HTMLSelectElement.checkValidity()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2018.
HTMLSelectElement.checkValidity() 方法會檢查元素是否有任何的檢核、驗證條件，並且檢查是否滿足這些條件。如果元素沒有通過這些檢核，瀏覽器會於該元素上觸發一個可取消的 invalid 事件，並回傳 false。
語法
js
var result = selectElt.checkValidity();
規範
| Specification |
|---|
| HTML # dom-cva-checkvalidity-dev |