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Showing content from https://webplatform.github.io/docs/apis/xhr/properties/XMLNS_attribute below:

XMLNS attribute · WebPlatform Docs

XMLNS attribute

Syntax

var result = element.XMLNS attribute;
element.XMLNS attribute = value;

Examples

This example shows how to declare a namespace when one of the default behaviors in Internet Explorer, clientCaps, is used as a custom tag in an HTML document. Note that the declared namespace (in this case, MSIE) is a prefix to the name of the default behavior in the custom tag. This example also shows how the clientCaps behavior can be used to install the Internet Explorer Data Binding component, if the component does not already exist in the user’s system.

<HTML XMLNS:MSIE>
<HEAD>
<STYLE>
@media all {
   MSIE\:clientCaps {behavior:url(#default#clientcaps);}
}
</STYLE>
<SCRIPT>
function window.onload()
{
   var bDataBindingAvailable  = false;
   var sDataBindingVersion = '';
   var sDataBindingID =
       "{333C7BC4-460F-11D0-BC04-0080C7055A83}";
   bDataBindingAvailable =
       oClientCaps.isComponentInstalled(sDataBindingID,"clsid");
   
   if (!bDataBindingAvailable)
   {
      oClientCaps.addComponentRequest (sDataBindingID,
          "componentid");
      bDataBindingAvailable = oClientCaps.doComponentRequest();
   }
   :
}
</SCRIPT>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
   :
   <MSIE:CLIENTCAPS ID="oClientCaps" />
   :
</BODY>

View live example

Notes Remarks

You can declare multiple namespaces on the html tag, as shown in the following syntax.

<HTML XMLNS:Prefix1 XMLNS:Prefix2="www.microsoft.com">

The syntax for XMLNS is based on the W3C XML Namespace Spec. Although the World Wide Web Consortium (W3C) document allows you to declare namespaces on all tags, Microsoft Internet Explorer 5 supports namespace declaration only on the html tag.