title: outline: none VS outline: 0
body: <p>I was reading <a href="https://stackoverflow.com/q/13195081/5620297">this question</a> on disabling the dashed borders around <code>&lt;a&gt;</code> links. <a href="https://stackoverflow.com/a/13195091/5620297">Some</a> <a href="https://stackoverflow.com/a/13195231/5620297">answers</a> used <code>outline: none</code>, while <a href="https://stackoverflow.com/a/13195127/5620297">some</a> used <code>outline: 0</code></p>
  
  <p>Is there any difference between using <code>outline: none</code> and <code>outline: 0</code>?</p>