Document.createElementNS()

Creates an element with the specified namespace URI and qualified name.

To create an element without specifying a namespace URI, use the createElement method.

Syntax

var element = document.createElementNS(namespaceURI, qualifiedName[, options]);

Parameters

namespaceURI

A string that specifies the namespace URI to associate with the element. The namespaceURI property of the created element is initialized with the value of namespaceURI. See Valid Namespace URI's.

qualifiedName

A string that specifies the type of element to be created. The nodeName property of the created element is initialized with the value of qualifiedName.

optionsOptional

An optional ElementCreationOptions object containing a single property named is, whose value is the tag name for a custom element previously defined using customElements.define(). For backwards compatibility with previous versions of the Custom Elements specification, some browsers will allow you to pass a string here instead of an object, where the string's value is the custom element's tag name. See Extending native HTML elements for more information on how to use this parameter.

The new element will be given an is attribute whose value is the custom element's tag name. Custom elements are an experimental feature only available in some browsers.

Return value

The new Element.

Valid Namespace URI's

• HTML - Use https://www.w3.org/1999/xhtml
• SVG - Use https://www.w3.org/2000/svg
• XBL - Use https://www.mozilla.org/xbl
• XUL - Use https://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul

Example

This creates a new <div> element in the XHTML namespace and appends it to the vbox element. Although this is not an extremely useful XUL document, it does demonstrate the use of elements from two different namespaces within a single document:

<?xml version="1.0"?>
<page xmlns="https://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
      xmlns:html="https://www.w3.org/1999/xhtml"
      title="||Working with elements||"
      onload="init()">

<script type="text/javascript"><![CDATA[
 var container;
 var newdiv;
 var txtnode;

 function init(){
   container = document.getElementById("ContainerBox");
   newdiv = document.createElementNS("https://www.w3.org/1999/xhtml","div");
   txtnode = document.createTextNode("This is text that was constructed dynamically with createElementNS and createTextNode then inserted into the document using appendChild.");
   newdiv.appendChild(txtnode);
   container.appendChild(newdiv);
 }

]]></script>

 <vbox id='ContainerBox' flex='1'>
  <html:div>
   The script on this page will add dynamic content below:
  </html:div>
 </vbox>

</page>

Specifications

Browser compatibility

[1] In previous versions of the specification, this argument was just a string whose value was the custom element's tag name. For the sake of backwards compatibility, Chrome accepts both forms.

[2] See [1] above: like Chrome, Firefox accepts a string instead of an object here, but only from version 51 onwards. In version 50,  options must be an object.

[3] To experiment with custom elements in Firefox, you must set the dom.webcomponents.enabled and dom.webcomponents.customelements.enabled preferences to true.

See also

• document.createElement
• document.createTextNode
• Node.namespaceURI
• Namespaces in XML