title: Waiting function for CSS element in Capybara
body: <p>There are waiting and non-waiting functions in Capybara. I am trying to use the first as much as possible. </p>
  
  <p>Is there a way to use <code>find</code> (or one of its derivatives) to look for a CSS element that appears asynchronously?
  Unfortunately, function <code>page.has_css?</code> is a non-waiting function.</p>