a:link
a:visited
a:hover
a:active
a:focus
li:first-child
li:last-child
li:nth-child(even)
li:nth-child(odd)
li:nth-child(3)
li:nth-last-child(10)
li:nth-child(3n+2) start at 2, go up by 3 from there, eg, 2, 5, 8 ...
article:only-child
p::first-letter
p::first-line
div p every p beneath a div
div > p only immediate direct children only p elements that are immediate direct children of a div
div ~ p all siblings following any p that is a sibling following a div
div + p immediate sibling following any single p immediately following a div that is a sibling to the div