- display table cell cursor like Excel. User can move cursor by mouse or keyboad ( ARROW ).
- range selection like Excel (mouse drag or shift+ARROW , ESC to deselect).
- user can copy range values to Excel (ctrl+C).
- user can paste range values from Excel (ctrl+V).
- user can edit cell value (ENTER,F2, or direct input for example a).
- user can drag to resize column or row.
- easy to extend.
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