title: What is the minimal css for a navigation bar
body: <p>With the advent of the 'nav' tag I'm revisiting the creation of a navigation bar. There are many tutorials but they take different approaches and cloud the issue with too much css.</p>
  
  <p>Specifically, I have a 960 width content area and I want to centre the nav buttons within this.</p>
  
  <ol>
  <li>Does the 'nav' element have any inherent css-behaviour, or is it purely a semantic-container?</li>
  <li>If I'm centre-ing the buttons then surely I don't need to 'float' them? Text-align, centre for the ul should do the trick.</li>
  <li>If I want the buttons to be shorter than the nav-bar itself, should I give the bar a height (using line-height for the buttons to centre them) or add margins to the buttons to push the bar outwards (vertically)?</li>
  </ol>