title: Class or ID on Body Tag
body: <p>I've been applying an ID to the body tag of my HTML documents lately <a href="http://www.smashingmagazine.com/2008/11/12/12-principles-for-keeping-your-code-clean/">to allow greater CSS control (#9)</a>. Recently the though occurred to me that I could do exactly the same thing by applying a class to the body tag. I want to know positives and negatives of each choice. If I have multiple pages where the body tag has the same ID, is it better to use a class? What do you think? Why?</p>
  
  <p>UPDATE: The class/ID is basically what I intend to use to identify to the stylesheet which page or type of page the stylesheet is being applied to. For example, is it the homepage, the contact page, one of many search results pages, an archive page, etc?</p>