Web Accessibility: Building Interfaces Everyone Can Use

Web accessibility means designing and building web applications that can be used by everyone, including people with visual, auditory, motor, or cognitive disabilities. Approximately 15% of the world's population lives with some form of disability. Beyond ethics and legal requirements, accessible design improves usability for all users — curb cuts help wheelchair users, parents with strollers, and delivery workers equally.

Semantic HTML is the foundation of accessibility. Using the correct HTML elements — <nav> for navigation, <main> for primary content, <button> for interactive actions, <h1>-<h6> for headings in order — provides structure that assistive technologies (like screen readers) rely on to help users navigate. A page built entirely with <div> elements may look identical visually, but it's invisible to screen readers.

Keyboard navigation must work for all interactive functionality. Every button, link, form input, and interactive element must be reachable and operable using only a keyboard. The Tab key should move focus through elements in a logical order. Enter and Space should activate buttons. Escape should close modals and dropdowns. Custom interactive components (like date pickers or dropdown menus) need explicit keyboard event handling.

Color must not be the only way to convey information. Status indicators that use only red/green are invisible to people with color blindness (approximately 8% of men). Add text labels, icons, or patterns alongside color. Ensure sufficient contrast between text and background — WCAG AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.

Alternative text for images serves users who cannot see them. Every meaningful image needs a concise, descriptive alt attribute that conveys the image's purpose — not its appearance. A team photo's alt text should describe the context ('YR NOVATECH engineering team'), not the visual details ('group of people standing in front of a building'). Decorative images that don't convey information should have empty alt attributes (alt='').

Form accessibility requires visible labels associated with inputs (using the <label> element with htmlFor), clear error messages that identify which field has an error and what's wrong, and proper input types (type='email' triggers appropriate mobile keyboards). Screen reader users navigate forms by listening to labels, so a form that relies on placeholder text instead of labels is unusable for them.