td.Xi, td.Cs {background: #CCC} /* invalid */
td.Xd {color: #844} /* deprecated */
td.Xr {color: #888} /* reserved (digraph reverse or proposal) */
td.Xi, td.Cs {background: #CCC} /* invalid */
td.Xd {color: #844} /* deprecated */
td.Xr {color: #888} /* reserved (digraph reverse or proposal) */