td:empty background: gray;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title> My favorite records </title>
<style>
table {
width: 100%;
border: thin solid black;
}
td:empty {
background: gray;
}
th, tfoot td {
border: thin solid black;
text-align: center;
font-weight: bold;
}
tbody td {
font-size: 120%;
}
caption {
font-size: 90%;
text-align: right;
}
td, th, caption {
padding: 5px;
}
</style>
</head>
<body>
<table>
<caption>
Table: My favorite records.
</caption>
<colgroup>
<col id='album' />
<col id='artist' />
<col id='released' />
</colgroup>
<thead>
<tr>
<th> album </th>
<th> artist </th>
<th> released </th>
</tr>
</thead>
<tbody>
<tr>
<td> This is a test. </td>
<td> This is a test. </td>
<td> 1965 </td>
</tr>
<tr>
<td> This is a test. </td>
<td> This is a test. </td>
<td> 1967 </td>
</tr>
<tr>
<td> Queen II </td>
<td> Queen </td>
<td> 1974 </td>
</tr>
<tr>
<td> Sone </td>
<td> Music </td>
<td> 1995 </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
<tfoot>
<tr>
<td> album </td>
<td> artist </td>
<td> released </td>
</tr>
</tfoot>
</table>
</body>
</html>
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