Introduction to Web Accessibility

Web accessibility ensures that people with disabilities can perceive, understand, navigate, and interact with websites and tools. It's not just about compliance - it's about creating inclusive experiences for everyone.

Understanding WCAG Guidelines

1. Perceivable

• Provide text alternatives for non-text content
• Provide captions and alternatives for multimedia
• Present content in different ways
• Make it easier for users to see and hear content

2. Operable

• Make all functionality available from keyboard
• Give users enough time to read and use content
• Do not use content that causes seizures
• Help users navigate and find content

3. Understandable

• Make text content readable and understandable
• Make content appear and operate in predictable ways
• Help users avoid and correct mistakes

4. Robust

• Maximize compatibility with current and future tools

Implementing Accessibility Features

Semantic HTML

ARIA Labels and Roles

Focus Management

Color and Contrast

Testing Accessibility

Automated Testing

Manual Testing Checklist

1. Keyboard Navigation

• Tab order is logical
• Focus indicators are visible
• No keyboard traps

2. Screen Reader Testing

• Content is announced correctly
• Images have appropriate alt text
• Form controls are properly labeled

3. Zoom and Magnification

• Content remains readable at 200% zoom
• No horizontal scrolling at 400% zoom
• Layout maintains functionality

Common Patterns and Solutions

Accessible Modal Dialog

Skip Links

Tools and Resources

Development Tools

• WAVE Web Accessibility Evaluation Tool
• axe DevTools
• Chrome Lighthouse
• NVDA Screen Reader
• Color Contrast Analyzers

Testing Tools

• jest-axe for automated testing
• Cypress-axe for end-to-end testing
• Pa11y for CI/CD integration

Best Practices

1. Start with Semantic HTML

• Use appropriate elements
• Maintain logical structure
• Implement proper heading hierarchy

2. Enhance with ARIA When Needed

• Follow ARIA design patterns
• Test with screen readers
• Keep it simple

3. Focus Management

• Implement keyboard navigation
• Trap focus when needed
• Provide skip links

4. Visual Considerations

• Ensure sufficient color contrast
• Support text resizing
• Consider reduced motion

5. Content Guidelines

• Write clear instructions
• Use simple language
• Provide error prevention