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+---
+title: element.setAttributeNodeNS
+slug: Web/API/Element/setAttributeNodeNS
+tags:
+ - DOM
+ - Gecko
+ - 翻訳中
+translation_of: Web/API/Element/setAttributeNodeNS
+---
+<p><span class="comment">&lt;breadcrumbs&gt;&lt;/breadcrumbs&gt;</span>{{ ApiRef("DOM") }}<span class="comment">== Summary ==</span></p>
+
+<h3 id=".E6.A6.82.E8.A6.81" name=".E6.A6.82.E8.A6.81">概要</h3>
+
+<p><span class="comment">&lt;code&gt;setAttributeNodeNS&lt;/code&gt; adds a new attribute node with the specified namespace and name.</span> <code>setAttributeNodeNS</code> は指定の名前空間と名前で新しい属性ノードを追加します。<span class="comment">== Syntax ==</span></p>
+
+<h3 id=".E6.A7.8B.E6.96.87" name=".E6.A7.8B.E6.96.87">構文</h3>
+
+<pre class="eval"><em>replacedAttr</em> = element.setAttributeNodeNS(<em>attributeNode</em>)
+</pre>
+
+<p><span class="comment">* &lt;code&gt;replacedAttr&lt;/code&gt; is the replaced attribute node, if any, returned by this function. * &lt;code&gt;attributeNode&lt;/code&gt; is an &lt;code&gt;Attr&lt;/code&gt; node.</span></p>
+
+<ul>
+ <li><code>replacedAttr</code> は、この関数によって返されるのであれば、置き換えられた属性ノードです。</li>
+ <li><code>attributeNode</code> は <code>Attr</code> ノードです.</li>
+</ul>
+
+<h3 id="Example" name="Example">Example</h3>
+
+<pre>// &lt;div id="one" special-align="utterleft"&gt;one&lt;/div&gt;
+// &lt;div id="two"&gt;two&lt;/div&gt;
+
+var myns = "http://www.mozilla.org/ns/specialspace";
+var d1 = document.getElementById("one");
+var d2 = document.getElementById("two");
+var a = d1.getAttributeNodeNS(myns, "special-align");
+d2.setAttributeNodeNS(a);
+
+alert(d2.attributes[1].value) // returns: `utterleft'
+</pre>
+
+<h3 id=".E6.B3.A8.E8.A8.98" name=".E6.B3.A8.E8.A8.98">注記</h3>
+
+<p><span class="comment">If the specified attribute already exists on the element, then that attribute is replaced with the new one and the replaced one is returned.</span> 指定の属性が既に存在しているときは、その属性新しいものに置き換えられ、置き換えられたものが戻り値として返されます。</p>
+
+<p>{{ DOMAttributeMethods() }}<span class="comment">== Specification ==</span></p>
+
+<h3 id=".E4.BB.95.E6.A7.98" name=".E4.BB.95.E6.A7.98">仕様</h3>
+
+<p><a class="external" href="http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-ElSetAtNodeNS">DOM Level 2 Core: setAttributeNodeNS</a></p>