title: css 1, css 2, css 2.1 and css 3 , which css properties and selectors are different/new in each version?
body: <p>CSS 1, CSS 2,  CSS 2.1 and CSS 3: which CSS properties and selectors are different in each version? I searched google a lot, but haven't found any list?</p>
  
  <p>I need a list of the properties and selectors supported for each version with differences.</p>