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+---
+title: Attr
+slug: Web/API/Attr
+translation_of: Web/API/Attr
+---
+<h4 id="APIRefDOM">{{APIRef("DOM")}}</h4>
+
+<p>The <code><strong>Attr</strong></code> interface represents one of a DOM element's attributes as an object. In most DOM methods, you will directly retrieve the attribute as a string (e.g., {{domxref("Element.getAttribute()")}}), but certain functions (e.g., {{domxref("Element.getAttributeNode()")}}) or means of iterating return <code>Attr</code> types.</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<div class="warning"><strong>Warning: </strong>Starting in Gecko 7.0 {{geckoRelease("7.0")}}, a number of deprecated properties and methods output warning messages to the console. You should revise your code accordingly. See <a href="#Deprecated_properties_and_methods">Deprecated properties and methods</a> for a complete list.</div>
+
+<h2 id="Properties">Properties</h2>
+
+<dl>
+ <dt>{{domxref("Attr.name", "name")}} {{readOnlyInline}}</dt>
+ <dd>The attribute's name.</dd>
+ <dt>{{domxref("Attr.namespaceURI", "namespaceURI")}} {{readOnlyInline}}</dt>
+ <dd>A {{domxref("DOMString")}} representing the namespace URI of the attribute, or <code>null</code> if there is no namespace.</dd>
+ <dt>{{domxref("Attr.localName", "localName")}} {{readOnlyInline}}</dt>
+ <dd>A {{domxref("DOMString")}} representing the local part of the qualified name of the attribute.</dd>
+ <dt>{{domxref("Attr.prefix", "prefix")}} {{readOnlyInline}}</dt>
+ <dd>A {{domxref("DOMString")}} representing the namespace prefix of the attribute, or <code>null</code> if no prefix is specified.</dd>
+ <dt>{{domxref("Attr.ownerElement", "ownerElement")}} {{readOnlyInline}}</dt>
+ <dd>
+ <p>The element holding the attribute.</p>
+
+ <div class="note">
+ <p><strong>Note:</strong> DOM Level 4 removed this property. The assumption was that since you get an <code>Attr</code> object from an {{domxref("Element")}}, you should already know the associated element.<br>
+  As that doesn't hold true in cases like <code>Attr</code> objects being returned by {{domxref("Document.evaluate")}}, the DOM Living Standard reintroduced the property.</p>
+
+ <p>Gecko outputs a deprecation note starting from Gecko 7.0 {{geckoRelease("7.0")}}. This note was removed again in Gecko 49.0 {{geckoRelease("49.0")}}.</p>
+ </div>
+ </dd>
+ <dt>{{domxref("Attr.specified", "specified")}} {{readOnlyInline}}</dt>
+ <dd>This property always returns <code>true</code>. Originally, it returned <code>true </code>if the attribute was explicitly specified in the source code or by a script, and <code>false</code> if its value came from the default one defined in the document's <acronym title="Document Type Definition">DTD</acronym>.</dd>
+ <dt>{{domxref("Attr.value", "value")}}</dt>
+ <dd>The attribute's value.</dd>
+</dl>
+
+<div class="note">
+<p><strong>Note:</strong> DOM Level 3 defined <code>namespaceURI</code>, <code>localName</code> and <code>prefix</code> on the {{domxref("Node")}} interface. In DOM4 they were moved to <code>Attr</code>.</p>
+
+<p>This change is implemented in Chrome since version 46.0 and Firefox since version 48.0.</p>
+</div>
+
+<h2 id="Deprecated_properties_and_methods">Deprecated properties and methods</h2>
+
+<p>The following properties have been deprecated. Where available, the appropriate replacement is noted.</p>
+
+<dl>
+ <dt><code>attributes</code></dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>childNodes</code> {{obsolete_inline(14)}}</dt>
+ <dd>This property now always returns an empty {{domxref("NodeList")}}.</dd>
+ <dt><code>firstChild</code> {{obsolete_inline(14)}}</dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>isId</code> {{readOnlyInline}}</dt>
+ <dd>Indicates whether the attribute is an "ID attribute". An "ID attribute" being an attribute which value is expected to be unique across a DOM Document. In HTML DOM, "id" is the only ID attribute, but XML documents could define others. Whether or not an attribute is unique is often determined by a {{Glossary("DTD")}} or other schema description.</dd>
