In case of tables, gnopernicus should have the behaviour (for speech):
1. When user moves to a new line the entire line should be presented.
2. when user moves to a new cell (in same line) the header and the curent
cell should be presented.
3. When user checks, expands etc a cell the new state should be presented.

4. When user moves to the table header for first time the entire htable
header should be presented.
5. When user moves to a new column header only the new header should be
presented.