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Lighthouse - Website Analyzer
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Lighthouse

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description Lighthouse Overview

Lighthouse is an open-source, automated tool from Google that analyzes web pages for performance, accessibility, SEO, and progressive web app capabilities, providing scores and recommendations for improvement.

help Lighthouse FAQ

How do I run an audit with Google Lighthouse?

You can run Lighthouse directly within the Google Chrome browser by opening the Developer Tools and navigating to the "Lighthouse" tab. After choosing your desired categories, such as Performance or Accessibility, you simply click "Generate report" to analyze the active web page.

What metrics does Lighthouse use to calculate its Performance score?

Lighthouse uses several Core Web Vitals to calculate its Performance score, including Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS). It also factors in First Contentful Paint (FCP) and Speed Index to provide an overall score from 0 to 100.

Can Lighthouse test Progressive Web Apps (PWAs)?

Yes, Lighthouse has a dedicated "Progressive Web App" category that evaluates if an application meets the baseline requirements of a PWA. This audit checks for crucial elements like a web app manifest, service workers, and offline functionality.

Is Google Lighthouse free to use?

Lighthouse is completely free and open-source, maintained by Google. Developers can run it via Chrome DevTools, the command line as an npm package, or integrate it into continuous integration pipelines using Lighthouse CI.

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