title: margin-top not working with clear: both
body: <p><div class="snippet" data-lang="js" data-hide="false">
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div style="float: left;"&gt;Left&lt;/div&gt;
  &lt;div style="float: right;"&gt;Right&lt;/div&gt;
  &lt;div style="clear: both; margin-top: 200px;"&gt;Main Data&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Why is the <code>margin:top</code> for 'Main Data' not working in the code above?</p>