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The Attr.prefix read-only property returns the namespace prefix of the specified attribute, or null if no prefix is specified.

Before DOM4 this API was defined within the Node interface.


string = attribute.prefix


The following logs "x" to the console.

<div x:id="example" onclick="console.log(this.attributes[0].prefix)"/>


This will only work when a namespace-aware parser is used, i.e. when a document is served with an XML MIME type. This will not work for HTML documents.


Specification Status Comment
The definition of 'Attr.prefix' in that specification.
Recommendation Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 46.0[1] (Yes) 48.0 (48.0)[1] ? (Yes) ?
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? (Yes) 48.0 (48.0)[1] ? ? ?

[1] This API was previously available on the Node API.

See also

Document Tags and Contributors

 Contributors to this page: erikadoyle, Sebastianz
 Last updated by: erikadoyle,