firefox/layout/reftests/box-shadow/tableboxshadow-tdshadow.html

<table border="0" cellpadding="0" cellspacing="20" style="position: absolute; top: 30px; left: 30px;"><tr><td style="background-color: green; box-shadow: 6px 6px rgba(0, 0, 0, 0.4); width: 300px; height: 300px;">s</td><td style="background-color: green; box-shadow: 6px 6px rgba(0, 0, 0, 0.4); width: 300px; height: 300px;">s</td></tr></table>