NamedNodeMap: length property

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.

The read-only length property of the NamedNodeMap interface is the number of objects stored in the map.

Value

A number containing the number of objects in the map

Example

html
<pre zero="test" one="test" two="test"></pre>
js
const pre = document.querySelector("pre");
const attrMap = pre.attributes;
pre.textContent = `The 'test' attribute contains ${attrMap.length} attributes.\n`;

Specifications

Specification
DOM Standard
# dom-namednodemap-length

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
length

Legend

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Full support
Full support