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addClass

Platform and version requirements: JS (1.4)
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

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlinx.dom/add-class.html