Fetches a list of feature variations in the specified face's GSUB table or GPOS table, at the specified variation coordinates.
| face |
Face to work upon |
| table_tag |
|
| coords |
The variation coordinates to query |
| num_coords |
The number of variation coordinates |
| variations_index |
The array of feature variations found for the query |
|
`true` if feature variations were found, `false` otherwise. |