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+---
+title: DocumentFragment.childElementCount
+slug: Web/API/DocumentFragment/childElementCount
+tags:
+  - API
+  - DOM
+  - Property
+  - Reference
+browser-compat: api.DocumentFragment.childElementCount
+translation_of: Web/API/DocumentFragment/childElementCount
+---
+<div>{{ APIRef("DOM") }}</div>
+
+<p><code><strong>Document.childElementCount</strong></code> は読み取り専用のプロパティで、 <code>DocumentFragment</code> の子要素の数を返します。</p>
+
+<p>特定の要素の子要素の数を取得する場合は、 {{domxref("Element.childElementCount")}} を参照してください。</p>
+
+<h2 id="Syntax">構文</h2>
+
+<pre class="brush: js"><em>fragment</em>.childElementCount;
+</pre>
+
+<h2 id="Example">例</h2>
+
+<pre class="brush:js">
+let fragment = new DocumentFragment()
+fragment.childElementCount; // 0
+
+let paragraph = document.createElement('p')
+fragment.appendChild(paragraph)
+
+fragment.childElementCount; // 1
+</pre>
+
+<h2 id="Specifications">仕様書</h2>
+
+{{Specifications}}
+
+<h2 id="Browser_compatibility">ブラウザーの互換性</h2>
+
+<p>{{Compat}}</p>
+
+<h2 id="See_also">関連情報</h2>
+
+<ul>
+  <li>{{domxref("Element.childElementCount")}}</li>
+  <li>{{domxref("Document.childElementCount")}}</li>
+</ul>