Skip to main content

Web accessibility fundamentals (a11y)

Make your site usable by everyone: WCAG standards, practical best practices, and the right tools to test accessibility on the web.

Web accessibility lets everyone use your site. It is also a legal requirement. ## WCAG standards ### Conformance levels - **A**: Minimum required - **AA**: Recommended standard - **AAA**: Maximum accessibility ## Best practices ### Semantic HTML structure ```html ... ... ... ... ``` ### Images Always use a descriptive alt attribute. ### Forms Associate a label with every field. ### Contrast Minimum ratio of 4.5:1 for text. ### Keyboard navigation Everything must be reachable without a mouse. ## Testing tools - WAVE Extension - Lighthouse - axe DevTools - VoiceOver / NVDA ## Benefits - Better UX for everyone - Improved SEO - Legal compliance - Positive brand image Accessibility is not a constraint, it is an opportunity.