Paper is an inline window.

It provides a header with a title and controls and it provides a body.

<x-paper
  id="paper-1"
  title="Paper 1"
  show-controls="true"
  on-close="">
  <div>
    Paper is an inline window.<br/> <br/>
    It provides a header with a title and
    controls and it provides a body.
  </div>
</x-paper>