+ <dt><code>lastChild</code> {{obsolete_inline(14)}}</dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>nextSibling</code></dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>nodeName</code></dt>
+ <dd>Use {{domxref("Attr.name")}} instead.</dd>
+ <dt><code>nodeType</code></dt>
+ <dd>This property now always returns 2 (<code>ATTRIBUTE_NODE</code>).</dd>
+ <dt><code>nodeValue</code></dt>
+ <dd>Use {{domxref("Attr.value")}} instead.</dd>
+ <dt><code>ownerDocument</code></dt>
+ <dd>You shouldn't have been using this in the first place, so you probably don't care that this is going away.</dd>
+ <dt><code>parentNode</code></dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>previousSibling</code></dt>
+ <dd>This property now always returns <code>NULL</code>.</dd>
+ <dt><code>schemaTypeInfo</code> {{obsolete_inline}} {{readOnlyInline}}</dt>
+ <dd>The type information associated with this attribute. While the type information contained in this attribute is guaranteed to be correct after loading the document or invoking {{domxref("Document.normalizeDocument")}}, this property may not be reliable if the node was moved.</dd>
+ <dt><code>specified</code></dt>
+ <dd>This property now always returns <code>true</code>.</dd>
+ <dt><code>textContent</code></dt>
+ <dd>Use {{domxref("Attr.value")}} instead.</dd>
+</dl>
+
+<p>The following methods have been deprecated:</p>
+
+<dl>
+ <dt><code>appendChild()</code> {{obsolete_inline(14)}}</dt>
+ <dd>Modify the value of {{domxref("Attr.value")}} instead.</dd>
+ <dt><code>cloneNode()</code></dt>
+ <dd>You shouldn't have been using this in the first place, so you probably don't care that this is going away.</dd>
+ <dt><code>createAttribute()</code></dt>
+ <dd>Use {{domxref("Element.setAttribute()")}} instead.</dd>
+ <dt><code>createAttributeNS()</code></dt>
+ <dd>Use {{domxref("Element.setAttributeNS()")}} instead.</dd>
+ <dt><code>getAttributeNode()</code></dt>
+ <dd>Use {{domxref("Element.getAttribute()")}} instead.</dd>
+ <dt><code>getAttributeNodeNS()</code></dt>
+ <dd>Use {{domxref("Element.getAttributeNS()")}} instead.</dd>
+ <dt><code>hasAttributes()</code> {{obsolete_inline("21.0")}}</dt>
+ <dd>This method now always returns false.</dd>
+ <dt><code>hasChildNodes()</code></dt>
+ <dd>This method now always returns false.</dd>
+ <dt><code>insertBefore()</code></dt>
+ <dd>Modify the value of {{domxref("Attr.value")}} instead.</dd>
+ <dt><code>isSupported()</code></dt>
+ <dd>You shouldn't have been using this in the first place, so you probably don't care that this is going away.</dd>
+ <dt><code>isEqualNode()</code></dt>
+ <dd>You shouldn't have been using this in the first place, so you probably don't care that this is going away.</dd>
+ <dt><code>normalize()</code></dt>
+ <dd>You shouldn't have been using this in the first place, so you probably don't care that this is going away.</dd>
+ <dt><code>removeAttributeNode()</code></dt>
+ <dd>Use {{domxref("Element.removeAttribute()")}} instead.</dd>
+ <dt><code>removeChild()</code> {{obsolete_inline(14)}}</dt>
+ <dd>Modify the value of {{domxref("Attr.value")}} instead.</dd>
+ <dt><code>replaceChild()</code> {{obsolete_inline(14)}}</dt>
+ <dd>Modify the value of {{domxref("Attr.value")}} instead.</dd>
+ <dt><code>setAttributeNode()</code></dt>
+ <dd>Use {{domxref("Element.setAttribute()")}} instead.</dd>
+ <dt><code>setAttributeNodeNS()</code></dt>
+ <dd>Use {{domxref("Element.setAttributeNS()")}} instead.</dd>
+</dl>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("DOM WHATWG", "#interface-attr", "Attr")}}</td>
+   <td>{{Spec2("DOM WHATWG")}}</td>
+   <td>Added <code>ownerElement</code> property back</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("DOM4", "#interface-attr", "Attr")}}</td>
+   <td>{{Spec2("DOM4")}}</td>
+   <td>Moved <code>namespaceURI</code>, <code>prefix</code> and <code>localName</code> from {{domxref("Node")}} to this API and removed <code>ownerElement</code>, <code>schemaTypeInfo</code> and <code>isId</code>.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("DOM3 Core", "core.html#ID-637646024", "Attr")}}</td>
+   <td>{{Spec2("DOM3 Core")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("api.Attr")}}</p>