15 用户界面样式
color
cursor
font
outline
outline-color
outline-style
outline-width
scrollbar-3dlight-color
scrollbar-arrow-color
scrollbar-base-color
scrollbar-darkshadow-color
scrollbar-face-color
scrollbar-highlight-color
scrollbar-shadow-color
scrollbar-track-color
5 CSS选择器
a:active
a:focus
a:hover
a:link
a:visited
after
before
element
element#idname
element.classname
element1.element2
element1:[att|="val"]
element1[attr$="substring"]
element1[attr*="substring"]
element1[attr]
element1[attr^="substring"]
element1[attr～="value"]
element1[attr="value"]
element1+element2
element1＞element2
first-child
first-letter
first-line
lang
