title: Degradation issues for HTML5 semantic tags (article, footer, header)
body: <p>How well do the new layout tags in HTML5 degrade? What are the hazards in using them? (I'm not talking about <code>&lt;video&gt;</code>--I've seen specific fallback code for it).</p>
  
  <p>Specifically, in the case of something like </p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;&lt;/head&gt;
  &lt;body&gt;
  &lt;header&gt;
  &lt;h1&gt;Talking Dogs&lt;/h1&gt;
  &lt;b&gt;&lt;p&gt;Humans aren't the only talkers!&lt;/p&gt;&lt;/b&gt;
  &lt;/header&gt;
  &lt;article&gt;
  &lt;p&gt;Ever encountered a talking dog? I have.&lt;/p&gt;
  &lt;p&gt;It all happened one day as I was walking down the street...&lt;/p&gt;
  &lt;/article&gt;
  &lt;footer&gt;
  © 2009 Woofer Dog Corporation
  &lt;/footer&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Would using <code>&lt;header&gt;</code>, <code>&lt;article&gt;</code>, or <code>&lt;footer&gt;</code> cause any browser problems? Do they degrade to <code>&lt;div&gt;</code> in unsupporting browsers automatically? Or if I include them, should I only include them for semantic meaning, and not for CSS styling or DOM scripting?</p>