title: A little confusion about SASS which is something comes along with HAML
body: <p>According to <a href="http://sass-lang.com/tutorial.html" rel="nofollow">this website</a>.  It said that sass will generate css file which is css3
  so,here is my concern,what if the browser is not compatible with css3 file.
  can I generate css2 file? </p>