Inferrable roles inside grid

When an HTML <table> is declared as role=grid, why do <tr>s have to be  
declared as role=row?

Also, when the table acts as a grid, are all cells gridcells or are  
some not? Why is this distinguished by role instead of tabindex, if  
the salient difference of a gridcell compared to a table cell is  

Henri Sivonen

Received on Monday, 24 March 2008 13:08:03 UTC