add

The add JS DOMTokenList adds all arguments passed, except those already present.

Throws a "SyntaxError" DOMException if one of the arguments is the empty string.

Throws an "InvalidCharacterError" DOMException if one of the arguments contains any ASCII whitespace.

tokenlist.add(tokens…)

A list of strings.

contains

item

length

remove

replace

supports

toggle

value

Web Hypertext Application Technology Working Group (WHATWG)