데브딕에서 지정한 색인용 자료 타입
@font-face 앳룰(at-rules)의 구문 형식을 나타낸다.
@font-face { font-family: <family-name>; src: [<src>]#; [font-weight: <font-weight>;]? [font-style: <font-style>;]? [unicode-range: <unicode-range>;]? [font-feature-settings: <'font-feature-settings'>;]? [font-variation-settings: <'font-variation-settings'>;]? [font-named-instance: <font-named-instance>;]? [font-display: <font-display>;]? [font-language-override: <'font-language-override'>;]? [ascent-override: <ascent-override>;]? [descent-override: <descent-override>;]? [line-gap-override: <line-gap-override>;]?}