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HTML5表单中input元素的()属性为true则规定该域必须在提交之前填写（不能为空）。

A、autofocus

B、autocomplete

C、placeholder

D、required

时间：2021-09-06 21:32 关键词：暨南大学广东开放大学 20年春季期末考试 HTML5开发技术

答案解析

D

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