title: Scroll to marker in ckeditor 5
body: <p>Is there a method to scroll the view to a marker?</p>
  
  <p>I just need a method to ensure that my marker is visible to the user.</p>
  
  <p>I did find the method scrollViewportToShowTarget (@ckeditor/ckeditor5-utils/src/dom/scroll) but I was unable to get it to work. I tried to use</p>
  
  <pre><code>scrollViewportToShowTarget( {
    target: marker.getRange(),
    viewportOffset: 20
  } );
  </code></pre>
  
  <p>But that just gave me a
  TypeError: "elementOrRange.ownerDocument is undefined"</p>