Create a PerformanceObserver for largest contentful paint (LCP)
Observes Largest Contentful Paint using the Performance API. Note: LCP can fire multiple times as larger elements are rendered.
Function to call when LCP is detected
Cleanup function to disconnect observer
const cleanup = observeLCP((entry) => { console.log('LCP:', entry.value, 'ms'); console.log('Rating:', entry.rating);});// Later, to stop observing:cleanup(); Copy
const cleanup = observeLCP((entry) => { console.log('LCP:', entry.value, 'ms'); console.log('Rating:', entry.rating);});// Later, to stop observing:cleanup();
Create a PerformanceObserver for largest contentful paint (LCP)
Observes Largest Contentful Paint using the Performance API. Note: LCP can fire multiple times as larger elements are rendered.