CSS Rule、Selector、Declaration 与 Property / Value | CSS
本章覆盖：rule set；selector；declaration block；property；value；declaration；semicolon；comments；CSS whitespace；invalid declaration 的浏览器容错；unknown property / invalid value 的忽略机制；“某条 CSS 没生效”首先区分未匹配与声明无效。
本章知识点
- rule set
- selector
- declaration block
- property
- value
- declaration
- semicolon
- comments
- CSS whitespace
- invalid declaration 的浏览器容错
- unknown property / invalid value 的忽略机制
- “某条 CSS 没生效”首先区分未匹配与声明无效