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+---
+title: 'Document: selectstart event'
+slug: Web/API/Document/selectstart_event
+translation_of: Web/API/Document/selectstart_event
+---
+<div>{{APIRef}}</div>
+
+<div>
+<p><a href="/en-US/docs/Web/API/Selection">Selection API</a> の <code><strong>selectstart</strong></code> イベントは新しい選択範囲をユーザが指定した際に発火します。</p>
+
+<p>イベントがキャンセルされた場合、選択範囲は変更されません。</p>
+</div>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th>Bubbles</th>
+   <td>有効</td>
+  </tr>
+  <tr>
+   <th>Cancelable</th>
+   <td>有効</td>
+  </tr>
+  <tr>
+   <th>Interface</th>
+   <td>{{domxref("Event")}}</td>
+  </tr>
+  <tr>
+   <th>Event handler property</th>
+   <td>{{domxref("GlobalEventHandlers.onselectstart", "onselectstart")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="例">例</h2>
+
+<pre class="brush: js">// addEventListener version
+document.addEventListener('selectstart', () =&gt; {
+  console.log('Selection started');
+});
+
+// onselectstart version
+document.onselectstart = () =&gt; {
+  console.log('Selection changed.');
+};
+</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Selection API', '#selectstart-event', 'selectstart')}}</td>
+   <td>{{Spec2('Selection API')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザ互換性">ブラウザ互換性</h2>
+
+<p>{{Compat("api.Document.selectstart_event")}}</p>
+
+<h2 id="参照">参照</h2>
+
+<ul>
+ <li>{{domxref("Document/selectionchange_event", "selectionchange")}}</li>
+</ul>