What browsers support position: relative, position: absolute on tr, td?

Chrome, Safari, and IE all support this as expected; Firefox fails entirely.

by b9chris

HTML

<table>
<tbody>
<tr><td>Hi<span>Hi</span></td></tr>
</tbody>
</table>

CSS

body {
    font: 10pt Verdana;
}

table {
    width: 200px;
}

tr {
    background: #ccc;
}

td {
    position: relative;
}

td span{
    display: block;
    position: absolute;
    top: 0; right: 0;
}