HTML and CSS Reference
align This attribute specifies horizontal alignment of the contents of the cells in the column
group. The values of center , left , and right have obvious meanings. A value of justify
for the attribute attempts to justify all the column's contents. A value of char attempts to
align the contents based on the value of the char attribute in conjunction with charoff .
bgcolor This Internet Explorer-specific attribute sets the background color for the columns
in the column group. Its value can be either a browser-dependent named color or a color
specified using the hexadecimal #RRGGBB format.
char This attribute is used to set the character on which the cells in a column should be
aligned. A typical value for this attribute is a period ( . ) for aligning numbers or monetary
charoff This attribute is used to indicate the number of characters by which the column
data should be offset from the alignment characters specified by the char value.
span When present, this attribute specifies the default number of columns in this group.
Browsers should ignore this attribute if the current column group contains one or more
<col> tags. The default value of this attribute is 1 .
valign This attribute specifies the vertical alignment of the contents of the cells within the
width This attribute specifies a default width for each column and its cells in the current
column group. In addition to the standard pixel and percentage values, this attribute can
take the special form 0* , which means that the width of each column in the group should be
the minimum width necessary to hold the column's contents.
<colgroup span="2" align="char" char=":" valign="center">
<col /><col /><col />
<colgroup style="background-color: green;">
<col align="left" />
<col align="center" />
HTML 4, 4.01, 5
XHTML 1.0, 1.1
Firefox 1+, Internet Explorer 4+,
Netscape 6+, Opera 7+, Safari 1+
• Each column group defined by a <colgroup> tag can contain zero or more <col>
• Under XHTML 1.0, the closing </colgroup> tag is mandatory.