Sean you can use the <td>
tag for styling your various widths, correct, but I don't see any issues with the code you are using now, provided the <colgroup>
designation is placed in the proper placement relative to the <table>
tag as follows:
<table style="border:1px solid #000; table-layout:fixed;">
<colgroup>
<col style="width: 25%;" />
<col style="width: 65%;" />
<col style="width: 10%;" />
</colgroup>
<tr>
<th>ISBN</th>
<th>Title</th>
<th>Price</th>
</tr>
<tr>
<td>3476896</td>
<td>My first HTML</td>
<td>$53</td>
</tr>
<tr>
<td>5869207</td>
<td>My first CSS</td>
<td>$49</td>
</tr>
</table>
IE 8 apparently doesn't play nicely with jsfiddle, so I dumped the code into one of those W3C sandboxes to test. Just go to that link in IE 8 and replace their colgroup section with what I have above, and hit the "submit code" button to view results.