WCAG
Definition
Web Content Accessibility Guidelines – the international standards that define how to make web content accessible to people with disabilities.
What is WCAG?
WCAG stands for Web Content Accessibility Guidelines, the internationally recognised standards for web accessibility. Developed by the W3C (World Wide Web Consortium), WCAG provides technical guidance for making websites usable by people with disabilities.
These guidelines form the basis for accessibility laws and regulations worldwide.
Why WCAG Matters
Legal Compliance
Many countries require websites to meet WCAG standards. In the UK, public sector sites must comply. Private businesses face increasing legal pressure.
Broader Audience
Approximately 20% of people have some form of disability. WCAG compliance ensures they can use your site.
Better User Experience
Accessibility improvements often benefit all users – clearer navigation, readable text, and logical structure help everyone.
SEO Benefits
Many WCAG requirements align with SEO best practices – proper headings, descriptive links, and alt text.
WCAG Conformance Levels
Level A (Minimum)
Basic requirements that must be met. Without these, some users cannot access content at all.
Level AA (Standard)
The commonly targeted level for most websites. Required for UK public sector sites.
Level AAA (Enhanced)
Highest level of accessibility. Difficult to achieve for all content types, typically targeted for specific sections.
WCAG Principles (POUR)
All guidelines fall under four principles:
Perceivable
Users must be able to perceive information. Includes text alternatives for images, captions for video, and sufficient colour contrast.
Operable
Users must be able to operate the interface. Includes keyboard accessibility, enough time to read content, and no seizure-triggering content.
Understandable
Content and navigation must be understandable. Includes readable text, predictable navigation, and helpful error messages.
Robust
Content must work with current and future technologies. Includes valid code and compatibility with assistive technologies.
Getting Started with WCAG
- Audit your current site against WCAG 2.1 AA
- Prioritise fixes by impact and effort
- Address critical issues first (forms, navigation, images)
- Build accessibility into future development
- Test regularly with real users and automated tools