CSS3 and the nth child

Numeric values

	ol.nth-num li:nth-child(1), ol.nth-num li:nth-child(5) {
		background-color: #cccccc;
	}
	

1. item 1
2. item 2
3. item 3
4. item 4
5. item 5
6. item 6

Alternating elements

	ol.nth-alt li:nth-child(odd) {
		background-color: #cccccc;
	}
	
	ol.nth-alt li:nth-child(even) {
		background-color: #eeeeee;
	}
	
	

1. item 1
2. item 2
3. item 3
4. item 4
5. item 5
6. item 6

Formula based values

	ol.nth-for1 li:nth-child(3n+0) {
		background-color: #cccccc;
	}
	

1. item 1
2. item 2
3. item 3
4. item 4
5. item 5
6. item 6

	ol.nth-for2 li:nth-child(3n+5) {
		background-color: #cccccc;
	}
	

1. item 1
2. item 2
3. item 3
4. item 4
5. item 5
6. item 6
7. item 7
8. item 8
9. item 9
10. item 10
11. item 11
12. item 12