.red { background-color : red }
ul > li:nth-last-child(odd) { background-color : green }
ol > li:nth-last-child(even) { background-color : green }
table.t1 tr:nth-last-child(-n+4) { background-color : green }
table.t2 td:nth-last-child(3n+1) { background-color : green }