Q98408 の回答

HTMLとCSSは、こんな感じ。

<style>
#Q98408 {
    border-collapse: collapse;
    empty-cells: show;
}
#Q98408 tr {
    height: 4em;
}
#Q98408 td {
    width: 4em;
    border: 2px solid black;
}
</style>
<table id="Q98408" border="2">
<tr>
    <td colspan="2"></td>
    <td></td>
    <td></td>
    <td colspan="2"></td>
    <td rowspan="2"></td>
</tr>
<tr>
    <td rowspan="2"></td>
    <td rowspan="2"></td>
    <td></td>
    <td></td>
    <td></td>
    <td rowspan="2"></td>
</tr>
<tr>
    <td></td>
    <td></td>
    <td></td>
    <td rowspan="3"></td>
</tr>
<tr>
    <td colspan="2" rowspan="3"></td>
    <td></td>
    <td rowspan="2"></td>
    <td rowspan="2"></td>
    <td rowspan="2"></td>
</tr>
<tr>
    <td rowspan="2"></td>
</tr>
<tr>
    <td colspan="2"></td>
    <td colspan="2" rowspan="2"></td>
</tr>
<tr>
    <td colspan="2"></td>
    <td colspan="3"></td>
</tr>
</table>