title: What does a pipe (|) do in a CSS selector?
body: <p>I found the following definition in a CSS stylesheet : </p>
  
  <pre><code>*|*:link {color:#ff00ff;}
  </code></pre>
  
  <p>What's the use of the <strong><em>|</em></strong>? Is it some sort of CSS Hack?</p>