Google Lighthouse is an open-source web quality measurement tool developed by Google, built into Chrome DevTools, that comprehensively analyzes website performance, accessibility, SEO, and best practices compliance.

Measurement Tool & Environment
• Latest Lighthouse version (Chrome browser engine based)
• Real browser environment simulation with Headless Chrome
• Mobile 3G/4G network and mid-tier device performance baseline
• Core Web Vitals measurement reflecting real user experience

Testing Objectives
• Assess overall website quality level
• Identify performance bottlenecks affecting user experience
• Verify Search Engine Optimization (SEO) compliance
• Check Web Content Accessibility Guidelines (WCAG) adherence
• Evaluate web standards and security best practices implementation

4 Core Assessment Areas
1. Performance: Page loading speed, Core Web Vitals, resource optimization
2. Accessibility: ARIA labels, color contrast, keyboard navigation support
3. Best Practices: HTTPS usage, console errors, image aspect ratios
4. SEO: Meta tags, structured data, mobile-friendliness

Testing takes approximately 30 seconds to 2 minutes, varying based on network conditions and website complexity.