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+---
+title: id
+slug: Web/HTML/Global_attributes/id
+translation_of: Web/HTML/Global_attributes/id
+original_slug: Web/HTML/Globale_Attribute/id
+---
+<p class="note">{{HTMLSidebar("Global_attributes")}}</p>
+
+<p>Das <strong>id</strong> <a href="/en-US/docs/Web/HTML/Global_attributes">globale Attribut</a> definiert einen eindeutigen Bezeichner (ID) welcher eindeutig im gesamten Dokument sein muss. Das Ziel ist die Identifizierung eines Elementes in Verknüpfungen (durch einen Fragmentbezeichner), Skripting, oder Stylisierung (mit CSS).</p>
+
+<p>Der Wert des Attributes ist eine undurchsichtige Zeichenkette: dies bedeutet, dass der Webautor es nicht benutzen darf um Informationen abzuleiten. Bestimmte Bedeutung, zum Beispiel bedeutungsspezifische Eigenschaften, dürfen nicht von der Zeichenkette abgeleitet sein.</p>
+
+<p>Der Attributwert darf keine Leerzeichen enthalten. Browsers treat non-conforming IDs that contains white spaces as if the white space is part of the ID. In contrast to the <strong>class</strong> attribute, which allows space-separated values, elements can only have one single ID defined through the <strong>id</strong> attribute. Note that an element may have several IDs, but the others should be set by another means, such as via a script interfacing with the DOM interface of the element.</p>
+
+<div class="note">
+<p><strong>Note:</strong> Using characters except ASCII letters and digits, <code>'_'</code>, <code>'-'</code> and <code>'.'</code> may cause compatibility problems, as they weren't allowed in HTML 4. Though this restriction has been lifted in HTML 5, an ID should start with a letter for compatibility.</p>
+</div>
+
+<h2 id="Specifications">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('HTML WHATWG', "dom.html#the-id-attribute", "id")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td>No change from latest snapshot, {{SpecName('HTML5.1')}}</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5.1', "dom.html#the-id-attribute", "id")}}</td>
+ <td>{{Spec2('HTML5.1')}}</td>
+ <td>Snapshot of {{SpecName('HTML WHATWG')}}, no change from {{SpecName('HTML5 W3C')}}</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5 W3C', "dom.html#the-id-attribute", "id")}}</td>
+ <td>{{Spec2('HTML5 W3C')}}</td>
+ <td>Snapshot of {{SpecName('HTML WHATWG')}}, now accept <code>'_'</code>, <code>'-'</code> and <code>'.'</code> if not at the beginning fo the id. It is also a true global attribute.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML4.01', 'struct/global.html#adef-id', 'id')}}</td>
+ <td>{{Spec2('HTML4.01')}}</td>
+ <td>Supported on all elements but {{HTMLElement("base")}}, {{HTMLElement("head")}}, {{HTMLElement("html")}}, {{HTMLElement("meta")}}, {{HTMLElement("script")}}, {{HTMLElement("style")}}, and {{HTMLElement("title")}}.</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>{{ CompatVersionUnknown }}[1]</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</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>Chrome for 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>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown }}[1]</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] <strong>class</strong> is a true global attribute only since Firefox 32.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>All <a href="/en-US/docs/Web/HTML/Global_attributes">global attributes</a>.</li>
+ <li>{{domxref("Element.id")}} that reflects this attribute.</li>
+</ul>