HTML and CSS Reference
In-Depth Information
Name
colgroup
Synopsis
<colgroup> . . . </colgroup>
Defines a conceptual group of columns that form a structural division within a table. The
col-
group
element must appear after the
caption
element and before any row (
tr
) or row group
(
thead
,
tbody
,
tfoot
) elements with the
table
element.
A table may include more than one column group. The number of columns in a group is speci-
fied either by the value of the
span
attribute or by a tally of column (
col
) elements within the
group. Column groups may be useful in speeding table display (for example, the columns can
be displayed incrementally without waiting for the entire contents of the table) and provide a
system for display on nonvisual display agents such as speech- and Braille-based browsers.
Usage
Categories:
None
Permitted contexts:
As a child of a
table
element, after any
caption
elements and before any
thead
,
tbody
,
tfoot
, and
tr
elements.
Permitted content:
If it has a
span
attribute, then it is empty. If the
span
attribute is absent, then it should
contain one or more
col
elements.
Start/end tags:
The start tag is optional if it has
col
as its first child and it is not preceded by a
colgroup
start tag without an end tag. The end tag is optional if the
colgroup
is not immediately
followed by a space character or comment. (XHTML: Required/Required.)
