td.Zs span {background: #EEE}
td.Co {background: #A99} /* private */
+/* alternate categories */
+td.Ascii {background: #EFD} /* ascii */
+td.Di {background: #FFD} /* rfc-1345 digraph */
+td.DiProp {background: #FED} /* proposed digraph */
+td.DiNone {background: #FDD} /* other unicode */
+td.Reserved {background: #BBB} /* impossible */
+
/* hover effects */
td.X:hover {cursor: help}
td.Greek:hover {background: #FA9}