index.md

---
title: "Element: classList property"
short-title: classList
slug: Web/API/Element/classList
page-type: web-api-instance-property
browser-compat: api.Element.classList
---

{{APIRef("DOM")}}

The **`Element.classList`** is a read-only property that
returns a live {{domxref("DOMTokenList")}} collection of the `class`
attributes of the element. This can then be used to manipulate the class list.

Using `classList` is a convenient alternative to accessing an element's list
of classes as a space-delimited string via {{domxref("element.className")}}.

## Value

A {{domxref("DOMTokenList")}} representing the contents of the element's
`class` attribute. If the `class` attribute is not set or empty,
it returns an empty `DOMTokenList`, i.e. a `DOMTokenList` with
the `length` property equal to `0`.

Although the `classList` property itself is read-only, you can modify its associated `DOMTokenList` using the {{domxref("DOMTokenList/add", "add()")}}, {{domxref("DOMTokenList/remove", "remove()")}}, {{domxref("DOMTokenList/replace", "replace()")}}, and {{domxref("DOMTokenList/toggle", "toggle()")}} methods.

You can test whether the element contains a given class using the {{domxref("DOMTokenList/contains", "classList.contains()")}} method.

## Examples

```js
const div = document.createElement("div");
div.className = "foo";

// our starting state: <div class="foo"></div>
console.log(div.outerHTML);

// use the classList API to remove and add classes
div.classList.remove("foo");
div.classList.add("anotherclass");

// <div class="anotherclass"></div>
console.log(div.outerHTML);

// if visible is set remove it, otherwise add it
div.classList.toggle("visible");

// add/remove visible, depending on test conditional, i less than 10
div.classList.toggle("visible", i < 10);

// false
console.log(div.classList.contains("foo"));

// add or remove multiple classes
div.classList.add("foo", "bar", "baz");
div.classList.remove("foo", "bar", "baz");

// add or remove multiple classes using spread syntax
const cls = ["foo", "bar"];
div.classList.add(...cls);
div.classList.remove(...cls);

// replace class "foo" with class "bar"
div.classList.replace("foo", "bar");
```

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}

## See also

- {{domxref("element.className")}}
- {{domxref("DOMTokenList")}}
- [`classList.js`](https://github.com/eligrey/classList.js) (a cross-browser JavaScript polyfill that fully implements `element.classList`)