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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+---
+title: Window.isSecureContext
+slug: Web/API/Window/isSecureContext
+tags:
+  - API
+  - Property
+  - Reference
+  - Security
+  - Window
+translation_of: Web/API/Window/isSecureContext
+---
+<p>{{APIRef}}{{SeeCompatTable}}</p>
+
+<p><code><strong>window.isSecureContext</strong></code> 読み取り専用プロパティは、コンテキストが <a href="/ja/docs/Web/Security/Secure_Contexts">安全なコンテキスト</a> を必要とする機能を使用できるかどうかを示します。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox">var <em>isSecure</em> = window.isSecureContext</pre>
+
+<h2 id="例">例</h2>
+
+<h3 id="機能検出">機能検出</h3>
+
+<p>グローバルスコープの <code>isSecureContext</code> の真偽値を用いることで、安全なコンテクストかどうかをチェックすることで機能検出できます。</p>
+
+<pre class="brush: js">if (window.isSecureContext) {
+  // Page is a secure context so service workers are now available
+  navigator.serviceWorker.register("/offline-worker.js").then(function () {
+    ...
+  });
+}</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th>仕様</th>
+   <th>ステータス</th>
+   <th>コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Secure Contexts')}}</td>
+   <td>{{Spec2('Secure Contexts','#monkey-patching-global-object','isSecureContext')}}</td>
+   <td>初期定義。</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザー実装状況">ブラウザー実装状況</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(49)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><a href="/ja/docs/Web/API/Window/opener">window.opener</a> の考慮</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop(49)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(49)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+  <tr>
+   <td><a href="/ja/docs/Web/API/Window/opener">window.opener</a> の考慮</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(49)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/Security/Secure_Contexts">安全なコンテクスト</a></li>
+</ul>
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