The Complete Guide to Website Accessibility (WCAG 2.2) in 2025
1 in 7 people worldwide has a disability that affects how they use the web. Accessible websites serve more users, rank better on Google, and face lower legal risk.
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What is Web Accessibility and Who Does It Affect?
Web accessibility means designing and building websites that people with disabilities can use effectively. This includes people who are blind or have low vision (who use screen readers), people who are deaf or hard of hearing, people with motor disabilities (who use keyboards or switch devices instead of mice), and people with cognitive disabilities. The World Health Organization estimates that 15% of the global population — over 1 billion people — lives with some form of disability. In India, the 2011 census counted 26.8 million people with disabilities, a figure believed to significantly undercount the actual number.
WCAG 2.2: The International Standard
The Web Content Accessibility Guidelines (WCAG) 2.2, published by the W3C, is the international standard for web accessibility. It organises requirements around four principles: Perceivable (information must be presented so users can perceive it), Operable (interface components must be operable by all users), Understandable (information and operation must be understandable), and Robust (content must be interpreted reliably by assistive technologies). Compliance levels are A (minimum), AA (standard requirement), and AAA (highest). Most legal requirements worldwide target WCAG 2.2 Level AA.
The Most Common Accessibility Failures (and How to Fix Them)
The WebAIM Million study found that 96% of homepage failures involve one of six issues. Missing alt text on images: add descriptive alt attributes to every informational image. Empty links: every link must have descriptive text explaining where it goes. Low colour contrast: text must have a contrast ratio of at least 4.5:1 against its background — test with the WebAIM Contrast Checker. Missing form labels: every input must have an associated label element. Missing document language: the HTML element must have a lang attribute. These six fixes resolve the vast majority of accessibility failures on most websites.
Keyboard Navigation: Often Broken, Easily Fixed
Every function on your website must be operable using only a keyboard — no mouse required. Test this by pressing Tab through your page and checking that focus indicators are visible, that interactive elements receive focus in a logical order, that dropdown menus and modals can be opened and closed with keyboard, and that forms can be completed and submitted. Focus indicators (the outline on focused elements) are critical — many developers remove them with 'outline: none' because they look unsightly. Replace the default outline with a custom focus style instead of removing it entirely.
Automated Auditing Tools
Start with automated tools to find the easy wins. Google Lighthouse (built into Chrome DevTools under the 'Accessibility' tab) gives a score and lists specific failures. The axe DevTools browser extension (free tier) is the most comprehensive automated checker and integrates with browser developer tools. WAVE (wave.webaim.org) provides a visual overlay showing issues directly on your page. Important caveat: automated tools catch only 30–40% of accessibility issues — the rest require manual testing. After automated fixes, test with a screen reader (VoiceOver on Mac/iOS is free, NVDA is free on Windows).
Accessibility as an SEO Advantage
Many accessibility improvements directly benefit SEO. Alt text on images gives search engines context they cannot get from pixels. Proper heading structure (H1, H2, H3 hierarchy) helps both screen reader users and search engine crawlers understand page structure. Descriptive link text ('Read our web hosting guide' beats 'click here') gives search engines context about linked pages. Fast load times benefit both users with slow connections and Core Web Vitals scores. Semantic HTML helps crawlers parse content correctly. In practice, an accessibility audit almost always surfaces SEO improvements simultaneously.
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