Web Development Beginner

What is Web Accessibility (a11y)?

The practice of designing websites that can be used by people with disabilities, following WCAG guidelines.

Web accessibility ensures websites are usable by everyone, including people with visual, auditory, motor, and cognitive disabilities. WCAG (Web Content Accessibility Guidelines) defines standards at levels A, AA (common target), and AAA.

Key practices include semantic HTML, alt text for images, keyboard navigation, sufficient color contrast, ARIA attributes, screen reader compatibility, and captions for media. Accessibility also benefits SEO and general usability.

Related Terms

A set of browser-native APIs for creating reusable, encapsulated custom HTML elements with their own styling and behavior.

Progressive Web App (PWA)

A web application that uses modern web capabilities to deliver app-like experiences with offline support and push notifications.

The second major version of HTTP that improves performance through multiplexing, header compression, and server push.

JavaScript Object Notation — a lightweight data interchange format that is easy for humans to read and machines to parse.

REST (Representational State Transfer)

An architectural style for designing networked applications using standard HTTP methods and stateless communication.

HTTP Status Codes

Standardized three-digit codes returned by web servers to indicate the result of a client's HTTP request.

View All Web Development Terms →