* 仕様書

[REFS[
- [1] [CITE@en[RFC 8081 - The "font" Top-Level Media Type]] ([TIME[2017-03-01 12:40:02 +09:00]]) <https://tools.ietf.org/html/rfc8081#section-4.3>
- [2] [CITE@en[RFC 8081 - The "font" Top-Level Media Type]] ([TIME[2017-03-01 12:40:02 +09:00]]) <https://tools.ietf.org/html/rfc8081#section-4.4.1>
- [3] [CITE@en[RFC 8081 - The "font" Top-Level Media Type]] ([TIME[2017-03-01 12:40:02 +09:00]]) <https://tools.ietf.org/html/rfc8081#section-4.4.3>
- [4] [CITE@en[RFC 8081 - The "font" Top-Level Media Type]] ([TIME[2017-03-01 12:40:02 +09:00]]) <https://tools.ietf.org/html/rfc8081#section-4.4.4>
]REFS]