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Attr.localName

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.

Syntax

name = attribute.localName

Return value

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

Example

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];
  alert(attribute.localName);
});

Notes

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.

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	46 46 This API was previously available on the `Node` API.	?	48 48 This API was previously available on the `Node` API.	?	Yes	?

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	?	?	?	48 48 This API was previously available on the `Node` API.	?	?	?