From http://www.w3schools.com (Copyright Refsnes Data)

HTML <col> tag

Example

col elements that specify different alignment for the three columns in the table:

<table width="100%" border="1">
<col align="left"></col>
<col align="left"></col>
<col align="right"></col>
<tr>
    <th>ISBN</th>
    <th>Title</th>
    <th>Price</th>
</tr>
<tr>
    <td>3476896</td>
    <td>My first HTML</td>
    <td>$53</td>
</tr>
</table>

Try it yourself!

Definition and Usage

The <col> tag defines attribute values for one or more columns in a table.

The <col> tag is useful for applying styles to entire columns, instead of repeating the styles for each cell, for each row.

The <col> tag can only be used inside a table or a colgroup element.

Browser Support

The <col> tag is only supported by Internet Explorer and Opera.

Differences Between HTML and XHTML

In HTML the <col> tag has no end tag.

In XHTML the <col> tag must be properly closed.

Tips and Notes

Tips: Add the class attribute to the <col> tag, and let CSS take care of alignment, widths, colors, etc.!

Also have a look at the <colgroup> tag.

Optional Attributes

DTD indicates in which DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.

Attribute	Value	Description	DTD
align	right left center justify char	Defines the horizontal alignment of the content in the table cell, in the column	STF
char	character	Defines a character to use to align text on (use with align="char")	STF
charoff	character-offset	Defines an alignment offset to the first character to align on, as set with char	STF
span	number	Defines the number of columns the <col> should span	STF
valign	top middle bottom baseline	Defines the vertical alignment of the content in the table cell, in the column	STF
width	% pixels relative_length	Defines the width of the column. Note: Overrides the width set in <colgroup>	STF

Standard Attributes

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

For a full description, go to Standard Attributes.

Event Attributes

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

For a full description, go to Event Attributes.