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
§26.2.1.1 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
