Join MDN and developers like you at Mozilla's View Source conference, 12-14 September in Berlin, Germany. Learn more at https://viewsourceconf.org

The Node.lookupNamespaceURI() method takes a prefix and returns the namespace URI associated with it on the given node if found (and null if not). Supplying null for the prefix will return the default namespace.

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

See also

 

Document Tags and Contributors

 Last updated by: fscholz,