Webmaster in a Nutshell, Second Edition

Advanced Table Tags

While it is easy to build a simple table quickly with the tags we have described, you may desire more advanced table control such as varying border styles, running headers and footers, and column-based layout. HTML 4.0 adds new tags to accomplish these tasks, which originally appeared as extensions for Internet Explorer 3.0. Although they are defined in the standard, the only browser that implements these tags currently is still Internet Explorer. When making a table with these tags, make sure your tables can still be accommodated on other browsers.

Table Section Tags

The three table section tags provide a way for you to break your table into logical sections: the header, body, and footer. You define the sections by placing the row tags <tr> within the <thead>, <tbody>, or <tfoot> tags. The usual attributes for controlling the placement of the contents can be used in these tags to set the alignment for the rows and cells they contain.

The main purpose for defining these sections is that when the table is printed or displayed in multiple sections, it will use consistent running headers and footers. Another benefit is that you can visibly delineate the sections by adjusting the size of the rules between them. Internet Explorer allows you to do this by supplying the rules attribute to the <table> tag with the values groups, rows, or all.

Column Grouping

Similar to the sectioning of tables by rows, you can also section tables by columns. You can define column groups ...