title: What are the most common CSS property prefixes?
body: <p>I've been reading many articles and I've seen prefixes such as <code>-webkit-</code>, <code>-moz-</code>, <code>-ms-</code>, <code>-o-</code>. Obviously the first two are commonly used and are also specified in W3C, however what about the latter ? Are they real, and if so, should I be worried about using them ?</p>
  
  <p>Most of the websites only specify the need to use <code>-webkit-</code> and <code>-moz-</code> on specific properties which I'm aware of, however I am aiming to have my code cover the largest range of browsers possible therefore I need to know if the above prefixes and their inexistence can affect my cross-browser compatibility.</p>
  
  <p>Thank you!</p>