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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>