Web Development Intermediate

What is Web Vitals?

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

Core Web Vitals include: LCP (Largest Contentful Paint — loading, should be under 2.5s), INP (Interaction to Next Paint — interactivity, should be under 200ms), and CLS (Cumulative Layout Shift — visual stability, should be under 0.1).

Web Vitals are a Google ranking factor. Improve LCP with image optimization, CDNs, and preloading. Improve INP by reducing JavaScript execution time and breaking long tasks. Improve CLS by setting explicit dimensions on images/ads and avoiding dynamic content insertion above the fold.

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Related Terms

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

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

A property where performing an operation multiple times produces the same result as performing it once.

Server-Sent Events (SSE)

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

API (Application Programming Interface)

A set of rules and protocols that allows different software applications to communicate and exchange data.

DOM (Document Object Model)

A programming interface for HTML documents that represents the page structure as a tree of objects that can be manipulated with JavaScript.

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