Link
Links can be styled differently depending on what state they are in.
CSS超鏈接除了可以設定基本的性質，如：顏色、背景色，還可以根據他們所處的狀態來樣式化。
四種鏈接狀態分別是:
- a:link - a normal, unvisited link 還沒有訪問
- a:visited - a link the user has visited
- a:hover - a link when the user mouses over it 鼠標劃過
- a:active - a link the moment it is clicked 鼠標點擊
order rules: 需遵守的順序規則
- a:hover MUST come after a:link and a:visited
- a:active MUST come after a:hover
Table
Table Border
Note: Both the <table> and the <th> / <td> elements have separate borders.
給表格設置邊框的時候，注意表格和單元格都有獨立的邊框。
The border-collapse property sets whether the table borders are collapsed into a single border or separated.
該性質指定是否合併表格和單元格的邊框。合併，如下例：
table
{
border-collapse:collapse;
}
table, td, th
{
border:1px solid black;
}Table Text Alignment
The text-align property sets the horizontal alignment, like left, right, or center
該性質設定表格中文本的水平對齊方式。
By default, the text in <th> elements are center-aligned and the text in <td> elements are left-aligned.
默認地，表頭元素是中心對齊，單元格里的元素爲左對齊。
The vertical-align property sets the vertical alignment, like top, bottom, or middle
該性質設定表格中文本的垂直對齊方式。
By default, the vertical alignment of text in a table is middle (for both <th> and <td> elements).
默認地，表格中文本是垂直居中對齊。
Table Padding
使用padding在 和 元素上設定單元格里內邊距。
Caption Side
Specify the placement of a table caption，指定表格標題的位置。
取值：
- top 默認值，在表格上方，水平居中
- bottom
Note:IE8 supports the caption-side property only if a !DOCTYPE is specified.