Gets a command to move the cursor backwards and erase characters in a selected range.
readonly backspace: BackspaceCommand
An object that provides methods that execute the command and check its state.
To delete fields and tables using this command, they should be selected completely.
To delete table elements, use the corresponding methods (RichEditCommands.deleteTable, RichEditCommands.deleteTableCellsWithShiftHorizontally, RichEditCommands.deleteTableCellsWithShiftVertically).