title: IONIC 4 add css attributes to ionic components
body: <p>Does anyone know how to place an icon in a toggle? 
  Is this even possible with the new shadow dom rules?</p>
  
  <p><a href="https://beta.ionicframework.com/docs/api/toggle/" rel="nofollow noreferrer">https://beta.ionicframework.com/docs/api/toggle/</a></p>
  
  <p>I have tried placing a icon element in the toggle but no succes.</p>
  
  <p>Thanks,
  Kelvijn</p>