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CSS: ConceptCSS 的核心概念。
我在 LicidChart 上做了这张 图表，展示了最核心的概念：
RuleSet 也经常被叫作 Rule。At-rule 中的每个 indentifier 都有自己的 syntax，并不是太通用。At-rule 中内容，可能是跟实际 styling 无关的 descriptor，比如 @font-face 中指定字体名用的 font-family；也可能是跟 styling 有关的 declaration。
CSS: ConceptCSS: ConceptCSS 的核心概念。
我在 LicidChart 上做了这张 图表，展示了最核心的概念：
RuleSet 也经常被叫作 Rule。At-rule 中的每个 indentifier 都有自己的 syntax，并不是太通用。At-rule 中内容，可能是跟实际 styling 无关的 descriptor，比如 @font-face 中指定字体名用的 font-family；也可能是跟 styling 有关的 declaration。