What is WCAG? Web Accessibility Guidelines Explained
A simple guide to WCAG (Web Content Accessibility Guidelines). Understand the 4 principles (POUR) and different compliance levels (A, AA, AAA).
WCAG (Web Content Accessibility Guidelines) is a series of documents giving recommendations for making Web content more accessible. It is developed by the World Wide Web Consortium (W3C), the main international standards organization for the Internet.
The Goal of WCAG 🎯
The goal is simple: ensure that no one is excluded from using your website due to a disability (visual, auditory, physical, speech, cognitive, language, learning, and neurological).
The 4 Principles (POUR) 🏗️
WCAG is organized around four principles. If your site violates any of these, it is not accessible.
- Perceivable: Users must be able to perceive the information (it can't be invisible to all their senses).
- Example: Images must have alt text for blind users. Videos must have captions for deaf users.
- Operable: User interface components must be operable.
- Example: The site must work with a keyboard alone (no mouse required).
- Understandable: Information and operation must be understandable.
- Example: Navigation should be consistent. Error messages should be clear.
- Robust: Content must be robust enough to work with current and future assistive technologies (like screen readers).
- Example: Using valid HTML and standard ARIA tags.
Why You Should Care Today ❤️
Beyond avoiding lawsuits, accessible sites are better for everyone. High contrast text is easier to read in the sun. Captions help people in noisy environments. Clean code improves SEO.
Is your site excluding visitors? Accessibility defects can be hard to spot manually. Use Sitecheck's accessibility scanner to automatically detect WCAG failures like low contrast, missing alt text, and ARIA errors.