NamedNodeMap: length property

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 class="foo" id="bar" contenteditable></pre>
js
const pre = document.querySelector("pre");
const attrMap = pre.attributes;
pre.textContent = `The 'test' attribute contains ${attrMap.length} attributes.\n`;

Specifications