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Showing content from http://developer.mozilla.org/ja/docs/Web/API/WindowClient/visibilityState below:

WindowClient: visibilityState プãƒãƒ‘ティ - Web API

Baseline Widely available

visibilityState は WindowClient インターフェイスの読み取り専用プロパティで、現在のクライアントの可視性を示します。 この値は、"hidden"、"visible"、"prerender" のいずれかです。

文字列です（値については Document.visibilityState を参照）。

event.waitUntil(
  clients
    .matchAll({
      type: "window",
    })
    .then((clientList) => {
      for (const client of clientList) {
        if (client.url === "/" && "focus" in client) {
          if (client.visibilityState === "hidden") return client.focus();
        }
      }
      if (clients.openWindow) {
        return clients.openWindow("/");
      }
    }),
);

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