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CSS: Concept大部分情况下你都不应该用 !important。这会让你的样式混乱且难调试。MDN 总结出了这些规则：
- Always look for a way to use specificity before even considering
!important - Only use
!importanton page-specific CSS that overrides foreign CSS (from external libraries, like Bootstrap or normalize.css). - Never use
!importantwhen you're writing a plugin/mashup. - Never use
!importanton site-wide CSS.
带 !important 的 declaration 的 specificity 会高于不带的。如果多个 !important 属性冲突，会优先使用 specificity 高的；如果 specificity 一致，会优先选择后声明的。