ho già usato:

Type selectors
codice:
h1 { font-family: sans-serif }
Descendant selectors
codice:
h1 em { color: blue }
Class selectors
codice:
.pastoral { color: green }
ID selectors
codice:
h1#chapter1 { text-align: center }
The link pseudo-classes: :link and :visited
codice:
a:link { color: red }
The dynamic pseudo-classes: :hover, :active, and :focus
codice:
a:link    { color: red }    /* unvisited links */
a:visited { color: blue }   /* visited links   */
a:hover   { color: yellow } /* user hovers     */
a:active  { color: lime }   /* active links    */
The language pseudo-class: :lang
codice:
html:lang(fr-ca) { quotes: '« ' ' »' }
ma devo ancora imparare ad usarla bene...