From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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(limited to 'files/ja/web/api/windowclient/visibilitystate')

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+---
+title: WindowClient.visibilityState
+slug: Web/API/WindowClient/visibilityState
+tags:
+  - API
+  - Property
+  - Reference
+  - Service Workers
+  - ServiceWorker
+  - WindowClient
+  - visibilityState
+translation_of: Web/API/WindowClient/visibilityState
+---
+<div>{{APIRef("Service Workers API")}}</div>
+
+<p><span class="seoSummary">{{domxref("WindowClient")}} インターフェイスの <strong><code>visibilityState</code></strong> 読み取り専用プロパティは、現在のクライアントの可視性を示します。 この値は、<code>"hidden"</code>、<code>"visible"</code>、<code>"prerender"</code> のいずれかです。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">var <em>myVisState</em> = <em>windowClient</em>.visibilityState;</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>{{domxref("DOMString")}}（値については、{{domxref("Document.visibilityState")}} を参照）。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: js">event.waitUntil(clients.matchAll({
+    type: "window"
+  }).then(function(clientList) {
+    for (let i = 0; i &lt; clientList.length; i++) {
+      let client = clientList[i];
+      if (client.url == '/' &amp;&amp; 'focus' in client) {
+        if (client.visibilityState === 'hidden')
+          return client.focus();
+        }
+      }
+    }
+
+    if (clients.openWindow) {
+      return clients.openWindow('/');
+    }
+  }));
+});</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table" style="line-height: 19.0909080505371px;">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#dom-windowclient-visibilitystate', 'visibilityState')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div>
+
+
+<p>{{Compat("api.WindowClient.visibilityState")}}</p>
+</div>
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