sort activated via keypress and an "unsort" rule
I can add keyboard focusability to the columns in the heading row by
setting tabindex="0". Once focused, however, no keypress will activate
the sorting functionality.
For keyboard-only users, having the ability to sort via a spacebar or
enter keypress would be great. It would also be nice to be able to
"shift-enter" or "shift-space" to maintain the sort, so that we can
have multiple column sorting available to the keyboard.
Also, there should probably be a "three-click/-keypress" unsort rule:
First click, sort ascending. Second click, sort descending. Third
click, unsort.
Best,
ken