extends ClientAvailable on js
WindowClientinterface of the ServiceWorker API represents the scope of a service worker client that is a document in a browser context, controlled by an active worker. The service worker client independently selects and uses a service worker for its own loading and sub-resources.
A boolean that indicates whether the current client has focus.
read only visibilityState:VisibilityState
Indicates the visibility of the current client. This value can be one of
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