Web/API/DOMTokenList/add

The add() method of the DOMTokenList interface adds the given token to the list.

Syntax

tokenList.add(token1[, token2[, ...tokenN]]);

Parameters

tokenN: A DOMString representing the token (or tokens) to add to the tokenList.

Return value

undefined

Examples

In the following example we retrieve the list of classes set on a <span> element as a DOMTokenList using Element.classList. We then add a new token to the list, and write the list into the <span>'s Node.textContent.

First, the HTML:

<span class="a b c"></span>

Now the JavaScript:

let span = document.querySelector("span");
let classes = span.classList;
classes.add("d");
span.textContent = classes;

The output looks like this:

You can add multiple tokens as well:

span.classList.add("d", "e", "f");

Specifications

Specification	Status	Comment
DOMThe definition of 'add()' in that specification.	Living Standard	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`add`	Chrome Full support 8	Edge Full support 12	Firefox Full support Yes	IE Full support 10	Opera Full support Yes	Safari Full support 5.1	WebView Android Full support 3	Chrome Android Full support 18	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support 5.1	Samsung Internet Android Full support 1.0
Multiple arguments for `add()`	Chrome Full support 24	Edge Full support 12	Firefox Full support 26	IE No support No	Opera Full support 15	Safari Full support 7	WebView Android Full support ≤37	Chrome Android Full support 25	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support 7	Samsung Internet Android Full support 1.5

Legend

Full support: Full support
No support: No support

DOMTokenList.add() by Mozilla Contributors is licensed under CC-BY-SA 2.5.