题目内容

请简要概括什么是CSS的层叠性、继承性和重要性？

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下列选项中，作为action属性取值正确的是（）

A. 绝对路径
B. 相对路径
C. none
D. 接收数据的E-mail邮箱地址

下列选项中，属于标签的常用属性的是（）多选

A. type
B. name
C. value
D. size

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