title: Period in CSS, does it do anything?
body: <p>I'm dealing with someone else's code here and have come across something like this:</p>
  
  <pre><code>.selector {
   .background-position : 0px 2px;
  }</code></pre>
  
  <p>Does the period <strong>on the line background-position</strong> do anything or was that their way of commenting the line out? It doesn't seem to have an effect that I know of (using chrome inspector and firefox inspector) but I want to make sure. </p>
  
  <p>Thanks for any insight on this.</p>