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+---
+title: NetworkInformation.downlinkMax
+slug: Web/API/NetworkInformation/downlinkMax
+tags:
+  - API
+  - Experimental
+  - Network Information API
+  - NetworkInformation
+  - Property
+  - Read-only
+  - Reference
+translation_of: Web/API/NetworkInformation/downlinkMax
+---
+<p>{{APIRef("Network Information API")}}{{SeeCompatTable}}</p>
+
+<p><strong><code>NetworkInformation.downlinkMax</code></strong> 読み取り専用プロパティは、メガビット毎秒（Mbps）単位で、基底の接続技術の最大下り速度を返します。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox">var <em>max</em> = NetworkInformation.<em>downlinkMax</em></pre>
+
+<h3 id="戻り値">戻り値</h3>
+
+<ul>
+ <li>メガビット毎秒（Mbps）単位で、基底の接続技術の最大下り速度を表す<code>無制限のdouble</code>。</li>
+</ul>
+
+<h2 id="例">例</h2>
+
+<p>次の例は、<code>change</code> イベントで接続をモニターして、発生した変更をロギングしています。</p>
+
+<pre class="brush: js"><code>function logConnectionType() {
+  var connectionType = 'not supported';
+  var downlinkMax = 'not supported';
+
+  if ('connection' in navigator) {
+    connectionType = navigator.connection.type;
+
+    if ('downlinkMax' in navigator.connection) {
+      downlinkMax = navigator.connection.downlinkMax;
+    }
+  }
+
+  console.log('Current connection type: ' + connectionType +
+    ' (downlink max: ' + downlinkMax + ')');
+}
+
+logConnectionType();
+navigator.connection.addEventListener('change', logConnectionType);</code></pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">ステータス</th>
+   <th scope="col">コメント</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('Network Information', '#widl-NetworkInformation-downlinkMax', 'downlinkMax')}}</td>
+   <td>{{Spec2('Network Information')}}</td>
+   <td>最初の定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザ実装状況">ブラウザ実装状況</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</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatChrome(48.0)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</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>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(48.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>