title: Why <h1> in <header>?
body: <p>I just finished the Code School's <a href="http://www.codeschool.com/courses/functional-html5-css3" rel="nofollow">Functional HTML5 &amp; CSS3</a> and I noticed several times they emphasized that the <code>&lt;header&gt;</code> element should contain <code>&lt;h1&gt;</code> heading (not <code>&lt;h2&gt;</code>, <code>&lt;h3&gt;</code> etc.) but they did not explain why. </p>
  
  <p>Why is that? What makes the <code>&lt;h1&gt;</code> so special that it is the one that we should include in <code>&lt;header&gt;</code>?</p>