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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: Range.setStart
+slug: Web/API/Range/setStart
+translation_of: Web/API/Range/setStart
+---
+<p>{{ apiref("Range") }}</p>
+
+<p><strong><code>Range.setStart()</code></strong> メソッドは{{ domxref("Range") }}の開始位置を指定します。</p>
+
+<p><code>startNode</code> が <code>Text</code>, <code>Comment</code>, あるいは <code>CDATASection</code> タイプの {{ domxref("Node") }}  であるとき、<code>startOffset</code>は<code>startNode</code>の開始位置からの文字数です。その他の<code>Node</code>タイプの場合、 <code>startOffset</code>は<code>startNode</code>からの子ノード数です。</p>
+
+<p>開始位置を終了位置よりも下(ドキュメントよりも下)に指定すると <code>ERROR_ILLEGAL_VALUE</code> {{domxref("DOMException")}} 例外が投げられます。</p>
+
+<h2 id="Syntax" name="Syntax">Syntax</h2>
+
+<pre class="syntaxbox notranslate"><em>range</em>.setStart(<em>startNode</em>, <em>startOffset</em>);
+</pre>
+
+<h3 id="Parameters" name="Parameters">Parameters</h3>
+
+<dl>
+ <dt><em>startNode</em></dt>
+ <dd>{{ domxref("Range") }} を開始する {{ domxref("Node") }}</dd>
+ <dt><em>startOffset</em><code> </code></dt>
+ <dd>{{ domxref("Range") }}の開始位置を示す<code>startNode</code>オフセット(非負整数)</dd>
+</dl>
+
+<h2 id="Example" name="Example">Example</h2>
+
+<pre class="brush: js notranslate">var range = document.createRange();
+var startNode = document.getElementsByTagName("p").item(2);
+var startOffset = 0;
+range.setStart(startNode,startOffset);
+</pre>
+
+<h2 id="Specification" name="Specification">Specifications</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('DOM WHATWG', '#dom-range-setstart', 'Range.setStart()')}}</td>
+ <td>{{Spec2('DOM WHATWG')}}</td>
+ <td>No change.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM2 Traversal_Range', 'ranges.html#Level2-Range-method-setStart', 'Range.setStart()')}}</td>
+ <td>{{Spec2('DOM2 Traversal_Range')}}</td>
+ <td>Initial specification.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoDesktop("1.0")}}</td>
+ <td>9.0</td>
+ <td>9.0</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoMobile("1.0")}}</td>
+ <td>9.0</td>
+ <td>9.0</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/DOM/DOM_Reference" title="/en-US/docs/DOM/DOM_Reference">The DOM interfaces index</a></li>
+</ul>