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

SEO (Search Engine Optimization)

The practice of optimizing websites to rank higher in search engine results, increasing organic traffic.

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

CDN (Content Delivery Network)

A distributed network of servers that delivers web content to users from the geographically closest location.

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

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.

Responsive Design

A web design approach that makes web pages render well on all screen sizes using flexible layouts and media queries.

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