Web/API/Attr/prefix

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.

Syntax

string = attribute.prefix

Examples

The following logs "x" to the console.

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

Notes

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.

Specifications

Specification	Status	Comment
DOMThe definition of 'Attr: prefix' in that specification.	Living Standard
DOM4The definition of 'Attr.prefix' in that specification.	Obsolete

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
prefix	Chrome Full support 46 Notes' Full support 46 Notes' Notes' This API was previously available on the Node API.	Edge Full support ≤18	Firefox Full support 48 Notes' Full support 48 Notes' Notes' This API was previously available on the Node API.	IE No support No	Opera Full support 33 Notes' Full support 33 Notes' Notes' This API was previously available on the Node API.	Safari Full support 1.3	WebView Android Full support 46 Notes' Full support 46 Notes' Notes' This API was previously available on the Node API.	Chrome Android Full support 46 Notes' Full support 46 Notes' Notes' This API was previously available on the Node API.	Firefox Android Full support 48 Notes' Full support 48 Notes' Notes' This API was previously available on the Node API.	Opera Android Full support 33 Notes' Full support 33 Notes' Notes' This API was previously available on the Node API.	Safari iOS Full support 1	Samsung Internet Android Full support 5.0 Notes' Full support 5.0 Notes' Notes' This API was previously available on the Node API.

Legend

Full support  

Full support

No support  

No support

See implementation notes.'

See implementation notes.

See also

• Attr.namespaceURI
• Attr.localName
• Element.prefix
• Node.prefix

Attr.prefix by Mozilla Contributors is licensed under CC-BY-SA 2.5.