title: Refresh tokens without an iframe
body: <p>I have an app working using the oidc-client-js. The silent refresh works great. Problem is that the refresh is using an iframe and our IT department have decided iframes are bad and have disabled them on their new network they are rolling out!</p>
  
  <p>Is there a way to refresh the token without an iframe or doing a whole redirect back to the id server to get a new token.</p>
  
  <p>Thanks</p>