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Accessibility, privacy & licensing

This page documents the accessibility features, privacy compliance, and technical standards implemented on this website.

GDPR/AVG compliance

This website is fully compliant with the General Data Protection Regulation (GDPR) and the Dutch Algemene Verordening Gegevensbescherming (AVG).

Data collection

Aspect Status
Cookies No cookies used
Analytics No tracking or analytics
Personal data No personal data collected
Contact forms None present
Third-party services None embedded
User accounts Not applicable

Privacy by design

  • Static site: This is a static GitHub Pages site with no server-side processing
  • No databases: No user data is stored in any database
  • No sessions: No session tracking or user identification
  • External links: Links to external sites (KB, Internet Archive) open in context with rel="noopener" for security

WCAG 2.1 accessibility

This website strives to meet WCAG 2.1 Level AA compliance, the European standard for web accessibility.

Implemented features

Perceivable (Principle 1)

Guideline Implementation
1.1 Text alternatives All images have descriptive alt attributes
1.3 Adaptable Semantic HTML5 structure (header, nav, main, footer)
1.4 Distinguishable Minimum 4.5:1 color contrast ratio for text

Operable (Principle 2)

Guideline Implementation
2.1 Keyboard accessible All interactive elements keyboard-navigable
2.4 Navigable Skip-to-content link, breadcrumb navigation
2.4.7 Focus visible Clear focus indicators (3px blue outline)

Understandable (Principle 3)

Guideline Implementation
3.1 Readable Language declared (lang="nl")
3.2 Predictable Consistent navigation and layout

Robust (Principle 4)

Guideline Implementation
4.1 Compatible Valid HTML5, ARIA landmarks and labels

Accessibility features

  • Skip to main content link for screen reader users
  • Keyboard navigation throughout the site
  • Focus trapping in modal dialogs (lightbox)
  • ARIA labels on all interactive elements
  • Reduced motion support via prefers-reduced-motion
  • High contrast mode support via prefers-contrast
  • Screen reader announcements (aria-live regions)

Responsive design

The site is fully responsive across all device types and orientations.

Breakpoints

Device Width Optimizations
Desktop > 768px Full layout, 3-column grid
Tablet 601-768px Adapted spacing, 2-column grid
Mobile 401-600px Single column, larger touch targets
Small mobile ≤ 400px Compact layout, optimized typography

Orientation support

  • Portrait mode: Optimized single-column layout
  • Landscape mode: Adjusted lightbox sizing, compact captions

Touch interactions

  • Swipe navigation in image lightbox (left/right)
  • Touch-friendly button sizes (minimum 44px)
  • Smooth scrolling with scroll-behavior: smooth

SEO optimization

Meta tags

Tag Purpose
<title> Page-specific titles
meta description Page descriptions
meta keywords Relevant keywords
link canonical Canonical URLs
meta robots Index, follow directive

Open graph

Full Open Graph support for social media sharing:

  • og:title, og:description, og:url
  • og:type, og:site_name, og:locale

Twitter cards

Twitter Card meta tags for Twitter sharing.

Schema.org structured data

JSON-LD structured data including:

  • Website schema with publisher information
  • Breadcrumb list schema for navigation
  • Organization schema for KB

Security

Implemented measures

Measure Implementation
HTTPS Enforced via GitHub Pages
External links rel="noopener" on all external links
No inline scripts JavaScript in document body only
No external scripts No third-party JavaScript
Content security Static content only, no user input

GitHub Pages security

GitHub Pages provides:

  • Automatic HTTPS with valid SSL certificates
  • DDoS protection
  • Regular security updates
  • No server-side vulnerabilities (static hosting)

Browser support

Browser Version Status
Chrome 90+ Full support
Firefox 88+ Full support
Safari 14+ Full support
Edge 90+ Full support
Mobile Safari iOS 14+ Full support
Chrome Mobile Android 10+ Full support

Progressive enhancement

  • Core content accessible without JavaScript
  • Enhanced features (lightbox) require JavaScript
  • CSS Grid with fallback for older browsers

Dark mode

The site respects the user’s system preference for dark mode:

  • Automatic detection via prefers-color-scheme: dark
  • Adjusted colors for readability
  • Maintained contrast ratios

Optimized print stylesheet including:

  • Visible URLs after links
  • Removed lightbox and interactive elements
  • Preserved KB logo colors
  • Prevented page breaks within cards

Validation & testing

Tools used

Tool Purpose
W3C HTML validator HTML5 validation
WAVE Accessibility testing
Lighthouse Performance, accessibility, SEO audit
axe DevTools Automated accessibility testing
Color contrast analyzer WCAG contrast verification

Testing checklist

  • HTML5 validation passes
  • No WCAG 2.1 AA violations
  • Keyboard navigation complete
  • Screen reader compatible
  • Mobile responsive (320px - 1920px)
  • Touch interactions working
  • Dark mode rendering correct
  • Print preview acceptable

Known limitations

Due to GitHub Pages static hosting:

  1. No custom HTTP headers: Cannot set CSP, HSTS, or other security headers directly
  2. No server-side redirects: Must rely on client-side or Jekyll redirects
  3. No dynamic content: All content is pre-generated

These are acceptable trade-offs for a documentation and archive reference site.

Compliance standards summary

Standard Level Status
GDPR/AVG Full Compliant
WCAG 2.1 AA Compliant
EU Web Accessibility Directive - Compliant
HTML5 - Valid
Schema.org - Implemented

Image credits & copyrights

This section clarifies the different licensing that applies to different types of content on this site.

What is CC0 (public domain)

The following content is dedicated to the public domain under CC0 1.0 Universal:

  • All source code (Python scripts, HTML, CSS, JavaScript)
  • All text content (documentation, README files, this compliance page)
  • Data files (CSV, TXT files with URLs and metadata)

What is NOT public domain

Wayback Machine screenshots

The screenshots displayed in the gallery sections are captures of archived websites. These websites may contain copyrighted content owned by third parties. The screenshots are displayed here for:

  • Documentary purposes - Demonstrating the archiving work performed
  • Cultural heritage preservation - Showcasing Dutch digital heritage
  • Educational purposes - Illustrating web archiving practices

Copyright notice: If any rights holder believes their copyright is infringed by the display of these screenshots, please file a GitHub Issue and the KB will remove the images as soon as possible.

The KB (Koninklijke Bibliotheek) logo is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).

Social media brand icons

The social media icons (Bluesky, Mastodon, LinkedIn, YouTube, Instagram, Facebook, GitHub) represent registered trademarks of their respective companies. They are used here solely to link to the KB’s official social media presence.

Summary

Content type License
Source code CC0 1.0 (Public Domain)
Text & documentation CC0 1.0 (Public Domain)
Data files CC0 1.0 (Public Domain)
Wayback Machine screenshots Third-party copyrights might apply
KB logo CC BY-SA 3.0
Social media brand icons Trademarks of respective companies

Contact

For accessibility issues, compliance questions, or copyright concerns, please contact:

Last updated: April 2026