css nth child and after element code example

Example 1: select first 5 child css

li:nth-child(-n+5) {
    color: green;   
}

Example 2: how select two nt child with css

//Separate the classes with a comma ,

.ListTaskTime tbody tr >td:nth-child(3), 
.ListTaskTime tbody tr >td:nth-child(6),
.ListTaskTime tbody tr >td:nth-child(9) {
    /* Common Styles Goes Here, Styles will apply to child 3,6 and 9 */
}