Web Accessibility: Building Inclusive Applications

Accessibility ensures everyone can use your application, including people with disabilities. This guide covers WCAG guidelines, ARIA patterns, and practical implementation techniques.

WCAG Principles (POUR)#

1. Perceivable#

Content must be presentable in ways users can perceive:

2. Operable#

Interface must be operable by all users:

3. Understandable#

Content and operation must be understandable:

4. Robust#

Content must be robust for various technologies:

Semantic HTML#

Document Structure#

Heading Hierarchy#

ARIA Patterns#

Live Regions#

Modal Dialogs#

Tabs#

Forms#

Accessible Form Pattern#

Error Handling#

Focus Management#

Visible Focus Styles#

Managing Focus in SPAs#

Testing Accessibility#

Automated Testing#

Manual Testing Checklist#

1. Navigate using keyboard only (Tab, Enter, Space, Arrows)
2. Test with screen reader (VoiceOver, NVDA, JAWS)
3. Zoom to 200% - ensure content remains usable
4. Use high contrast mode
5. Disable images - check alt text adequacy
6. Check color contrast ratios (4.5:1 for text)

Conclusion#

Accessibility benefits everyone. Start with semantic HTML, add ARIA only when needed, and test with real assistive technologies. Build accessibility into your development process from the beginning.