customClassList

A property that represents an element's custom CSS classes.

You can use this property to manipulate the custom CSS classes of an element. For example, you can add a custom class to an element or replace an existing class with a new custom class.

Custom classes are those that you create on a site, not the predefined global classes that are provided for each element.

Use the following methods to work with the element's custom CSS classes:

• add(): Adds custom CSS classes to the class list of an element.
• contains(): Indicates whether the element's class list contains a specified custom CSS class.
• remove(): Removes custom CSS classes from an element's class list.
• replace(): Replaces a custom CSS class of an element with a different custom CSS class.
• toggle(): Toggles an element's custom CSS class.
• values(): Retrieves an array of strings listing an element's custom CSS classes.