HTML and CSS Reference
In-Depth Information
Explorer through table extensions, help you turn the tables and think in
Unlike the sectioning tags described in the previous sections, which are
interspersed with the rows of a table to define headers, footers, and sec-
tions within the table, the column-related tags cannot be intermingled
with the content of a table. You must place them at the very beginning
of a table, before the content. They define the model by which HTML
4/XHTML-compliant browsers render the columns.
10.3.7. The <colgroup> Tag
The <colgroup> tag defines a column group. You can use the <colgroup>
tag in two ways: as a single definition of several identical columns, or
as a container for several dissimilar columns. You can put one or more
<colgroup> tags within a <table> tag. The ending </colgroup> tag is rarely
used in HTML but is required in XHTML. In HTML, the <colgroup> ends at
the next <colgroup>, <thead>, <tbody>, <tfoot> , or <tr> tag.
All the currently popular browsers support <colgroup> and its attributes. The span attribute
Use the span attribute with the <colgroup> tag to achieve the first type of
column grouping. The value of the span attribute is the integer number
of columns affected by the <colgroup> tag. For example, a table with six
columnsfour in the first group and two in the otherwould appear in the
source code as:
<colgroup span="4">
<colgroup span="2">
When the HTML 4/XHTML-compliant browser collects the table cells into
columns by the example definition, it groups the first four cells in each
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