下列选项中，用于指定输入框中的内容是必须填写的input属性是（）

A. required属性
B. autofocus属性
C. multiple属性
D. autocomplete属性

下列选项中，用于指定页面加载后是否自动获取焦点的input属性是（）

A. form属性
B. autofocus属性
C. multiple属性
D. autocomplete属性

下列选项中，属于标记常用属性的是（）

A. size
B. multiple
C. selected
D. value

下列选项中，属于keygen元素的属性有（）

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

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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