HTML & XHTML Pocket Reference, 4th Edition

Name

colgroup — HTML 4.01 | HTML5

Synopsis

<colgroup> . . . </colgroup>

Defines a conceptual group of columns that form a structural division within a table. The colgroup 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 specified 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.

Start/End Tags

HTML 4.01: Required/Optional; HTML5: Optional/Optional; XHTML: Required/Required

Attributes

Same attributes as col element.

Example

See also table.

<table>
<colgroup id="employinfo">
   <col span="2" width="100" />
   <col span="1" width="50" class="date" />
</colgroup>
<thead> . . .  (markup continues)