title: What is auto outline in Webkit?
body: <p>What does <code>auto</code> mean when I write:</p>
  
  <pre><code>:focus {
      outline: auto 5px -webkit-focus-ring-color
  }
  </code></pre>
  
  <p>It is not documented <a href="http://www.w3schools.com/css/css_outline.asp">here</a> and I cannot find documentation elsewhere.</p>