關於「Input required」標籤，搜尋引擎有相關的訊息討論：

Make directive @Input required - angular - Stack Overflowstackoverflow.com › questions › make-directive-input-req...HTML attribute: required - HTML: HyperText Markup Language | MDNdeveloper.mozilla.org › References › HTML › Attributes[HTML] - How to make a required form input w