HTML < colgroup > Tag

Example

Two colgroup elements that specify different alignment and style for the three columns in the table (notice that the first colgroup element spans two columns):
<table width="100%" border="1">
  <colgroup span="2" align="left"></colgroup>
  <colgroup align="right" style="color:#0000FF;"></colgroup>
  <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>

Definition and Usage

The <colgroup> tag is used to group columns in a table for formatting.

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

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

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Browser Support

The <colgroup> tag is supported in all major browsers.

Note: Firefox, Chrome, and Safari only support the span and width attributes of the colgroup element.

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Differences Between HTML and XHTML

NONE

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Tips and Notes

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

Also have a look at the <col> tag.

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Optional Attributes

DTD indicates in which HTML 4.01/XHTML 1.0 DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.

Attribute	Value	Description	DTD
align	left right center justify char	Aligns the content in a column group	STF
char	character	Aligns the content in a column group to a character	STF
charoff	number	Sets the number of characters the content will be aligned from the character specified by the char attribute	STF
span	number	Specifies the number of columns a column group should span	STF
valign	top middle bottom baseline	Vertical aligns the content in a column group	STF
width	pixels % relative_length	Specifies the width of a column group	STF

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Standard Attributes

The <colgroup> tag supports the following standard attributes:

Attribute	Value	Description	DTD
class	classname	Specifies a classname for an element	STF
dir	rtl ltr	Specifies the text direction for the content in an element	STF
id	id	Specifies a unique id for an element	STF
lang	language_code	Specifies a language code for the content in an element	STF
style	style_definition	Specifies an inline style for an element	STF
title	text	Specifies extra information about an element	STF
xml:lang	language_code	Specifies a language code for the content in an element, in XHTML documents	STF

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Event Attributes

The <colgroup> tag supports the following event attributes:

Attribute	Value	Description	DTD
onclick	script	Script to be run on a mouse click	STF
ondblclick	script	Script to be run on a mouse double-click	STF
onmousedown	script	Script to be run when mouse button is pressed	STF
onmousemove	script	Script to be run when mouse pointer moves	STF
onmouseout	script	Script to be run when mouse pointer moves out of an element	STF
onmouseover	script	Script to be run when mouse pointer moves over an element	STF
onmouseup	script	Script to be run when mouse button is released	STF
onkeydown	script	Script to be run when a key is pressed	STF
onkeypress	script	Script to be run when a key is pressed and released	STF
onkeyup	script	Script to be run when a key is released	STF