Special features intended for all scripts

Legend of substitution and positioning codes

Below are listed the OpenType lookup table types, as used in the "type" column in the above tables. S stands for substitution, and P stands for positioning. Note that often a feature can be implemented by more than one type of table, and that sometimes the specification fails to explicitly indicate the table type.

AAT typographic features

Features that take one value, mutual exclusive from the rest:

* Annotation

1.Previous
3.Next