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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() 方法將選擇元素的自訂有效性訊息設定為指定的訊息。使用空字串來表示該元素沒有自訂有效性錯誤。
包含錯誤訊息的字串。空字串會移除任何自訂有效性錯誤。
無（undefined）。
| HTML # dom-cva-setcustomvalidity-dev |
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This page was last modified on 2026年1月5日 by MDN contributors.
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