title: Why <hr class="hidden" />?
body: <p>I'm working on an inherited webpage. Specifically trying to implement a print.css (there wasn't any print.css up till now).</p>
  
  <p>The previous developer has put in ...</p>
  
  <pre><code>&lt;hr class="hidden" /&gt;
  </code></pre>
  
  <p><em>The CSS for this in the main css is (unsurprisingly):</em></p>
  
  <pre><code>.hidden {
    display: none; }
  </code></pre>
  
  <p>... at points which separate the major sections of the page. Wondering if anyone can say why this might be useful?</p>
  
  <p>There's no separate print.css though it's possible he intended to implement one and ran out of time. The page is nicely designed, so I am assuming the previous guy knows what he's doing. </p>