.css3selectors th, .explain {background-color:#FFFF66; padding:4px; } .css3selectors td {padding:4px;} .css3selectors td.compliant {background-color:#009900;} .css3selectors td.iffy {background-color:#FF9900;} .css3selectors td.noncompliant {background-color:#FF0000;} Update 6/30/09: Firefox 3.5 was