The class attribute

class assigns one or more classes to an element, used for styling in CSS and selection in JavaScript.

Applies to

global

Values

A space-separated list of class names, e.g. class="card featured".

Example

<div class="card featured">Content</div>

Edge cases

Unlike id, class doesn't need to be unique — many elements can share the same class.
The order of classes in the attribute doesn't affect CSS specificity.

Related tools

The id attribute

The global id attribute uniquely identifies an element within a document.

The style attribute

The global style attribute for inline CSS directly on an element.