What is WCAG 2.1 and Why Does It Matter for Your Website?

What is WCAG?

The Web Content Accessibility Guidelines (WCAG) are published by the W3C and define how to make web content more accessible to people with disabilities. WCAG 2.1, released in 2018, is currently the most widely referenced version and forms the basis of legal requirements in the EU, UK, US, and many other jurisdictions.

The three levels

WCAG 2.1 has three conformance levels:

• Level A — the minimum. Failure at this level means some users cannot access your content at all.
• Level AA — the standard required by most regulations, including the EU Web Accessibility Directive and the European Accessibility Act. This is what most businesses should target.
• Level AAA — the highest level. Not required by most regulations, but ideal for content serving users with significant disabilities.

What does Level AA require?

AA compliance covers a wide range of criteria, including:

• Sufficient colour contrast (4.5:1 ratio for normal text)
• All functionality available via keyboard
• Images have descriptive alt text
• Forms have proper labels
• Pages have meaningful titles and language declarations
• Error messages are clear and helpful

Why it matters now

The European Accessibility Act (EAA) comes into force in June 2025 for businesses operating in the EU. Non-compliance can result in formal complaints, audits, and fines. Beyond legal risk, accessible websites simply work better for everyone — they're faster, more semantic, and easier to use on assistive technology.

How automated monitoring helps

No automated tool can catch every accessibility issue — some require human judgement. But automated scanning can reliably detect a significant portion of WCAG failures, especially in the A and AA categories: missing alt text, poor contrast ratios, missing labels, broken ARIA roles, and more.

Regular automated scanning gives you a continuous baseline. You'll catch regressions before they become complaints.