Rounded table corners CSS only

Seems to work fine in FF and Chrome (haven't tested any others) with separate borders: http://jsfiddle.net/7veZQ/3/

Edit: Here's a relatively clean implementation of your sketch:

table {
    border-collapse:separate;
    border:solid black 1px;
    border-radius:6px;
}

td, th {
    border-left:solid black 1px;
    border-top:solid black 1px;
}

th {
    background-color: blue;
    border-top: none;
}

td:first-child, th:first-child {
     border-left: none;
}
<table>
    <thead>
    <tr>
        <th>blah</th>
        <th>fwee</th>
        <th>spoon</th>
    </tr>
    </thead>
    <tr>
        <td>blah</td>
        <td>fwee</td>
        <td>spoon</td>
    </tr>
    <tr>
        <td>blah</td>
        <td>fwee</td>
        <td>spoon</td>
    </tr>
</table>

http://jsfiddle.net/MuZzz/3577/


For me, the Twitter Bootstrap Solution looks good. It excludes IE < 9 (no round corners in IE 8 and lower), but that's O.K. I think, if you develop prospective Web-Apps.

CSS/HTML:

table { 
    border: 1px solid #ddd;
    border-collapse: separate;
    border-left: 0;
    border-radius: 4px;
    border-spacing: 0px;
}
thead {
    display: table-header-group;
    vertical-align: middle;
    border-color: inherit;
    border-collapse: separate;
}
tr {
    display: table-row;
    vertical-align: inherit;
    border-color: inherit;
}
th, td {
    padding: 5px 4px 6px 4px; 
    text-align: left;
    vertical-align: top;
    border-left: 1px solid #ddd;    
}
td {
    border-top: 1px solid #ddd;    
}
thead:first-child tr:first-child th:first-child, tbody:first-child tr:first-child td:first-child {
    border-radius: 4px 0 0 0;
}
thead:last-child tr:last-child th:first-child, tbody:last-child tr:last-child td:first-child {
    border-radius: 0 0 0 4px;
}
<table>
  <thead>
    <tr><th>xxx</th><th>xxx</th><th>xxx</th></tr>
  </thead>
  <tbody>
    <tr><td>xxx</td><td>xxx</td><td>xxx</td></tr>
    <tr><td>xxx</td><td>xxx</td><td>xxx</td></tr>
    <tr><td>xxx</td><td>xxx</td><td>xxx</td></tr>
    <tr><td>xxx</td><td>xxx</td><td>xxx</td></tr>
    <tr><td>xxx</td><td>xxx</td><td>xxx</td></tr>
  </tbody>
</table>

You can play with that here (on jsFiddle)