 id and headers attributes. All cells reference top level header 'Exams' (id="e") - this isn't correct for the last three columns which should reference header 'Projects'. Also, the referencing of the second level column headers has been accidentally swapped even though in this example this makes no difference as the contents (1, 2, Final) are repeated.
							</p>
            <p>Example Code:</p>
            <pre xml:space="preserve">
&lt;table&gt;
   &lt;tr&gt;
     &lt;th rowspan="2" id="h"&gt;Homework&l