Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The index read-only property of the ServiceWorkerRegistration interface returns a reference to the ContentIndex interface, which allows for indexing of offline content.
A ContentIndex object.
You can access the property from either your main script or the registered service worker.
Here is an example from the main script:
// reference registration
const registration = await navigator.serviceWorker.ready;
// feature detection
if ("index" in registration) {
// Content Index API functionality
const contentIndex = registration.index;
}From the service worker:
// service worker script
const contentIndex = self.registration.index;