串接是指当不同样式表中对相同属性有不同定义时，应该要用哪一个样式表中的定义的规则。
Cascade refers to the rules to determine which property gets applied when a property is declared multiple times in the different style sheets.
串接是指当不同样式表中对相同属性有不同定义时，应该要用哪一个样式表中的定义的规则。
Cascade refers to the rules to determine which property gets applied when a property is declared multiple times in the different style sheets.
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