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setAttributeNS adds a new attribute or changes the value of an attribute with the given namespace and name.

Syntax

element.setAttributeNS(
namespace,
name,
value)
  • namespace is a string specifying the namespace of the attribute.
  • name is a string identifying the attribute to be set.
  • value is the desired string value of the new attribute.

Example

var d = document.getElementById("d1"); 
d.setAttributeNS("https://www.mozilla.org/ns/specialspace", "align", "center");

Notes

DOM methods dealing with element's attributes:

Not namespace-aware, most commonly used methods Namespace-aware variants (DOM Level 2) DOM Level 1 methods for dealing with Attr nodes directly (seldom used) DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used)
setAttribute (DOM 1) setAttributeNS setAttributeNode setAttributeNodeNS
getAttribute (DOM 1) getAttributeNS getAttributeNode getAttributeNodeNS
hasAttribute (DOM 2) hasAttributeNS - -
removeAttribute (DOM 1) removeAttributeNS removeAttributeNode -

Specification

DOM Level 2 Core: setAttributeNS

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