/usr/lib/rpm/fileattrs/font.attr is in rpm 4.11.3-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | %__font_provides %{_rpmconfigdir}/fontconfig.prov
%__font_requires %{nil}
%__font_magic [Ff]ont?( (program|collection))?( (text|data))
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