The Attr.localName read-only property returns the local part of the qualified name of an element.

In previous DOM specifications this API was defined within the Node interface.


name = attribute.localName

Return value

A DOMString representing the local part of the attribute's qualified name.


The following example shows "id" in an alert dialog.

HTML Content

<button id="example">Click me</button>

JavaScript Content

const element = document.querySelector("#example");
element.addEventListener("click", function() {
  const attribute = element.attributes[0];


The local name of an attribute is the part of the attribute's qualified name that comes after the colon. Qualified names are typically used in XML as part of the namespace(s) of the particular XML documents.

Note: In Gecko 1.9.2 and earlier, the property returns the upper-cased version of the local name for HTML attributes in HTML DOMs (as opposed to XHTML attributes in XML DOMs). In later versions, in compliance with HTML5, the property returns in the case of the internal DOM storage, which is lower case for both HTML attributes in HTML DOMs and XHTML attributes in XML DOMs.


Specification Status Comment
The definition of 'Attr.localName' in that specification.
Living Standard Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support461 ?481 ? Yes ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ?481 ? ? ?

1. This API was previously available on the Node API.

See also

Document Tags and Contributors

Last updated by: connorshea,