) and is included in both the CLI output and the HTML report.
> ⚠️ Security Note: The --invalid-https-cert flag should only be used in trusted environments (local dev, staging). It disables certificate validation and is not recommended for production. (Contributed by @FerdiStro)
Example:
`bash
Fail only on critical issues in CI
npx hd-a11y-scan https://example.com --ci --threshold critical
Full JSON output with metadata
npx hd-a11y-scan https://example.com --json
`
JSON Output
`
json
{
"url": "https://example.com",
"timestamp": "2026-01-13T17:05:11.749Z",
"metadata": {
"engineVersion": "1.4.12",
"axeCoreVersion": "4.10.2",
"standardsVersion": "1.2.3",
"scanDuration": 2891,
"pageTitle": "Example Domain",
"pageLanguage": "en"
},
"stats": {
"passed": 13,
"critical": 0,
"high": 0,
"medium": 2,
"low": 0,
"total": 2
},
"legalSummary": {
"wadApplicable": 2,
"eaaApplicable": 2,
"eaaDeadlineViolations": 2
},
"score": 90,
"complianceStatus": "PASS"
}
`
EU Legal Framework
The engine maps violations to EU legal frameworks:
| Framework | Description | Deadline |
|-----------|-------------|----------|
| WAD | Web Accessibility Directive 2016/2102 (Public Sector) | Already in force |
| EAA | European Accessibility Act 2019/882 (Private Sector) | June 28, 2025 |
$3
| Field | Description |
|-------|-------------|
|
wadApplicable
| Violations that affect WAD compliance (public sector) |
| eaaApplicable
| Violations that affect EAA compliance (private sector) |
| eaaDeadlineViolations
| Issues that must be fixed before EAA 2025 deadline |$3
The HTML/PDF report now includes:
- EU Legal Framework Impact summary section
- WAD/EAA badges on each violation card
- EAA deadline warnings for issues requiring immediate attention
Severity Threshold
The
--threshold
flag controls when complianceStatus
becomes FAIL
:| Threshold | Fails on |
|-----------|----------|
|
critical
| Only critical violations |
| high
(default) | Critical + high violations |
| medium
| Critical + high + medium violations |
| low
| Any violation |Why this matters for CI/CD:
`
bash
Strict: Block deployment on any serious issue
npx hd-a11y-scan https://staging.example.com --ci --threshold highLenient: Only block on critical issues (like missing alt text)
npx hd-a11y-scan https://staging.example.com --ci --threshold critical
`
Medium violations (like missing
landmark) won't fail your CI by default, but are still reported for awareness.Metadata Fields
| Field | Description |
|-------|-------------|
|
engineVersion | Version of @holmdigital/engine |
| axeCoreVersion | Version of axe-core used |
| standardsVersion | Version of @holmdigital/standards database |
| scanDuration | Scan time in milliseconds |
| pageTitle | HTML <code class="bg-muted px-1 py-0.5 rounded text-sm font-mono"> of scanned page |<br />| </code>pageLanguage<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono"> | </code>lang<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono"> attribute of </code><html><code class="bg-muted px-1 py-0.5 rounded text-sm font-mono"> |<br />| </code>stats.passed<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono"> | Number of accessibility checks that passed |</p><p class="my-3"><br /><h2 class="text-xl font-semibold mt-5 mb-3">Programmatic Usage</h2></p><p class="my-3"></code>`<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono">typescript<br />import { RegulatoryScanner, setLanguage } from '@holmdigital/engine';</p><p class="my-3">const scanner = new RegulatoryScanner({<br /> url: 'https://example.com',<br /> severityThreshold: 'high' // critical, high, medium, low<br />});</p><p class="my-3">setLanguage('sv');</p><p class="my-3">const result = await scanner.scan();</p><p class="my-3">console.log(</code>Score: ${result.score}<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono">);<br />console.log(</code>Duration: ${result.metadata.scanDuration}ms<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono">);<br />console.log(</code>Passed: ${result.stats.passed}, Failed: ${result.stats.total}<code class="bg-muted px-1 py-0.5 rounded text-sm font-mono">);<br /></code>``</p><p class="my-3"><h2 class="text-xl font-semibold mt-5 mb-3">License</h2></p><p class="my-3">MIT © Holm Digital AB<br /></p></div><div class="flex justify-center absolute inset-x-0 bottom-0 bg-gradient-to-t from-background via-background to-transparent pb-4 pt-16"><button data-slot="button" class="inline-flex items-center justify-center whitespace-nowrap text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50 h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-down mr-1 h-4 w-4"><path d="m6 9 6 6 6-6"></path></svg>Show more</button></div></div></div><template id="P:3"></template><template id="P:4"></template></div></div></div><script>self.__next_f.push([1,"2c:[\"$\",\"path\",\"mthhwq\",{\"d\":\"m9 18 6-6-6-6\"}]\n2d:[\"$\",\"span\",null,{\"className\":\"ml-2 shrink-0 font-mono text-xs 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