Navigation Timing & Service Worker

Instructions:

1. Load any page on this origin once so the service worker can install.
2. Load test page /?respondFromSW=true to test condition:
   • Fetch event calls event.respondWith()
3. Load test page /?respondFromSW=false to test condition:
   • Fetch event DOES NOT call event.respondWith()
4. Open the console to see the Navigation Timing values logged:

Behavior:

• Service worker script should block for ~200ms during start up
• Service worker fetch event should block for ~500ms before calling event.respondWith()
• Promise passed to event.respondWith() should take ~1000ms to resolve