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CSS 速成 (4)

用于CSS属性定义的语法

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<Foo>
Foo类型的值. 共同类型的讨论在单位章节.
Foo
必须原文出现的关键字 (尽管无须限制大小写). 逗号和斜杠也必须原文出现.
A B C
A 必须存在, 然后是B, 然后是C, 需要按照顺序.
A | B
A 或B 必须存在.
A || B
A 或B或两者必须存在, 顺序随意.
[ Foo ]
用括号将项目归类在一起.
Foo*
Foo被重复使用零或更多的次数.
Foo+
Foo被重复使用一或更多的次数.
Foo?
Foo为可选.
Foo{A,B}
Foo必须存在最少A次,最多B次.

 

 
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