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

WindowClient: focus() method - Web APIs

Baseline Widely available

Note: This feature is only available in Service Workers.

The focus() method of the WindowClient interface gives user input focus to the current client and returns a Promise that resolves to the existing WindowClient.

None.

A Promise that resolves to the existing WindowClient.

InvalidAccessError DOMException

The promise is rejected with this exception if none of the windows in the app's origin have transient activation.

• At least one window in the app's origin must have transient activation.

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) return client.focus();
        }
        if (clients.openWindow) return clients.openWindow("/");
      }),
  );
});

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