1. @DomName('CharacterData.before')
  2. @DocsEditable()
  3. @Experimental()
void before(Object nodes)

Source 

@DomName('CharacterData.before')
@DocsEditable()
@Experimental() // untriaged
void before(Object nodes) =>
    _blink.BlinkCharacterData.instance.before_Callback_1_(this, nodes);