關於「HTML input required」標籤，搜尋引擎有相關的訊息討論：

HTML attribute: required - HTML: HyperText Markup Language | MDNdeveloper.mozilla.org › References › HTML › AttributesHow do you use the html input required attribute to make one of a ...stackoverflow.com › questions › how-do-you-use-the-html...[HTML] - How does the required at