title: Line height with HTML5 doctype in IE9
body: <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;body&gt;
    &lt;span style="font-size:48px"&gt;abc&lt;br&gt;&lt;/span&gt;
    &lt;span style="font-size:6px"&gt;abc&lt;br&gt;abc&lt;/span&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Only when I use HTML5 doctype, IE9 puts additional margins around the lines. Adding <code>font-size:0</code> or <code>line-height:0</code> on <code>&lt;br&gt;</code> has no effect.</p>
  
  <p>How can I get rid of those margins?</p>