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Accessibility in Web Development: A Practical Introduction
Learn web accessibility (a11y) fundamentals: ARIA labels, keyboard navigation, color contrast, and WCAG guidelines.
Web accessibility (a11y) ensures websites are usable by everyone, including people with disabilities. It's both a legal requirement and a best practice.
WCAG Guidelines
The Web Content Accessibility Guidelines (WCAG) are organized around four principles (POUR):
- Perceivable: Information must be presentable in ways users can perceive (alt text, captions)
- Operable: Interface must be navigable via keyboard, with enough time to read
- Understandable: Content must be readable and predictable
- Robust: Content must work with assistive technologies
Quick Wins
- Add alt text to all images
- Ensure sufficient color contrast (4.5:1 for text)
- Make all functionality available via keyboard
- Use semantic HTML (nav, main, article, button)
- Add ARIA labels where semantic HTML isn't sufficient
Testing
Use automated tools (Lighthouse, axe) for basic checks. Test with keyboard-only navigation. Test with screen readers (VoiceOver, NVDA). Test with color blindness simulators.
Frequently Asked Questions
What is the minimum color contrast ratio?
WCAG AA requires 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+). WCAG AAA requires 7:1 for normal text.
Do I need ARIA on every element?
No. Use semantic HTML first (button, nav, main). ARIA supplements HTML semantics — the first rule of ARIA is don't use ARIA if you can use semantic HTML.
Is accessibility a legal requirement?
In many countries, yes. The EU Accessibility Act, ADA (US), and AODA (Canada) require digital accessibility. Non-compliance can result in lawsuits and fines.