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: Document.queryCommandState()
+slug: Web/API/Document/queryCommandState
+tags:
+  - API
+  - DOM
+  - Reference
+translation_of: Web/API/Document/queryCommandState
+---
+<div>{{ApiRef("DOM")}}{{obsolete_header}}</div>
+
+<p><strong><code>queryCommandState()</code></strong> メソッドは、現在の選択範囲に特定の {{domxref("Document.execCommand()")}} コマンドが適用されているかどうかを知らせます。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="brush: js notranslate">queryCommandState(String <var>command</var>)
+</pre>
+
+<h3 id="Parameters" name="Parameters">引数</h3>
+
+<p><code><var>command</var></code> は {{domxref("Document.execCommand()")}} のコマンドです。</p>
+
+<h3 id="Return_value" name="Return_value">返値</h3>
+
+<p><code>queryCommandState()</code> は {{jsxref("Boolean")}} 値、または状態が不明な場合は <code>null</code> を返す可能性があります。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html notranslate">&lt;div contenteditable="true"&gt;Select a part of this text!&lt;/div&gt;
+&lt;button onclick="makeBold();"&gt;Test the state of the 'bold' command&lt;/button&gt;
+</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="brush: js notranslate">function makeBold() {
+  var state = document.queryCommandState("bold");
+  switch (state) {
+    case true:
+      alert("The bold formatting will be removed from the selected text.");
+      break;
+    case false:
+      alert("The selected text will be displayed in bold.");
+      break;
+    case null:
+      alert("The state of the 'bold' command is indeterminable.");
+      break;
+  }
+  document.execCommand('bold');
+}</pre>
+
+<h3 id="Result" name="Result">結果</h3>
+
+<p>{{EmbedLiveSample('Example')}}</p>
+
+<h2 id="Specifications" name="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><a href="https://w3c.github.io/editing/execCommand.html#querycommandstate()">execCommand</a></td>
+   <td></td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div>
+
+<p>{{Compat("api.Document.queryCommandState")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{domxref("HTMLElement.contentEditable")}}</li>
+ <li>{{domxref("document.designMode")}}</li>
+ <li><a href="/ja/docs/Rich-Text_Editing_in_Mozilla">Mozilla のリッチテキスト編集</a></li>
+ <li><code>queryCommandState()</code> に関するブラウザーのバグ: <a href="https://github.com/guardian/scribe/blob/master/BROWSERINCONSISTENCIES.md#documentquerycommandstate">Scribe's "Browser Inconsistencies" documentation</a></li>
+</ul>
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