Measure Core Web Vitals (FCP, LCP, CLS, INP, TTFB) with Playwright. Master performance regression detection.
Screenshot comparison, responsive breakpoints, dynamic content snapshots, cross-browser visual diffs.
Simulate concurrent users, measure throughput, and identify bottlenecks with realistic load scenarios.
Practice finding XSS, CSRF, clickjacking, JWT issues, CORS misconfigurations, and insecure redirects.
Touch gestures, viewport emulation, orientation changes, soft keyboard handling, and mobile-only patterns.