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 CSS layout model that provides efficient arrangement of items within a container, handling alignment, distribution, and spacing.

SPA (Single Page Application)

A web application that loads a single HTML page and dynamically updates content without full page reloads.

WebAssembly (Wasm)

A binary instruction format that enables near-native performance execution of code in web browsers alongside JavaScript.

Storing copies of frequently accessed data in faster storage to reduce load times and server processing.

Software that sits between the request and response in a web application, performing processing like authentication or logging.

HTTP Status Codes

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

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