Web/API/Node/lookupNamespaceURI

The Node.lookupNamespaceURI() method accepts a prefix and returns the namespace URI associated with it on the given node if found (and null if not).

Syntax

var namespace = node.lookupNamespaceURI(prefix);

Parameters

prefix

The prefix to look for. If this parameter is null, the method will return the default namespace URI, if any.

Return value

A DOMString containing the the namespace URI. If the prefix is not found, it returns null.

Specifications

Specification	Status	Comment
DOMThe definition of 'Node: lookupNamespaceURI' in that specification.	Living Standard

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
lookupNamespaceURI	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support  

Full support

Compatibility unknown  

Compatibility unknown

In Firefox, due to bug 312019, this method does not work with dynamically assigned namespaces (i.e., those set with Node.prefix).

Node.lookupNamespaceURI() by Mozilla Contributors is licensed under CC-BY-SA 2.5.