The WorkerNavigator.permissions read-only property returns a Permissions object that can be used to query and update permission status of APIs covered by the Permissions API. 
 The WorkerNavigator.permissions read-only property returns a Permissions object that can be used to query and update permission status of APIs covered by the Permissions API. 
A Permissions object.
js
navigator.permissions.query({ name: "notifications" }).then((result) => { if (result.state === "granted") { showNotification(); } else if (result.state === "prompt") { requestNotificationPermission(); } });
| Specification | 
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| Permissions  # dom-workernavigator-permissions  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/WorkerNavigator/permissions