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Column group

This element is used to group together a set of columns within a table as one group so that shared attributes can be set to all grouped columns.

    align="center | char | justify | left | right"
    class="class name(s)"
    dir="ltr | rtl"
    id="unique identifier"
    lang="language code"
    style="style information"
    valign="baseline | bottom | middle | top"
    width="pixels | %"

‡ = Required attribute
** = Transitional only

Explanation of attributes

align: used to specify the horizontal alignment of the cells within the column. The value "char" aligns the contents according the value set in the char attribute.

char: used to set the character to which the cells in the column are aligned. This is quite often used when trying to align columns of cells containing monetary figures, where the value of this attribute is set to the period (.) character and the values in the column all line up at the period.

charoff: used to offset the column data from the alignment character stipulated in the char attribute. The value of this attribute represents the number of characters to offset by.

class: used to state which class(es) the element belongs to. It is possible to indicate more than one class for an element by separating each class name with a space character. This attribute is normally used in combination with a stylesheet in order to associate the elements with particular styles defined within the stylesheet.

dir: used to set the direction of the text in combination with the language set in the lang attribute. The available values are "ltr" (left to right) and "rtl" (right to left), with the default value being "ltr".

id: used to specify a unique alphanumeric identifier to the element. This is usually used in combination with stylesheets in order to apply a style to one particular instance of an element. Only one element, regardless of type, can be given a particular id.

lang: used to indicate the language being used in the text contained within the element. The value of this attribute takes on the form of the ISO standard lanuage abbreviations found in RFC 3066. A list of these codes can be found on the ISO language codes page.

span: used to state that a column's properties should span the set number of consecutive columns.

style: used to specify an inline style to apply to the element. The styles defined here override the styles declared in the header section.

title: used to define an advisory text that may be displayed as a tooltip when a mouse is used to hover over the element.

valign: used to specify the vertical alignment of text within the cells. The default value of this attribute is "middle".

width: used to define the width of the cell. This is generally set as a pixel value or as a percentage.

Event handlers

The following event handlers are defined for this element:

Basic example

  <colgroup style="background: #cccccc;">
    <col align="center" width="50%"><col align="right">

The above code will display something like:

Centered Right


Description: Support of column group and attributes in various browsers
Test Internet Explorer 6+ Netscape 4 Mozilla and Netscape 6+ Opera 6+ MSN TV (WebTV) Konqeuror 3.0+
Basic element support  Yes  Yes  Yes  Yes 
Attribute: align  Yes  No  No  Yes  No 
Attribute: char  No  No  No  No  No  No 
Attribute: charoffset  No  No  No  No  No  No 
Attribute: class  Yes  No  No  Yes  No  Yes 
Attribute: dir  Yes  No  No  No  No  No 
Attribute: id  Yes  No  No  Yes  No  Yes 
Attribute: lang  Yes  No  No  No  No  No 
Attribute: span  Yes  No  No  Yes 
Attribute: style  Yes  No  No  Yes  No  Yes 
Attribute: title  No  No  No  No  No  No 
Attribute: valign  Yes  No  No  Yes  No 
Attribute: width  Yes  Yes  Yes 

The browser icons are explained in the below list:
Internet Explorer 6+ = Microsoft Internet Explorer 6+
Netscape 4 = Netscape Communicator 4
Mozilla and Netscape 6+ = Mozilla and Netscape Navigator 6+
Opera 7+ = Opera 7+
MSN TV (WebTV) = MSN TV (aka. WebTV)
Konqeuror 3.0+ = Konqueror 3.0+