WindowClient: visibilityState プロパティ

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.

visibilityStateWindowClient 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)。

js
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("/");
      }
    }),
);

仕様書

Specification
Service Workers
# client-visibilitystate

ブラウザーの互換性

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
visibilityState

Legend

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Full support
Full support
No support
No support