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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Google's metrics for measuring user experience quality, including loading speed, interactivity, and visual stability of web pages.

The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.

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

A vocabulary for validating the structure and content of JSON data, ensuring API requests and responses conform to expected formats.

A typed superset of JavaScript that adds static type checking, interfaces, and advanced IDE support to JavaScript development.

Progressive Enhancement

A web design strategy that starts with basic functionality for all browsers and progressively adds advanced features for capable ones.

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