Building Accessible Websites: A Developer's Guide

Why Accessibility Matters

Web accessibility ensures that people with disabilities can use your website. This includes users with visual, auditory, motor, and cognitive impairments. Beyond being the right thing to do, accessibility improves SEO, user experience, and expands your potential audience.

Legal Requirements

In the UK, the Equality Act 2010 requires businesses to make reasonable adjustments for disabled users. Public sector organisations must meet WCAG 2.1 AA standards. Even for private businesses, accessibility is increasingly expected and can protect against discrimination claims.

Core Principles of WCAG

The Web Content Accessibility Guidelines (WCAG) provide four core principles:

• Perceivable: Information must be presentable in ways users can perceive (text alternatives for images, captions for videos)
• Operable: Interface components must be operable (keyboard navigation, sufficient time to respond)
• Understandable: Information and interface operation must be understandable (clear language, consistent navigation)
• Robust: Content must be robust enough to be interpreted by assistive technologies (valid HTML, ARIA attributes)

Practical Implementation

Here are key techniques for building accessible websites:

• Semantic HTML: Use proper HTML elements (headings, lists, buttons) for screen readers
• Alt text: Provide descriptive text for all images
• Colour contrast: Ensure text has sufficient contrast against backgrounds (4.5:1 for normal text)
• Keyboard navigation: Make all interactive elements accessible via keyboard
• Form labels: Associate labels with form inputs for screen readers
• Focus indicators: Show clear visual focus states for keyboard users
• ARIA attributes: Use ARIA roles and properties where semantic HTML is not enough

Testing for Accessibility

Regular testing ensures your site remains accessible:

• Automated tools: Use tools like axe DevTools, Lighthouse, or WAVE for initial checks
• Keyboard testing: Navigate your site using only a keyboard
• Screen reader testing: Test with NVDA (Windows) or VoiceOver (Mac)
• User testing: Include users with disabilities in your testing process

Business Benefits

Accessibility provides tangible business benefits:

• Larger potential audience (15% of the world has some form of disability)
• Improved SEO (search engines favour accessible sites)
• Better user experience for everyone
• Reduced legal risk
• Enhanced brand reputation

Getting Started

Start by auditing your current site against WCAG guidelines. Focus on high-impact fixes first: alt text, colour contrast, and keyboard navigation. Accessibility is an ongoing process, not a one-time task.

If you need help making your website accessible, get in touch to discuss an accessibility audit and implementation plan.