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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Document.head
+slug: Web/API/Document/head
+tags:
+ - API
+ - Document
+ - HTML DOM
+ - Reference
+ - head
+translation_of: Web/API/Document/head
+---
+<div>{{APIRef("DOM")}}</div>
+
+<p><span class="seoSummary">{{domxref("Document")}} インターフェイスの <code><strong>head</strong></code> は読み取り専用のプロパティで、現在の文書の {{HTMLElement("head")}} 要素を返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">var <var>objRef</var> = <var>document</var>.head;
+</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>{{domxref("HTMLHeadElement")}} です。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: html">&lt;!doctype html&gt;
+&lt;head id="my-document-head"&gt;
+ &lt;title&gt;Example: using document.head&lt;/title&gt;
+&lt;/head&gt;
+
+&lt;script&gt;
+ var theHead = document.head;
+
+ console.log(theHead.id); // "my-document-head";
+
+ console.log( theHead === document.querySelector("head") ); // true
+&lt;/script&gt;
+</pre>
+
+<h2 id="Notes" name="Notes">メモ</h2>
+
+<p><code>document.head</code> は読取専用です。このプロパティに値を代入した場合は、暗黙に失敗するか、 <a href="/ja/docs/Web/JavaScript/Reference/Strict_mode">Strict モード</a>の場合は、 {{jsxref("TypeError")}} を投げます。</p>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="spectable 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('HTML5.1','dom.html#dom-document-head','Document.head')}}</td>
+ <td>{{Spec2('HTML5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5 W3C','dom.html#dom-document-head','Document.head')}}</td>
+ <td>{{Spec2('HTML5 W3C')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG','dom.html#dom-document-head','Document.head')}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td>初回定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの対応</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>
+
+<div>{{Compat("api.Document.head")}}</div>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{domxref("document.body")}}</li>
+</ul>