仕様書

[2] RFC 8081 - The "font" Top-Level Media Type (2017-03-01 12:40:02 +09:00) https://tools.ietf.org/html/rfc8081#section-4.3
[3] RFC 8081 - The "font" Top-Level Media Type (2017-03-01 12:40:02 +09:00) https://tools.ietf.org/html/rfc8081#section-4.4.1
[1] RFC 8081 - The "font" Top-Level Media Type (2017-03-01 12:40:02 +09:00) https://tools.ietf.org/html/rfc8081#section-4.4.2