Combining fixed and variable width columns in one table

Question

How can I create a table with CSS like the following (the first three columns with a fixed width in px and the following columns with a width in %):

I know how I can create a column with variable or fixed width.

Answer 1

Nest another table for the 4 columns on the right. The HTML structure would look like:

<table class = "big first">
<tr>
<td class = "px10">Cell1</td>
<td class = "px20">Cell2</td>
<td class = "px30">Cell3</td>
<td>
    <table class = "big">
    <td>1</td><td>2</td><td>3</td><td>4</td>
    </table>
</td>
</tr>
</table>

CSS:

.big {
    width: 100%;
}
.first {
    table-layout: fixed;
}
.big, .big td {
    border: 1px sold black;
}
.big td {
    background: rgb(0, 162, 232);
}
.big .px10 {
    background: orange;
    width: 10px;
}
.big .px20 {
    background: green;
    width: 20px;
}
.big .px30 {
    background: yellow;
    width: 30px;
}

And a little demo: little link.

Edit: it turns out there might be no need for another table: another little link.