title: Choosing a background image via CSS, what are the differences?
body: <p>I'm playing around with some CSS and so far all of these seem to do the same:</p>
  
  <pre><code>background: url('/images/file.png');
  background: image-url('file.png'); /* Doesn't requires as much info about the path. */
  background-image: url('/images/file.png');
  </code></pre>
  
  <p>Is there a difference or is it just up to preference?</p>