Revision 745663 of HTMLUnknownElement

<div>
<div>{{ APIRef("HTML DOM") }}</div>
</div>

<p>The <strong><code>HTMLUnknownElement</code></strong> interface represents an invalid HTML element and derives from the {{domxref("HTMLElement")}} interface, but without implementing any additional properties or methods.</p>

<h2 id="Properties">Properties</h2>

<p><em>No specific property; inherits properties from its parent, {{domxref("HTMLElement")}}.</em></p>

<h2 id="Methods">Methods</h2>

<p><em>No specific method; inherits properties from its parent, {{domxref("HTMLElement")}}.</em></p>

<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', "elements.html#htmlunknownelement", "HTMLUnknownElement")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>No change from {{SpecName("HTML5 W3C")}}.</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML5 W3C', "dom.html#htmlunknownelement", "HTMLUnknownElement")}}</td>
   <td>{{Spec2('HTML5 W3C')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>{{CompatibilityTable}}</div>

<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 (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</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>Firefox Mobile (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li>Obsolete or non-standard HTML elements implementing this interface: {{HTMLElement("bgsound")}}, {{HTMLElement("blink")}}, {{HTMLElement("isindex")}}, {{HTMLElement("multicol")}}, {{HTMLElement("nextid")}}, {{HTMLElement("rb")}}, {{HTMLElement("spacer")}}</li>
</ul>