HTMLSelectElement.setCustomValidity()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
HTMLSelectElement.setCustomValidity() 方法可為指定的元素設定自定義檢核訊息。使用空字串表示元素沒有發生違反自定檢核條件的錯誤。