26.2.1 Specifying group properties for header cells
§26.2.1.1 Defining blocks of header cells
§26.2.1.2 Using header cells to define column groups
§26.2.1.3 Using header cells to define row groups
> 26 Identifying HTML table structure for WAI > 26.2 Associating table cells with header cells > 26.2.1 Specifying group properties for header cells