title: Negative margins vs relative positioning
body: <p>I've come across many layout techniques involving negative margins, such as this <a href="http://www.alistapart.com/articles/negativemargins/" rel="nofollow noreferrer">classic</a> for sidebar positioning.  It seems like these techniques could just as easily be applied with relative positioning.</p>
  <p>So instead of this:</p>
  <pre><code>.sidebar {
      margin-left:-600px;
  }
  </code></pre>
  <p>One would do this:</p>
  <pre><code>.sidebar {
      position:relative;
      left:-600px;
  }
  </code></pre>
  <p>It seems like relative positioning might even be cleaner in the vertical direction,
  as top-margin manipulation may be affected by collapsing margin issues, etc.</p>
  <p>Is there any advantage to one over the other, or are they practically equivalent?</p>