题目内容

下列选项中，属于keygen元素的属性有（）

A. autofocus
B. challenge
C. disabled
D. form

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下列选项中，属于action属性值的有（）

A. 相对路径
B. 绝对路径
C. 接收数据的E-mail邮箱地址
D. 提示信息

下列选项中，可以构成表单的基本元素是（）

A. 表单控件
B. 提示信息
C. 表单域
D. 文本域

下列选项中，属于output元素常用属性的有（）

A. autofocus
B. form
C. name
D. for

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