All CSS Pseudo Classes/Elements
Selector    Example Example description
:link   a:link  Selects all unvisited links
:visited    a:visited   Selects all visited links
:active a:active    Selects the active link
:hover  a:hover Selects links on mouse over
:focus  input:focus Selects the input element which has focus
::first-letter  p::first-letter Selects the first letter of every <p> element
::first-line    p::first-line   Selects the first line of every <p> element
:first-child    p:first-child   Selects every <p> elements that is the first child of its parent
::before    p::before   Insert content before every <p> element
::after p::after    Insert content after every <p> element
:lang(language) p:lang(it)  Selects every <p> element with a lang attribute value starting with "it"