title: Duplicate javascript and css includes
body: <p>I have a question regarding the javascript includes and css includes. What happens if we included the same css or javascript files two times by different developers?</p>
  
  <p><a href="http://example.com/sample.css" rel="nofollow">http://example.com/sample.css</a></p>
  
  <p>and if the same file is included again..</p>
  
  <p><a href="http://example.com/sample.css" rel="nofollow">http://example.com/sample.css</a> </p>
  
  <p>I know the browser will cache and doesn't make a subsequent request, but what other performance issues can it cause?</p>