Tamil99 keyboard layout is layout standardised by the Government of Tamil nadu vide its order G.O.Ms.No.17 - dated: 13 June 1999 (ref: http://tamilelibrary.org/teli/tnstd.html). The order clearly mentions the Tamil99 Keyboard Sequence for Tamil Unicode (TU). (ref: http://www.tamilvu.org/tkbd/doc_file/Help_windows.pdf ) The unicode key combinations are mentioned in this pdf

The keyboard layout is known for its easiness to type in tamil very fast. Wikimedia did a commendable job by implementing tamil99 keyboard layout in ULS. But the implementation is not full. There are some discrepancies in implementation of certain key combinations. In some cases the key combinations are not implemented.

in this figure the keyboard from shift z to shift s is implemented. From shift g to shift n is not implemented or wrongly implemented.

shift i shift ' is not implemented or wrongly implemented in tamil99 keyboard layout

none of the keyboard combinations in this is implemented in tamil99 keyboard layout

none of the keyboard combinations in this is also not implemented in tamil99 keyboard layout.

It is very essential for the full implementation of tamil99 keyboard layout as specified by the government for the growth of Tamil wiki pages.

Kindly do the needful for the 70 million Tamil speakers around the world.