Definition and Usage
使用方法

Defines the attribute values for one or more columns in a table. You can only use this element inside a table or a colgroup.
为表格中的一个或多个列定义属性值。你只能在表格或colgroup里使用这个元素

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

In HTML the <col> tag has no end tag.
在HTML中<col>不需要结束标签

In XHTML the <col> tag must be properly closed.
在XHTML中<col>标签必须合理关闭

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Tips and Notes
提示与注意点

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

Tip: Use this element when you want to specify different attribute values to a column inside a colgroup. Without a col element a column will inherit all its attribute values from the colgroup.
提示：当你想要给在colgroup里的列指定不同的属性值时可以使用这个元素。当col元素不存在的时候列会继承所有来自colgroup里的属性。

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实例

代码	输出结果
This example shows a colgroup that has three columns of different widths: 这个实例展示了一个colgroup带有三个不同宽度的列： <table border="1"> <colgroup span="3"> <col width="20"></col> <col width="50"></col> <col width="80"></col> </colgroup> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> </table>	This example shows a colgroup that has three columns of different widths: 这个实例展示了一个colgroup带有三个不同宽度的列： 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	STF

标准属性

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

For a full description, go to Standard Attributes.
查看完整的描述

事件属性

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

For a full description, go to Event Attributes.
查看完整的描述

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