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> |
Try it yourself » |
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.
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.
Differences Between HTML and XHTML
NONE
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.
Optional Attributes
DTD indicates in which 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 |
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 |
More information about Standard Attributes.
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 |
More information about Event Attributes.
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