The current implementation only selects the provided script tag, but the OpenType specification defines a fallback mechanism. The relevant paragraph from Common Table Formats is following.
An application should use a DFLT script table if there is not a script table associated with the specific script of the text being formatted, or if the text does not have a specific script (for example, it contains only symbols or punctuation).
mta452
commented
5 years ago
The current implementation only selects the provided script tag, but the OpenType specification defines a fallback mechanism. The relevant paragraph from Common Table Formats is following.
An application should use a DFLT script table if there is not a script table associated with the specific script of the text being formatted, or if the text does not have a specific script (for example, it contains only symbols or punctuation).