Did you want something like this, an empty cell before ‘E’ cell I have added an empty <td></td> before it and to maintain table structure as demanded added empty <th></th> as well.
table,th,td {
border: 1px solid black;
border-collapse: collapse;
}
th {width: 50px; padding-top: 6px;}
td {text-align: center;} <body>
<table>
<thead>
<tr>
<th colspan="5" style="width: 300px; height: 60px; background-color: gold;"> ABC</th>
</tr>
</thead>
<tbody>
<tr>
<th></th>
<th>A</th>
<th>B</th>
<th>C</th>
<th>D</th>
</tr>
<tr>
<td></td>
<td>E</td>
<td>F</td>
<td>G</td>
<td>H</td>
</tr>
</table>
</body>