From 33d52ff611c0da0039a2c07ebd7ca0c9645e2cff Mon Sep 17 00:00:00 2001
From: Masahiro FUJIMOTO <mfujimot@gmail.com>
Date: Sun, 18 Apr 2021 00:31:39 +0900
Subject:  DOMTokenList.supports を新規翻訳 (#424)
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2021/03/11 時点の英語版に基づき新規翻訳
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+---
+title: DOMTokenList.supports()
+slug: Web/API/DOMTokenList/supports
+tags:
+  - API
+  - DOM
+  - Method
+  - Reference
+translation_of: Web/API/DOMTokenList/supports
+---
+<p>{{APIRef("DOM")}}{{SeeCompatTable}}</p>
+
+<p><span class="seoSummary"><strong><code>supports()</code></strong> は {{domxref("DOMTokenList")}} インターフェイスのメソッドで、渡された <code><var>token</var></code> が関連する属性で対応しているトークンに含まれていれば <code>true</code> を返します。このメソッドは機能に対応しているかを検出するためのものです。</span></p>
+
+<h2 id="Syntax">構文</h2>
+
+<pre
+  class="brush: js">let <var>trueOrFalse</var> = <var>element</var>.supports(<var>token</var>)</pre>
+
+<h3 id="Parameters">引数</h3>
+
+<dl>
+  <dt><code><var>token</var></code></dt>
+  <dd>{{domxref("DOMString")}} で、問い合わせるトークンが入ります。</dd>
+</dl>
+
+<h3 id="Returns">返値</h3>
+
+<p>{{jsxref("Boolean")}} で、トークンが見つかったかどうかを返します。</p>
+
+<h2 id="Example">例</h2>
+
+<pre class="brush: js">let iframe = document.getElementById('display');
+
+if (iframe.sandbox.supports('an-upcoming-feature')) {
+  // support code for mystery future feature
+} else {
+  // fallback code
+}
+
+if (iframe.sandbox.supports('allow-scripts')) {
+  // instruct frame to run JavaScript
+  //
+  // (NOTE: This feature is well-supported; this is just an example!)
+  //
+}</pre>
+
+<h2 id="Specifications">仕様書</h2>
+
+<table class="standard-table">
+  <thead>
+    <tr>
+      <th scope="col">仕様書</th>
+      <th scope="col">状態</th>
+      <th scope="col">備考</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>{{SpecName('Credential Management')}}</td>
+      <td>{{Spec2('Credential Management')}}</td>
+      <td>初回定義</td>
+    </tr>
+  </tbody>
+</table>
+
+<h2 id="Browser_compatibility">ブラウザーの互換性</h2>
+
+<p>{{Compat("api.DOMTokenList.supports")}}</p>
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