gecko-dev/layout/reftests/box-shadow/tableboxshadow-trshadow.html

<table border="0" cellpadding="0" cellspacing="0" style="position: absolute; top: 30px; left: 30px; background-color: green;"><tr style="box-shadow: 3px 3px black;"><td style="width: 300px; height: 300px;">s</td><td style="width: 300px; height: 300px;">s</td></tr><tr><td style="width: 300px; height: 300px;">s</td><td>s</td></tr></table>