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

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.

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

HTTP Status Codes

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

API Rate Limiting

A strategy for limiting the number of API requests a client can make within a specified time window to protect server resources.

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

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