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Web.dev by Google

Learn and apply the web's modern capabilities to your own sites and apps.

Performance Audits for metrics like first paint and time to interactive to determine lag. PWA Assesses your page against the baseline Progressive Web App Checklist. Best Practices Looks for everything from HTTPS usage to correct image aspect ratios. SEO Checks for best practices to ensure your site is discoverable. Accessibility Checks for common issues that may prevent users from accessing your content.