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.

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MVC (Model-View-Controller)

An architectural pattern that separates an application into three components: data (Model), interface (View), and logic (Controller).

Server-Sent Events (SSE)

A web technology enabling servers to push real-time updates to browsers over a single HTTP connection, simpler than WebSockets.

A two-dimensional CSS layout system for creating complex grid-based designs with rows and columns.

A communication protocol that enables full-duplex, real-time data exchange between a browser and server over a single connection.

HTTP headers that control cross-origin resource sharing between different domains, specifying allowed origins, methods, and headers.

Cross-Origin Resource Sharing (CORS)

An HTTP mechanism that allows web pages to request resources from a different domain than the one serving the page.

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