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

BCD tables only load in the browser