元素选择符Element Selectors
*
E
#id
.class
.class.class
关系选择符Relationship Selectors
E F
E > F
E + F
E ~ F
属性选择符Attribute Selectors
[att]
[att="val"]
[att^="val"]
[att$="val"]
[att*="val"]
[att~="val"]
[att|="val"]
伪对象选择符Pseudo-Element Selectors
:first-letter
::first-letter
:first-line
::first-line
:before
::before
:after
::after
::selection