Definition and Usage
使用方法

Defines groups of table columns. With this element, you can group columns for formatting. This element is only valid inside the <table> tag.
定义表格列组。使用这个元素可以格式化列组。这个元素只在<table>标签中使用才有效。

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Differences Between HTML and XHTML
它在HTML和XHTML中的区别

NONE
无

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Tips and Notes
提示与注意点

Note: The colgroup element is an empty element that contains attributes only. To create columns, you must specify td elements within a tr element.
注意：colgroup元素为空元素，只包含属性。你必须在tr元素里指定td元素才能建立列。

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实例

This example creates a table with four columns, with the first three columns in one colgroup, and the last column in the second colgroup:
该例将建立一个带有四个列的表格。前三个列将并在一个colgroup中，剩下的一个在第二个colgroup:

代码	输出结果
<table border="1"> <colgroup span="3" style="color:#FF0000;"> </colgroup> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> </table>	1 2 3 4

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可选属性

DTD indicates in which DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
下表中的DTD列指明了被支持的DTD属性。S=Strict（精确的），T=Transitional（传统的），F=Frameset（框架）

属性名	值	描述	DTD
align	right left center justify char	Defines the horizontal alignment of the content in the table cell, in the column 定义表格单元内或是列内文字的的水平对齐方向	STF
char	character	Defines a character to use to align text on (use with align="char") 向某字对齐(得同时用上align="char")	STF
charoff	pixels %	Defines an alignment offset to the first character to align on, as set with char 取消向某字对齐	STF
span	number	Defines the number of columns the <col> should span 定义所要跨度列的数量	STF
valign	top middle bottom baseline	Defines the vertical alignment of the content in the table cell, in the column 定义表格单元内或是列内文字的垂直对齐	STF
width	% pixels relative_length	Defines the width of the column. 定义列的宽度 Note: Overrides the width set in <colgroup> 注意：优先级高于在<colgroup>里的设置

标准属性

id, class, title, style, dir, lang, xml:lang

For a full description, go to Standard Attributes.
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事件属性

onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup

For a full description, go to Event Attributes.
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