https://bugzilla.gnome.org/show_bug.cgi?id=545510
--- Comment #10 from Krasnaya Ploshchad shanshandehongxing@outlook.com --- (In reply to Krasnaya Ploshchad from comment #9)
There is also providing a concise list to describe the usage of these features, all of them should be impelemented:
Sorry, I have no noticed that this bug got resolved as comment 8 mentioned.
fonts-bugs@lists.fedoraproject.org