Note: This feature is only available in Web Workers.
The permissions read-only property of the WorkerNavigator interface returns a Permissions object that can be used to query and update permission status of APIs covered by the Permissions API.
A Permissions object.
navigator.permissions.query({ name: "notifications" }).then((result) => {
if (result.state === "granted") {
showNotification();
} else if (result.state === "prompt") {
requestNotificationPermission();
}
});