Measuring Core Web Vitals in SPAs: The 2026 Soft Navigations API Guide
SPAs break LCP, INP, and CLS measurement — only the landing page gets real data. Chrome 147's Soft Navigations API finally fixes per-route Core Web Vitals tracking. A practical 2026 guide with code for PerformanceObserver, the web-vitals soft-navs build, and a production-safe hybrid strategy.