What is web accessibility and when should you use ARIA?

Web accessibility (a11y) ensures people with disabilities can use your site. **Start with native HTML first:** buttons, links, form labels, headings, and landmark elements. **Use ARIA when native semantics are not enough**, for example: - Custom components (tabs, combobox, modal) - Dynamic state announcements (`aria-live`) **Rules of thumb:** - Don’t add ARIA to elements that already have correct semantics. - Ensure keyboard support (Tab, Enter/Space, Esc). **Interview tip:** mention testing with keyboard-only navigation and a screen reader.