showWhen platform in normal ionic serve


I have the following in a modal template:

  <button ion-button (click)="cancel()">
        <span ion-text color="primary" showWhen="ios">Cancel</span>
        <ion-icon name="md-close" showWhen="android,windows"></ion-icon>

When running in ionic serve --lab it works as expected. However in normal ionic serve I won’t see any of these buttons. Which also makes sense, but I was wondering what the “platform” spec should be so that it appears in that context too?