W3cubDocs

NamedNodeMap.length

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

<pre zero="test" one="test" two="test"></pre>

const pre = document.getElementsByTagName("pre")[0];
const attrMap = pre.attributes;

let result = "The `test` attribute contains " + attrMap.length + " attributes.\n";

pre.textContent = result;

Specifications

Specification
DOM Standard # dom-namednodemap-length

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`length`	1	12	1	5	≤12.1	1	1	18	4	≤12.1	1	1.0

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https://developer.mozilla.org/en-US/docs/Web/API/NamedNodeMap/length