验证的DOM支持，为表单元素增加了validity属性和新的invalid事件。

DOM support for validity, with a validity attribute for form elements, and a new invalid event.

youdao

验证的DOM支持，为表单元素增加了validity属性和新的invalid事件。

DOM support for validity, with a validity attribute for form elements, and a new invalid event.

youdao