<!DOCTYPE html> <!-- webkit-test-runner [ LayoutFormattingContextEnabled=true InlineFormattingContextIntegrationEnabled=false ] -->
<style>
body {
   margin: 10px;
}
table {
    border-spacing: 0px;
}

td {
    width: 20px;
    height: 20px;
    padding: 0px;
}

th {
    width: 20px;
    height: 20px;
    padding: 0px;
}

thead {
    outline: 10px solid green;
}

tbody {
    outline: 10px solid green;
}

tfoot {
    outline: 10px solid green;
}
</style>
<table>
<thead>
<tr><th></th><th></th></tr>
<tr><th></th><th></th></tr>
<tr><th></th><th></th></tr>
</thead>
<tbody>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
<tr><td></td><td></td></tr>
</tbody>
<tfoot>
<tr><th></th><th></th></tr>
<tr><th></th><th></th></tr>
<tr><th></th><th></th></tr>
</tfoot>
</table>
