{"json_modified": "2016-08-24T04:06:56.068058", "uuid": "bcdb93c9-c379-428f-bf95-0e426c106ed9", "title": "ServiceWorkerContainer.controller", "url": "/en-US/docs/Web/API/ServiceWorkerContainer/controller", "tags": ["API", "ServiceWorker", "Reference", "Property", "Controller", "ServiceWorkerController", "Service Workers"], "translations": [], "modified": "2016-08-24T04:06:56", "label": "ServiceWorkerContainer.controller", "localization_tags": [], "locale": "en-US", "id": 135037, "last_edit": "2016-08-24T04:06:50", "summary": "The <strong><code>controller</code></strong> read-only property of the <a href=\"/en-US/docs/Web/API/ServiceWorkerContainer\" title=\"The ServiceWorkerContainer interface of the ServiceWorker API provides an object representing the service worker as an overall unit in the network ecosystem, including facilities to register, unregister and update service workers, and access the state of service workers and their registrations.\"><code>ServiceWorkerContainer</code></a> interface returns a <a href=\"/en-US/docs/Web/API/ServiceWorker\" title=\"The ServiceWorker interface of the ServiceWorker API provides a reference to a service worker. Multiple browsing contexts (e.g. pages, workers, etc.) can be associated with the same service worker, each through a unique ServiceWorker object.\"><code>ServiceWorker</code></a> object if its state is <code>activated</code> (the same object returned by <a href=\"/en-US/docs/Web/API/ServiceWorkerRegistration/active\" title=\"The active property of the ServiceWorkerRegistration interface returns a service worker whose ServiceWorker.state is activating or activated. This property is initially set to&#xA0;null.\"><code>ServiceWorkerRegistration.active</code></a>). This property returns <code>null</code> if the request is a force refresh (<em>Shift</em> + refresh) or if there is no active worker.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}], "slug": "Web/API/ServiceWorkerContainer/controller", "review_tags": ["technical"]}