title: What is the difference between positive and negative flexibility in css
body: <p>I was reading about the box-flex documentation for IE <a href="http://msdn.microsoft.com/en-us/library/ie/hh673531%28v=vs.85%29.aspx" rel="nofollow">here</a> and I noticed the use of 'positive' and 'negative' flexibility.</p>
  
  <p>Can anyone explain what these terms mean and how they differ?</p>
  
  <p>Thanks!</p>