Accessibility (A11y) ensures that people with visual, hearing, motor or cognitive disabilities can use the web with the same effectiveness as users without limitations. In 2025, the WCAG2.2 guidelines are the reference standard, and search engines prioritize accessible websites.
Why invest in A11y?
- Inclusion, expands the reach of your product to millions of users.
- SEO, semantic attributes and alternative texts improve indexing.
- Legal, many jurisdictions require compliance (e.g. LGPD, ADA).
- Usability, good practices benefit everyone, not just those with disabilities.
Main pillars of WCAG2.2
| Pillar | Description | Quick example |
|---|---|---|
| Noticeable | Information must be presentable so that everyone can understand it. | alt in images, subtitles in videos. |
| Operable | Interface must be navigable via keyboard and wizards. | tabindex="0" in custom elements. |
| Understandable | Content and UI must be clear and predictable. | Detailed error messages. |
| Robust | Compatible with current and future assistive technologies. | Correct use of semantic HTML5 elements. |
Quick implementation checklist
- Alternative text, all
<img>images havealtdescription. - Roles and ARIA, use
role="button"andaria-*attributes when necessary. - Contrast, minimum ratio of 4.5:1 (text) and 3:1 (graphics).
- Font size, allow resizing up to 200% without loss of content.
- Keyboard navigation, all controls are focusable (
tabindex). - Visible focus, clear highlight when focusing (
outlineorbox-shadow). - Subtitles, videos have
.vttor.srtembedded. - Accessible forms,
<label for="id">associated with<input id="id">. - Error messages, announced via
aria-live="assertive". - Test with tools, axe, Lighthouse, WAVE.
Custom buttons and screen readers
A sensitive point of accessibility are the customized buttons, those built on icons, without visible text. A "close" button represented only by an "X" does not say anything to anyone using a screen reader. The solution is to provide the control with an accessible label (for example, via aria-label), describing the action in words, and mark the decorative icon as invisible to assistive technologies. The general principle: every interactive control needs to communicate its function through text, even if that text doesn't appear on the screen.
Testing accessibility
- Lighthouse, open DevTools → Audits → Accessibility.
- axe-core, Chrome extension that highlights violations in real time.
- NVDA / VoiceOver, navigate the website using screen readers.
- Keyboard-only, disable the mouse and use
Tab,Enter,Space.
Advanced best practices
- Skip-link, invisible link at the top that jumps to the main content.
- Landmarks,
<header>,<nav>,<main>,<footer>help the structure. - ARIA-Live Regions, dynamic updates (e.g. toast) announced automatically.
- Focus Management, when opening modals, move focus to the first internal element and return to the trigger when closing.
- Color test, use color blindness simulators to validate contrast.
Useful tools
| Tool | Usage |
|---|---|
| axe DevTools | Detects WCAG violations in real time. |
| Lighthouse | Performance audits, SEO and A11y. |
| WAVE | Visual report of accessibility issues. |
| Color Contrast Analyzer | Check contrast ratios. |
| Screen Readers | NVDA (Windows), VoiceOver (macOS), TalkBack (Android). |
Conclusion
Implementing accessibility is not optional; it is essential for creating inclusive digital experiences, improving SEO and complying with legal requirements. By following the checklist above, adopting good semantic markup practices and testing with automatic and manual tools, your website will be ready to serve all users.
Have you already implemented any A11y solution? Share your experiences in the comments!
Also read
- Digital Accessibility UX - Complete Guide to Scaling
- Digital Accessibility UX - Complete Guide for Startups
- Digital Accessibility UX - Complete Guide for Small Teams
- Progressive Web Apps: Complete Guide to Native Web Experiences
- Accessibility in Mobile Applications - Complete Guide with Examples
- Inclusive Design