title: How to go to an HTML anchor programatically in shiny?
body: <p>I can add a link to an anchor in the ui with <code>a("Go to Results", href = '#anchor_box')</code> and have the user to click on it to go to this anchor.</p>
  
  <p>But how to have the window 'sent to' <code>#anchor_box</code> programatically? For example when results are available at the end of an <code>observeEvent()</code> with a long running time? </p>