【单选题】【消耗次数：1】
在HTML5中，哪个属性用于规定输入字段是必填的？?（?????）
①
validate
②
formvalidate
③
required
④
placeholder
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相关题目
【单选题】
在?HTML5?中，哪个属性用于规定输入字段是必填的？?（?????）
①
validate
②
formvalidate
③
required
④
placeholder
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