What's incorrect in this table row code with table headers?
<tr><th colspan:"2">Header</th></tr>
<tr> should be inside <thead>
<tr>
<thead>
Header should be inside a <p> tag
Header
<p>
<th> should be <td>
<th>
<td>
colspan:"2" should be colspan="2"
colspan:"2"
colspan="2"