Notification.close()

close()

function spawnNotification(theBody, theIcon, theTitle) {
  const options = {
    body: theBody,
    icon: theIcon,
  };
  const n = new Notification(theTitle, options);
  document.addEventListener("visibilitychange", () => {
    if (document.visibilityState === "visible") {
      // The tab has become visible so clear the now-stale Notification.
      n.close();
    }
  });
}