1. @DomName('WorkerGlobalScope.atob')
  2. @DocsEditable()
  3. @Experimental()
String atob(String atob)

Source 

@DomName('WorkerGlobalScope.atob')
@DocsEditable()
@Experimental() // untriaged
String atob(String atob) =>
    _blink.BlinkWorkerGlobalScope.instance.atob_Callback_1_(this, atob);