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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WindowClient/focused below:

WindowClient: focused property - Web APIs

WindowClient: focused property

Baseline Widely available

Note: This feature is only available in Service Workers.

The focused read-only property of the WindowClient interface is a boolean value that indicates whether the current client has focus.

Value

A boolean value.

Examples
self.addEventListener("notificationclick", (event) => {
  console.log("On notification click: ", event.notification.tag);
  event.notification.close();

  // This looks to see if the current is already open and
  // focuses if it is
  event.waitUntil(
    clients
      .matchAll({
        type: "window",
      })
      .then((clientList) => {
        for (const client of clientList) {
          if (client.url === "/" && "focus" in client) {
            if (!client.focused) return client.focus();
          }
        }

        if (clients.openWindow) return clients.openWindow("/");
      }),
  );
});
Specifications Browser compatibility

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