addClass
fun Element.addClass(vararg cssClasses: String): Boolean
Adds CSS class to element. Has no effect if all specified classes are already in class attribute of the element
Return true if at least one class has been added
fun Element.addClass(vararg cssClasses: String): Boolean
Adds CSS class to element. Has no effect if all specified classes are already in class attribute of the element
Return true if at least one class has been added