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NamedNodeMap

Baseline

Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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The NamedNodeMap interface represents a collection of Attr objects. Objects inside a NamedNodeMap are not in any particular order, unlike NodeList, although they may be accessed by an index as in an array.

A NamedNodeMap object is live and will thus be auto-updated if changes are made to its contents internally or elsewhere.

Note: Although called NamedNodeMap, this interface doesn't deal with Node objects but with Attr objects, which are a specialized class of Node objects.

Instance properties

This interface doesn't inherit any property.

NamedNodeMap.length Read only: Returns the number of objects in the map.

Instance methods

This interface doesn't inherit any method.

NamedNodeMap.getNamedItem(): Returns an Attr, corresponding to the given name.
NamedNodeMap.setNamedItem(): Replaces, or adds, the Attr identified in the map by the given name.
NamedNodeMap.removeNamedItem(): Removes the Attr identified by the given map.
NamedNodeMap.item(): Returns the Attr at the given index, or null if the index is higher or equal to the number of nodes.
NamedNodeMap.getNamedItemNS(): Returns an Attr identified by a namespace and related local name.
NamedNodeMap.setNamedItemNS(): Replaces, or adds, the Attr identified in the map by the given namespace and related local name.
NamedNodeMap.removeNamedItemNS(): Removes the Attr identified by the given namespace and related local name.

Specifications

Specification
DOM # interface-namednodemap

Browser compatibility

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This page was last modified on Sep 4, 2026 by MDN contributors.

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